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BEGIN:VEVENT
SUMMARY:Resummation in Heavy Quarkonium Production
DTSTART;VALUE=DATE-TIME:20191126T090000Z
DTEND;VALUE=DATE-TIME:20191126T092000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-101346@agenda.infn.it
DESCRIPTION:Speakers: Hee Sok Chung (Technical University of Munich)\nWe d
iscuss resummation of large logarithms in heavy quarkonium production cros
s sections. Due to the nonrelativistic nature of heavy quarkonium states\,
nonperturbative matrix elements of heavy quarkonia can involve singular d
istributions. In such cases\, standard methods of solving evolution equati
ons can lead to nonconverging integrals or series. We discuss methods to o
vercome these difficulties and obtain resummed cross sections in heavy qua
rkonium inclusive and exclusive production processes.\n\nhttps://agenda.in
fn.it/event/17749/contributions/101346/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/101346/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wilson-line geometries and the relation between IR singularities o
f form factors and the large-x limit of DGLAP splitting functions
DTSTART;VALUE=DATE-TIME:20191129T093000Z
DTEND;VALUE=DATE-TIME:20191129T095000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-101491@agenda.infn.it
DESCRIPTION:Speakers: Calum Milloy (University of Edinburgh)\nWe discuss t
he relation between the infrared singularities of on-shell partonic form f
actors and parton distribution functions (PDFs) near the elastic limit\, t
hrough their factorisation in terms of Wilson-line correlators. Ultimately
we identify the difference between the anomalous dimension controlling si
ngle poles of these two quantities to all loops in terms of the closed par
allelogram Wilson loop. To arrive at this result we first use the common h
ard-collinear behaviour of the two to derive a relation between their resp
ective non-collinear soft singularities\, and then show that the latter is
manifested in terms of differing Wilson-line geometries. We use explicit
diagrammatic calculations in configuration space through two loops to veri
fy the relation. More generally\, the emerging picture allows us to classi
fy collinear singularities in eikonal quantities depending on whether they
are associated with finite (closed) Wilson-line segments or infinite (ope
n) ones.\n\nhttps://agenda.infn.it/event/17749/contributions/101491/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/101491/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Using Jets for TMD search
DTSTART;VALUE=DATE-TIME:20191128T110000Z
DTEND;VALUE=DATE-TIME:20191128T112000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-101669@agenda.infn.it
DESCRIPTION:Speakers: Ignazio Scimemi (Universidad Complutense Madrid)\nJe
t technics have been used and developed for a while at LHC. I will discuss
the compatibility of jet definition with the TMD factorization theorem an
d how they can be used in TMD investigations.\n\nhttps://agenda.infn.it/ev
ent/17749/contributions/101669/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/101669/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Small-x resummation and its impact in PDF determination
DTSTART;VALUE=DATE-TIME:20191129T083000Z
DTEND;VALUE=DATE-TIME:20191129T085000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-101838@agenda.infn.it
DESCRIPTION:Speakers: Marco Bonvini (ROMA1)\nI will consider the resummati
on of logarithms of the momentum scaling variable x\, which become large a
t small momentum fractions\, namely at high energies. I will cover recent
developments in the field\, which led to the first PDF fits including smal
l-x resummation. I will discuss the effects on PDF determination\, and the
implications for present and future collider phenomenology.\n\nhttps://ag
enda.infn.it/event/17749/contributions/101838/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/101838/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shockwaves\, TMD distributions and BFKL
DTSTART;VALUE=DATE-TIME:20191128T163000Z
DTEND;VALUE=DATE-TIME:20191128T165000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-103052@agenda.infn.it
DESCRIPTION:Speakers: Renaud Boussarie (Brookhaven National Lab)\nI will d
iscuss the continuity between small x physics and moderate x physics by sh
owing how semiclassical descriptions of small x amplitudes can be fully re
written in terms of TMD distributions.\nWith this equivalence in mind\, I
will reinterpret saturation models in terms of these distributions.\n\nhtt
ps://agenda.infn.it/event/17749/contributions/103052/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/103052/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phenomenology of Sudakov Resummation in the CGC Framework
DTSTART;VALUE=DATE-TIME:20191128T140000Z
DTEND;VALUE=DATE-TIME:20191128T142000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-103550@agenda.infn.it
DESCRIPTION:Speakers: Shu-yi Wei (ECT*)\nWe calculate and compare the diff
erential cross sections for forward $Z^0$-boson production at small transv
erse momentum\, in proton-proton and proton-nucleus collisions\, using bot
h the collinear and dilute-dense factorization frameworks. In both cases\,
we implement a Sudakov resummation of the large logarithms generated by s
oft-gluon emissions\, which is essential in order to describe the transver
se momentum distribution of forward $Z^0$ bosons measured at the Tevatron
and the LHC. We further compute the nuclear modification factor in the dil
ute-dense framework\, hoping to single out signals of saturation effects a
t small values of $x$. Our predictions are compared with those obtained in
the collinear factorization framework\, using two different nuclear parto
n distribution functions.\n\narXiv:1909.08572\n\nhttps://agenda.infn.it/ev
ent/17749/contributions/103550/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/103550/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$Z$ boson production in proton-lead collisions at the LHC accounti
ng for transverse momenta of initial partons
DTSTART;VALUE=DATE-TIME:20191126T143000Z
DTEND;VALUE=DATE-TIME:20191126T145000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-100778@agenda.infn.it
DESCRIPTION:Speakers: Etienne Blanco (IFJ PAN)\nWe perform a calculation o
f inclusive $Z$ boson production in proton-lead collisions at the LHC taki
ng into account the transverse momenta of the initial partons. We use the
framework of $k_T$-factorization combining transverse momentum dependent p
arton distributions (TMDs) with off-shell matrix elements. In order to do
it we need to construct appropriate TMDs for lead nuclei which is done usi
ng the parton branching method. Our computations are compared with data fr
om CMS taken at $\\sqrt{s}=5.02$ TeV. The results are in good agreement wi
th the measurements especially the transverse momentum distribution of the
$Z$ boson.\n\nhttps://agenda.infn.it/event/17749/contributions/100778/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/100778/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parton shower based on TMD parton distributions
DTSTART;VALUE=DATE-TIME:20191125T164000Z
DTEND;VALUE=DATE-TIME:20191125T170000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-100776@agenda.infn.it
DESCRIPTION:Speakers: Melanie Schmitz (DESY)\nWe present a parton shower b
ased on Transverse Momentum Dependent (TMD)\nparton distributions obtained
with the Parton Branching method. We investigate\nhow well the TMD parton
shower reproduces the TMD parton distributions. \nApplications of the TMD
parton shower to LHC processes will be presented.\n\nhttps://agenda.infn.
it/event/17749/contributions/100776/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/100776/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matching NLO with Paton Branching TMD's on inclusive Z and bbbar p
roduction
DTSTART;VALUE=DATE-TIME:20191125T161000Z
DTEND;VALUE=DATE-TIME:20191125T163000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104467@agenda.infn.it
DESCRIPTION:Speakers: Luis Ignacio Estevez Banos (DESY)\nWe present NLO pr
edictions from Powheg (POWHEG_BOX_V2) and MC@NLO merged with Parton Branch
ing TMD's for inclusive Z and bbar production. We compare predictions for
range of mass 60 \n\nhttps://agenda.infn.it/event/17749/contributions/104
467/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104467/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Photoproduction of three jets in TMD factorization from the CGC
DTSTART;VALUE=DATE-TIME:20191128T133000Z
DTEND;VALUE=DATE-TIME:20191128T135000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104468@agenda.infn.it
DESCRIPTION:Speakers: Pieter Maria Taels (Istituto Nazionale di Fisica Nuc
leare)\nIn this work\, we investigate the photoproduction of three jets at
low-x. We calculate the cross section using the Color Glass Condensate (C
GC) effective theory\, allowing us to resum the multiple scattering of the
hard partons off the dense semi-classical gluon fields in the highly boos
ted proton or nucleus. In the so-called correlation limit\, in which the s
um q_T of the transverse momenta of the jets is smaller than each of the i
ndividual momenta K_T\, the result can be expanded in the small parameter
q_T/K_T and one recovers a (leading-order) TMD factorized expression. This
expression consists of the same hard parts one would obtain in a TMD calc
ulation\, convolved with what we show are the unpolarized and linearly pol
arized Weizsäcker-Williams gluon TMDs. We show model predictions for the
cross section\, ways to disentangle the TMDs with the help of azimuthal mo
menta\, and elaborate on the future outlook.\n\nhttps://agenda.infn.it/eve
nt/17749/contributions/104468/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104468/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Production of Z-boson in parton branching method
DTSTART;VALUE=DATE-TIME:20191125T141000Z
DTEND;VALUE=DATE-TIME:20191125T143000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104469@agenda.infn.it
DESCRIPTION:Speakers: QUN WANG (DESY - PKU)\nTransverse Momentum Dependent
(TMD) parton distributions obtained from the Parton Branching (PB) method
are combined with next-to-leading-order (NLO) calculations of Drell-Yan (
DY) production. MC@NLO method is used for the hard process calculation and
match with the PB TMDs. The predictions of the transverse momentum\, rap
idty and $\\phi^*$ spectra of Z boson have been computed. The theoretical
predictions agree well with measurements at the Large Hadron Collider (LHC
) within uncertainties. In particular\, we study the region of lowest tran
sverse momenta at the LHC\, and comment on its sensitivity to nonperturbat
ive TMD contributions.\n\nhttps://agenda.infn.it/event/17749/contributions
/104469/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104469/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diffractive leptoproduction of $\\rho$ and $\\phi$ light vector me
sons via small-x unintegrated gluon density
DTSTART;VALUE=DATE-TIME:20191126T133000Z
DTEND;VALUE=DATE-TIME:20191126T135000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104660@agenda.infn.it
DESCRIPTION:Speakers: Andrèe Dafne Bolognino (Università della Calabria
& INFN-Cosenza)\nThe unintegrated gluon distribution (UGD) provides the de
scription of the gluon content in the proton in the high-energy regime and
it is formulated in $\\kappa_T$-factorization approach. In this theoretic
al framework\, the helicity amplitude is a convolution of the UGD in the p
roton with the impact factor\, which depends on the considered process and
where the structure of the meson is encoded by distribution amplitude (DA
).\nWe apply $\\kappa_T$-factorization approach\, exploiting two different
UGD models\, in order to give predictions for polarized cross sections $\
\sigma_L$ and $\\sigma_T$ of two interesting channels: the leptoproduction
of $\\rho$ and $\\phi$ mesons. We compare results with H1 and ZEUS measur
ements.\n\nhttps://agenda.infn.it/event/17749/contributions/104660/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104660/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multi-jet merging in the parton branching method
DTSTART;VALUE=DATE-TIME:20191125T154000Z
DTEND;VALUE=DATE-TIME:20191125T160000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104661@agenda.infn.it
DESCRIPTION:Speakers: Armando Bermudez Martinez (DESY)\nTransverse Momentu
m Dependent parton distributions obtained from the Parton Branching method
are combined with leading-order calculations of Drell-Yan production with
up to three partons in the final state. A modified version of the MLM mer
ging algorithm is applied in order to remove double counting from the diff
erent jet multiplicities. The merging is tested using the differential jet
rate plots and the merging uncertainty is estimated by varying the mergin
g scale. Final predictions for the inclusive Z pt distribution are compare
d to the data as well as to the NLO calculations obtained with the MC@NLO
method.\n\nhttps://agenda.infn.it/event/17749/contributions/104661/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104661/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dynamical resolution scale in transverse momentum distributions at
the LHC
DTSTART;VALUE=DATE-TIME:20191125T144000Z
DTEND;VALUE=DATE-TIME:20191125T150000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104662@agenda.infn.it
DESCRIPTION:Speakers: Mees van Kampen (Universiteit Antwerpen)\nThe QCD ev
olution of transverse momentum dependent (TMD) distribution functions has
recently been formulated in a parton branching (PB) formalism. In this app
roach\, soft-gluon coherence effects are taken into account by introducing
the soft-gluon resolution scale and exploiting the relation between tran
sverse-momentum recoils and branching scales. In this talk we investigate
the implications of dynamical\, i.e.\, branching scale dependent\, resolut
ion scales. \nWe present both analytical studies and numerical solution of
PB evolution equations in the presence of dynamical resolution scales. \n
We use this to compare PB results with other approaches in the literature\
, and to analyze predictions for transverse momentum distributions in $Z$
-boson production at the Large Hadron Collider (LHC).\n\nhttps://agenda.in
fn.it/event/17749/contributions/104662/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104662/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Azimuthal asymmetries in SIDIS and Drell-Yan processes: from high
to low transverse momentum
DTSTART;VALUE=DATE-TIME:20191128T080000Z
DTEND;VALUE=DATE-TIME:20191128T082000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104793@agenda.infn.it
DESCRIPTION:Speakers: Cristian Pisano (CA)\nWe consider the azimuthal dist
ribution of the final observed hadron in semi-inclusive deep-inelastic sca
ttering and the lepton pair in the Drell-Yan process. In particular\, we f
ocus on the cosϕ modulation of the unpolarized cross section and on its d
ependence upon transverse momentum. At low transverse momentum\, for these
observables we propose a factorized expression based on tree-level approa
ch and conjecture that the same formula is valid in transverse-momentum de
pendent (TMD) factorization when written in terms of subtracted TMD parton
distributions. Our formula correctly matches with the collinear factoriza
tion results at high transverse momentum\, solves a long-standing problem
and is a necessary step towards the extension of the TMD factorization the
orems up to the subleading twist.\n\nhttps://agenda.infn.it/event/17749/co
ntributions/104793/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104793/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Single-spin asymmetries in $p^\\uparrow p\\rightarrow J/\\psi$ col
lision within a TMD approach
DTSTART;VALUE=DATE-TIME:20191126T083000Z
DTEND;VALUE=DATE-TIME:20191126T085000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104794@agenda.infn.it
DESCRIPTION:Speakers: Rajesh Sangem (Istituto Nazionale di Fisica Nucleare
)\nQuarkonium production has been advertised as a tool to probe the gluon
TMDs. Among the eight gluon TMDs\, gluon Sivers function has been receivi
ng paramount of interest both theoretically and experimentally. We study t
he single-spin asymmetry (SSA) in proton-proton collision process in $J/\\
psi$ production by employing the generalized parton model (GPM)\, and comp
are SSA with PHENIX data. We discuss how the singularities coming from col
or octet states can be cured in a simple way\, which leads to finite cross
section in the low-$p_T$ region.\n\nhttps://agenda.infn.it/event/17749/co
ntributions/104794/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104794/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prompt hadroproduction of pseudoscalar charmonia in the k_T factor
ization approach
DTSTART;VALUE=DATE-TIME:20191126T103000Z
DTEND;VALUE=DATE-TIME:20191126T105000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104795@agenda.infn.it
DESCRIPTION:Speakers: Wolfgang Schaefer (Institute of Nuclear Physics PAN)
\nWe present our recent calculations on the production of pseudoscalar cha
rmonia eta_c(1S) and eta_c(2S) in the k_T factorization approach. We discu
ss the regions of longitudinal and transverse momenta of gluons probed in
the kinematics of the LHCb or ATLAS experiments.\nThe crucial ingredient i
s the off-shell matrix element\, which in this case is\nrelated to a g^*g^
*eta_c form factor. Its calculation proceeds analogously to the gamma^* ga
mma^* eta_c form factor obtained in terms of the light front wave function
of the charmonium in [1]. \nWe compare our results to recent LHCb data an
d discuss the sensitivity\nto the choice of the unintegrated gluon distrib
ution.\n\n[1] I.~Babiarz\, V.~P.~Goncalves\, R.~Pasechnik\, W.~Schäfer
and A.~Szczurek\,\n Phys. Rev. D 100 (2019) no.5\, 054018\n\nhttps://age
nda.infn.it/event/17749/contributions/104795/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104795/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TMD splitting functions in kT-factorization and prospects for usin
g them in the evaluation of TMD distribution functions
DTSTART;VALUE=DATE-TIME:20191125T171000Z
DTEND;VALUE=DATE-TIME:20191125T173000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104796@agenda.infn.it
DESCRIPTION:Speakers: Lissa Keersmaekers (University of Antwerp)\nWe prese
nt an overview of the calculation of transverse momentum dependent (TMD) r
eal emission contributions to splitting functions within kT-factorization.
We discuss their properties\, such as the limits in which they reduce to
well known kernels.\n\nWe present an implementation of the splitting funct
ions in a Monte Carlo simulation\, based on the Parton Branching method. R
esults of TMD distribution functions from this implementation are shown.\n
\nhttps://agenda.infn.it/event/17749/contributions/104796/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104796/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The impact of the non-perturbative parameters in the PB method on
the predictions for low energy DY measurements
DTSTART;VALUE=DATE-TIME:20191127T140000Z
DTEND;VALUE=DATE-TIME:20191127T142000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104770@agenda.infn.it
DESCRIPTION:Speakers: Aleksandra Lelek (UAntwerp)\nThe PB TMDs were succes
sfully used for obtaining predictions for LHC measurements. However\, thes
e measurements turned out to not be sensitive to some of the non-perturbat
ive parameters existing in the PB approach. In this talk we show prelimina
ry results for the application of PB TMDs to low energy DY data. We illus
trate the role of non-perturbative dynamics\, including intrinsic transver
se momentum and soft-gluon resolution scale\, in the PB TMDs\, and we disc
uss their impact on phenomenological predictions.\n\nhttps://agenda.infn.i
t/event/17749/contributions/104770/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104770/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joint Higgs and jet transverse-momentum resummation in direct spac
e
DTSTART;VALUE=DATE-TIME:20191127T110000Z
DTEND;VALUE=DATE-TIME:20191127T112000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104802@agenda.infn.it
DESCRIPTION:Speakers: Paolo Torrielli (Istituto Nazionale di Fisica Nuclea
re)\nI present recent developments in the direct-space resummation of tran
sverse observables in colour-singlet production in the RadISH framework\,
with particular focus on the NNLL joint resummation for the transverse mom
entum of the Higgs boson and of the leading jet in gluon fusion at the LHC
.\n\nhttps://agenda.infn.it/event/17749/contributions/104802/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104802/
END:VEVENT
BEGIN:VEVENT
SUMMARY:BFKL resummation in heavy-quark pair hadroproduction
DTSTART;VALUE=DATE-TIME:20191128T143000Z
DTEND;VALUE=DATE-TIME:20191128T145000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104771@agenda.infn.it
DESCRIPTION:Speakers: Michael Fucilla (Università della Calabria)\nWe con
sider the inclusive production in proton-proton collisions of two heavy qu
arks\, separated by a large rapidity interval\, that can be experimentally
investigated at the Large Hadron Collider (LHC) to test QCD predictions i
n the semi-hard regime. The process is studied in the Regge kinematical re
gion by the Balistky-Fadin-Kuraev-Lipatov (BFKL) approach. A full resummat
ion of leading energy logarithms and a partial resummation of the next-to-
leading ones are performed. Predictions for the cross section summed over
the azimuthal angles and for azimuthal correlations are presented.\n\nhttp
s://agenda.infn.it/event/17749/contributions/104771/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104771/
END:VEVENT
BEGIN:VEVENT
SUMMARY:NNLL resummations with ARES
DTSTART;VALUE=DATE-TIME:20191127T103000Z
DTEND;VALUE=DATE-TIME:20191127T105000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104803@agenda.infn.it
DESCRIPTION:Speakers: Andrea Banfi (University of Sussex)\nI present the A
RES method for the resummation of final-state observables at NNLL accuracy
. I discuss the main feature of the method\, and the most important result
s obtained with it. I will then present its most recent developments.\n\nh
ttps://agenda.infn.it/event/17749/contributions/104803/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104803/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An EFT approach to quarkonium at small transverse momentum
DTSTART;VALUE=DATE-TIME:20191126T093000Z
DTEND;VALUE=DATE-TIME:20191126T095000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-100775@agenda.infn.it
DESCRIPTION:Speakers: Yiannis Makris ()\nIn this work we apply effective f
ield theory (EFT) to observables in quarkonium production and decay that a
re sensitive to soft gluon radiation\, in particular measurement that are
sensitive to small transverse momentum. Within the EFT framework we study
$\\chi_{Q}$ decay to light quarks followed by the fragmentation of those
quarks to light hadrons and derive a factorization theorem that involves t
he un-subtracted transverse momentum distributions (TMDs) and quarkonium T
MD shape functions. We derive renormalization group equations\, both in ra
pidity and virtuality\, which are used to evolve the different terms in th
e factorization theorem and resum large logarithms. This theoretical frame
work will provide a systematic treatment of quarkonium production and deca
y processes in TMD sensitive measurements\n\nhttps://agenda.infn.it/event/
17749/contributions/100775/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/100775/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy-quark production with kt-factorization: The importance of th
e sea-quark distribution
DTSTART;VALUE=DATE-TIME:20191126T140000Z
DTEND;VALUE=DATE-TIME:20191126T142000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-100773@agenda.infn.it
DESCRIPTION:Speakers: Benjamin Guiot (Universidad federico santa maria)\nH
eavy-quark production is of first importance at the LHC\, allowing to test
factorization formulas\, and to probe cold and hot nuclear matter. In the
first part of the presentation\, I will quickly review heavy-quark produc
tion in the case of the collinear factorization\, making some useful remar
ks for the second part of the talk. Then\, I will switch to heavy-quark pr
oduction with kt-factorization. The main goal is to discuss the fact that
present calculations take into account only the gluon-gluon contribution.
I will show that\, in fact\, in the case of a variable-flavor-number schem
e (commonly used at the LHC)\, the main contribution is given by the $Qg\\
rightarrow Qg$ contribution. The most interesting part is the answer to th
e following question: Why current studies are in agreement with data if th
ey neglect the main contribution? We will see that the answer is not uniqu
e. (This work has been published in PRD 99\, 074006).\n\nhttps://agenda.in
fn.it/event/17749/contributions/100773/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/100773/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New developments in the PROSA PDF fit
DTSTART;VALUE=DATE-TIME:20191129T080000Z
DTEND;VALUE=DATE-TIME:20191129T082000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104841@agenda.infn.it
DESCRIPTION:Speakers: Maria Vittoria Garzelli (Universita' degli Studi di
Firenze & Tuebingen Universitaet)\nThe PROSA PDF fit was the first in the
literature showing the impact of the inclusion of open-heavy flavour produ
ction data on low-x gluons. \nWe present a new version of the fit\, includ
ing a more extended set of experimental data than our previous fit\, which
allows to better constrain gluon and sea quark distributions and we show
its performances in applications of interest for neutrino astronomy.\n\nht
tps://agenda.infn.it/event/17749/contributions/104841/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104841/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Building maps of kinematical regions in SIDIS
DTSTART;VALUE=DATE-TIME:20191127T143000Z
DTEND;VALUE=DATE-TIME:20191127T145000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104842@agenda.infn.it
DESCRIPTION:Speakers: Mariaelena Boglione (TO)\nIn a SIDIS process\, in or
der to establish the consistency of a particular hadronic observable with
an estimate of the appropriate underlying partonic picture\, one can intr
oduce some quantitative criteria expressed in terms of various ratios of p
artonic and hadronic momentum degrees of freedom. I will describe how to u
se these criteria in phenomenology and provide a visualization of these ra
tios for some tipical kinematic configurations.\n\nhttps://agenda.infn.it/
event/17749/contributions/104842/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104842/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quasi-TMDPDFs and the Collins-Soper Kernel
DTSTART;VALUE=DATE-TIME:20191128T090000Z
DTEND;VALUE=DATE-TIME:20191128T092000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104943@agenda.infn.it
DESCRIPTION:Speakers: Iain Stewart (MIT)\nIn this talk I will discuss the
concept of quasi-TMDPDFs\, which are transverse momentum dependent parton
distribution functions defined with operators on a spatial (equal-time) sl
ice. These distributions must be defined so that they have the same infra
red physics as the standard TMDPDF\, but can be directly calculated with L
attice QCD. As a nice application\, I discuss our proposal for using latti
ce QCD to obtain non-perturbatively the Collins-Super evolution kernel for
the standard TMDPDF.\n\nhttps://agenda.infn.it/event/17749/contributions/
104943/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104943/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Soft gluon resummation in associated production of top-antitop pai
r and a H\, Z or W boson
DTSTART;VALUE=DATE-TIME:20191127T113000Z
DTEND;VALUE=DATE-TIME:20191127T115000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105038@agenda.infn.it
DESCRIPTION:Speakers: Leszek Motyka (Jagiellonian University)\nSoft gluon
resummation for associated t-tbar pair and a H\, Z or W boson is performed
up to the NNLL accuracy in QCD. The results are matched to the NLO QCD an
d calculations. The total hadroproduction cross sections at the LHC are ob
tained as well as selected kinematical distributions. It is shown that the
resummation leads to higher theoretical precision. Results are compared t
o data from the LHC.\n\nhttps://agenda.infn.it/event/17749/contributions/1
05038/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105038/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Electron-Ion Collider: A facility to bring the era of quantita
tive QCD to maturity
DTSTART;VALUE=DATE-TIME:20191125T131000Z
DTEND;VALUE=DATE-TIME:20191125T133000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104913@agenda.infn.it
DESCRIPTION:Speakers: Christine Aidala (University of Michigan)\nDue to co
nfinement\, much of the richness as well as the challenge of quantum chrom
odynamics lies in relating the partonic degrees of freedom in the fundamen
tal field theory to the hadronic degrees of freedom that we can observe.
Within the context of high-energy QCD\, the ability to factorize short-dis
tance\, perturbatively calculable partonic scattering cross sections from
long-distance functions describing hadron structure or formation\, and the
ability to evolve the long-distance functions measured at one scale in or
der to make predications at a different scale\, have been critical phenome
nological tools for several decades. In the 1990s and early 2000s the dev
elopment of resummation techniques enabled quantitative treatment of a var
iety of multiscale observables. As an extremely versatile next-generation
facility for the study of QCD\, the Electron-Ion Collider promises to bri
ng the era of quantitative QCD to maturity\, prompting the community to pu
sh the limits of applicability of current theoretical ideas\, and inspirin
g new ones. Prospects for various types of physics measurements at the EI
C will be discussed.\n\nhttps://agenda.infn.it/event/17749/contributions/1
04913/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104913/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prospects for measurements of H/Z production cross section ra-tios
using CMS Run II data
DTSTART;VALUE=DATE-TIME:20191127T080000Z
DTEND;VALUE=DATE-TIME:20191127T082000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105039@agenda.infn.it
DESCRIPTION:Speakers: Louis Moureaux (IIHE-ULB)\nWe present prospects for
the direct measurement of ratios of differential cross sections for the pr
oduction of Z and Higgs bosons in proton-proton collisions\, using data ta
ken by CMS during the LHC Run II. The aim of the measurement is to study s
oft and hard gluon emission in the initial statefor Higgs and Z production
mechanisms. Hence\, we focus on variables known to be sensitive to the pr
oduction mechanisms of heavy bosons: jet multiplicity\, transverse momenta
of the boson andleading jet\, and momentum balance in the transverse plan
e. We use Monte-Carlo samples to study the feasibility of the measurement
and estimate the expected precision.\n\nhttps://agenda.infn.it/event/17749
/contributions/105039/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105039/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extraction of TMDs from Drell-Yan data
DTSTART;VALUE=DATE-TIME:20191127T153000Z
DTEND;VALUE=DATE-TIME:20191127T155000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105133@agenda.infn.it
DESCRIPTION:Speakers: Chiara Bissolotti (University of Pavia and INFN)\nWe
present an extraction of unpolarized transverse-momentum dependent (TMD)
parton distribution functions (PDFs) based on a fit on data from Drell-Yan
processes in different experiments and kinematic ranges\, including in pa
rticular LHC experiments. The analysis is performed in the TMD factorizati
on framework with perturbative accuracy up to next-to-next-to-next-to-lead
ing-log ($N^3LL$)\, obtaining an improvement in the agreement with data.\n
\nhttps://agenda.infn.it/event/17749/contributions/105133/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105133/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quarkonium production measurements as a tool for TMD studies
DTSTART;VALUE=DATE-TIME:20191126T080000Z
DTEND;VALUE=DATE-TIME:20191126T082000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105134@agenda.infn.it
DESCRIPTION:Speakers: Vato Kartvelishvili (Lancaster University)\nAn overv
iew will be given of recent experimental results on quarkonium production
at the LHC\, both inclusive and in association with other particles\, suc
h as W\, Z bosons or another quarkonium. The challenges of making such mea
surements will be highlighted\, and possible applications for extracting g
luon TMDs will be discussed.\n\nhttps://agenda.infn.it/event/17749/contrib
utions/105134/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105134/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The qT-subtraction formalism at N3LO
DTSTART;VALUE=DATE-TIME:20191127T090000Z
DTEND;VALUE=DATE-TIME:20191127T092000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105210@agenda.infn.it
DESCRIPTION:Speakers: Leandro Javier Cieri (Istituto Nazionale di Fisica N
ucleare - Sez. Milano Bicocca)\nIn this talk we will show the necessary in
gredients of a N3LO perturbative QCD calculation using the qT-subtraction
prescription. We will show which are the partially known (or missing) coef
ficients at the third order in the strong coupling and how we can circumve
nt this problem using the total cross section at the same perturbative ord
er. We will apply this formalism to the particular case of Higgs boson pro
duction in the large top-mass limit.\n\nhttps://agenda.infn.it/event/17749
/contributions/105210/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105210/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transversal momentum dependence and production of jets in p-p\, p-
A and A-A
DTSTART;VALUE=DATE-TIME:20191128T113000Z
DTEND;VALUE=DATE-TIME:20191128T115000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105211@agenda.infn.it
DESCRIPTION:Speakers: Krzysztof Kutak (IFJ PAN)\nI am going to present rec
ent results on the broadening phenomenon in p-p\, p-A and A-A collisions.
In p-p and p-A the broadening is described in terms of the ITMD factorizat
ion\, accounting for Sudakov effects and saturation. In A-A it is due to s
oft multiple collisions of the jet traversing the QGP.\n\nhttps://agenda.i
nfn.it/event/17749/contributions/105211/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105211/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parton Reggeization Approach: prompt-J/psi pair production at LHC
and developments towards NLO
DTSTART;VALUE=DATE-TIME:20191126T110000Z
DTEND;VALUE=DATE-TIME:20191126T112000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105212@agenda.infn.it
DESCRIPTION:Speakers: Maxim Nefedov (II Institute for theoretical Physics\
, Uni. Hamburg\; Samara National Research University)\nWe present Parton R
eggeization Approach --the gauge-invariant scheme of kT factorization base
d on Lipatov's gauge-invariant EFT for Multi-Regge processes in QCD.\nAfte
r review of LO formalism\, our recent [1] calculation of inclusive differe
ntial distributions of pairs of prompt J/psi produced in pp-collisions at
the LHC in the framework of LO PRA and NRQCD-factorization formalism will
be presented. To improve description of data in the region of large invari
ant mass (large rapidity separation) of the pair we also study the effects
of BFKL resummation on top of our fixed-order prediction. \nIn the second
part of the talk\, new developments towards NLO calculations in PRA will
be presented\, including techniques of loop calculations including rapidit
y divergences and several scales of virtuality [2].\n\n[1] Phys. Rev. Lett
. 123\, 162002 (2019)\n[2] Nucl.Phys. B946\, 114715 (2019)\n\nhttps://agen
da.infn.it/event/17749/contributions/105212/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105212/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discussion: MCs\, TMDlib\, TMDplotter\, etc
DTSTART;VALUE=DATE-TIME:20191126T163000Z
DTEND;VALUE=DATE-TIME:20191126T171500Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105301@agenda.infn.it
DESCRIPTION:Speakers: Hannes Jung (DESY)\nhttps://agenda.infn.it/event/177
49/contributions/105301/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105301/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discussion: EW WG report\, etc
DTSTART;VALUE=DATE-TIME:20191127T163000Z
DTEND;VALUE=DATE-TIME:20191127T171500Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105297@agenda.infn.it
DESCRIPTION:Speakers: Giuseppe Bozzi (PV)\, Valerio Bertone (Università d
egli studi di Pavia)\nhttps://agenda.infn.it/event/17749/contributions/105
297/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105297/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome
DTSTART;VALUE=DATE-TIME:20191125T130000Z
DTEND;VALUE=DATE-TIME:20191125T131000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105296@agenda.infn.it
DESCRIPTION:Speakers: Miguel Echevarria (INFN Pavia)\nhttps://agenda.infn.
it/event/17749/contributions/105296/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105296/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Registration
DTSTART;VALUE=DATE-TIME:20191125T123000Z
DTEND;VALUE=DATE-TIME:20191125T130000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105300@agenda.infn.it
DESCRIPTION:https://agenda.infn.it/event/17749/contributions/105300/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105300/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Status of General-Purpose Event Generators
DTSTART;VALUE=DATE-TIME:20191125T134000Z
DTEND;VALUE=DATE-TIME:20191125T140000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105716@agenda.infn.it
DESCRIPTION:Speakers: Stefan Prestel (Lund University)\nIn this talk\, I w
ill give an overview of General-Purpose Event Generators for High-Energy p
hysics\, and attempt to highlight their HL-LHC and EIC-relevant aspects\,
such as their hard physics modelling\, QCD and electroweak resummation pro
perties (and recent developments)\, as well as non-perturbative modelling
relevant for TMD physics.\n\nhttps://agenda.infn.it/event/17749/contributi
ons/105716/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105716/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dijet azimuthal correlations in multijet production at high energy
in $k_T-$factorization
DTSTART;VALUE=DATE-TIME:20191126T113000Z
DTEND;VALUE=DATE-TIME:20191126T115000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-101345@agenda.infn.it
DESCRIPTION:Speakers: Vladimir Saleev (Samara National Research University
)\nA new method of consistent merging of jet calculations in $k_T$-factori
zation with higher-order matrix elements is proposed. We study azimuthal c
orrelations between leading and subleading jets in large$-p_T$ multijet pr
oduction with two\, three and four jets in final state within the parton R
eggeization approach (PRA). PRA is based on $k_T-$factorization of hard pr
ocesses in the multi-Regge\nkinematics\, Kimber-Martin-Ryskin unPDFs and L
ipatov's effective theory of Reggeized gluons and quarks. Last one allows
to treat initial-state radiation in a gauge invariant way. As it was shown
earlier in [1] and [2]\, Reggeized amplitudes in PRA totally agree with o
ff-shell amplitudes from the AVHLIB [3] and calculations of hard cross se
ctions use MC generator KaTie [4] with KMR unPDFS [5] should coincide wit
h direct calculations in PRA. We have checked this statement for producti
on of two and three jets. The final calculations have been done with KaTi
e MC event generator. We have obtained a good agreement with CMS data [6]
for azimuthal correlations between leading and subleading jets for events
with more than two\, three and four jets.\n\n\n[1] A.V.Karpishkov\, M.A.N
efedov and V.A.Saleev\,\n $B{\\bar B}$ angular correlations at the LHC in
parton Reggeization approach merged with higher-order matrix elements\,\n
Phys.\\ Rev.\\ D {\\bf 96} (2017) no.9\, 096019.\n\n[2] K.Kutak\, R.Mac
iula\, M.Serino\, A.Szczurek and A.van Hameren\,\n Four-jet production in
single- and double-parton scattering within high-energy factorization\,\n
JHEP {\\bf 1604} (2016) 175.\n\n[3] M. Bury\, A. van Hameren\, Numerical
evaluation of multi-gluon\namplitudes for High Energy Factorization\, Com
put. Phys. Commun. {\\bf\n196} (2015) 592.\n\n[4] A. van Hameren\, KaTie:
For parton-level event generation with\nkT-dependent initial states Publi
shed in Comput.Phys.Commun. 224\n(2018) 371-380\n\n[5] M. A. Kimber\, A. D
. Martin\, and M. G. Ryskin\, Unintegrated\nparton distributions and promp
t photon hadroproduction\, Eur. Phys.\nJ. {\\bf C12} (2000) 655.\n\n[6] A.
M. Sirunyan\, A. Tumasyan\, W. Adam\, et al.\, Azimuthal\ncorrelations for
inclusive 2-jet\, 3-jet\, and 4-jet events in pp\ncollisions at $\\sqrt{
S}=13$ TeV\, Eur. Phys. J. {\\bf C78} (2018)\n566.\n\nhttps://agenda.infn.
it/event/17749/contributions/101345/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/101345/
END:VEVENT
BEGIN:VEVENT
SUMMARY:. Double parton distribution of valence quarks in the pion in ch
iral quark models
DTSTART;VALUE=DATE-TIME:20191126T160000Z
DTEND;VALUE=DATE-TIME:20191126T162000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104904@agenda.infn.it
DESCRIPTION:Speakers: Ruiz Arriola Enrique (Universidad de Granada\, Spain
)\nThe valence double parton distribution of the pion is analyzed in the f
ramework of chiral quark models\, where in the chiral limit factorization
between the longitudinal and transverse degrees of freedom occurs. This fe
ature leads\, at the quark-model scale\, to a particularly simple distribu
tion of the form $D(x_1\,x_2\, \\vect{y}) = \\delta(1-x_1-x_2) F(\\vect{y}
)$\, where x1\,2 are the longitudinal momentum fractions carried the valen
ce quark and antiquark\, and $\\vect{y}$ is the separation of their transv
erse positions. For $\\vect{y}=\\vect{0}$ this result complies immediately
to the Gaunt-Sterling sum rules. The DGLAP evolution to higher scales is
carried out in terms of the Mellin moments. We then explore its role on th
e longitudinal correlation quantified with the ratio of the double distrib
ution to the product of single distributions\, $D(x_1\,x_2\, \\vect{y})/D(
x_1)D(x_2)$. We point out that the ratios of moments ⟨xn1xm2⟩/⟨xn1
⟩⟨xm2⟩ are independent of the evolution\, providing particularly sui
table measures to be tested in the upcoming lattice simulations. The trans
verse form factor $F(\\vect{y})$ is obtained in variants of the Nambu--Jon
a-Lasinio model with the spectral and Pauli-Villars regularizations. Inter
estingly\, with the spectral regularization of the model\, the effective c
ross section for the double parton scattering of pions is exactly equal to
the geometric cross section\, $\\sigma_{\\rm eff}=\\pi \\langle \\vect{y}
^2 \\rangle$ and yields about 20~mb.\n\nhttps://agenda.infn.it/event/17749
/contributions/104904/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104904/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Combining QED and QCD transverse-momentum resummation for vector b
oson production at hadron colliders
DTSTART;VALUE=DATE-TIME:20191127T083000Z
DTEND;VALUE=DATE-TIME:20191127T085000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104792@agenda.infn.it
DESCRIPTION:Speakers: Giancarlo Ferrera (MI)\nWe consider the transverse-m
omentum (qT) distribution of Z bosons produced in hadronic collisions. At
small values of qT\, we perform the analytic resummation of the logarithmi
cally enhanced QED contributions up to next-to-leading logarithmic accurac
y\, including the mixed QCD-QED contributions at leading logarithmic accur
acy. Resummed results are consistently matched with the next-to-leading fi
xed-order results at small\, intermediate and large values of qT and combi
ned the known QCD results. We show numerical results at LHC and Tevatron e
nergies\, studying the impact of the QED corrections and providing an esti
mate of the corresponding perturbative uncertainty. We show preliminary re
sults about the extension of our analytic results\, valid for the producti
on of generic neutral and colourless high-mass systems in hadronic collisi
on\, to the case of charged W boson production.\n\nhttps://agenda.infn.it/
event/17749/contributions/104792/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104792/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Factorisation tools for infrared subtraction beyond NLO
DTSTART;VALUE=DATE-TIME:20191127T093000Z
DTEND;VALUE=DATE-TIME:20191127T095000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105017@agenda.infn.it
DESCRIPTION:Speakers: Lorenzo Magnea (TO)\nI will review some recent work
on the infrared subtraction problem beyond NLO\, focusing in particular on
the general definition of local subtraction counterterms. The starting po
int is the infrared factorisation of virtual corrections to fixed-angle sc
attering amplitudes in massless gauge theories\, which can be used to defi
ne local soft and collinear counterterms in terms of matrix elements of fi
eld operators and Wilson lines\, to all orders in perturbation theory. Tra
cing the connection between factorisation and subtraction uncovers signifi
cant simplifications in the structure of counterterms\, especially for nes
ted singular regions\, and we believe that it will be a crucial ingredient
for the construction of minimal\, stable\, and efficient subtraction algo
rithms\, at NNLO and beyond. I will also briefly discuss a detailed implem
entation at NNLO\, where we have completed the relevant analytic integrati
ons forany massless final state.\n\nhttps://agenda.infn.it/event/17749/con
tributions/105017/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105017/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Unpolarized TMD distributions and their evolution from DY and SIDI
S
DTSTART;VALUE=DATE-TIME:20191127T160000Z
DTEND;VALUE=DATE-TIME:20191127T162000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105294@agenda.infn.it
DESCRIPTION:Speakers: Alexey Vladimirov (Regensburg University)\nI present
the analysis of the unpolarized SIDIS and Drell-Yan data within the TMD f
actorization approach and the extraction of unpolarized TMD distributions
and non-perturbative TMD evolution kernel. The joined fit of SIDIS and DY
leads to an accurate determination of the TMD evolution kernel. I also dis
cuss the influence of collinear distributions on TMD physics and the inter
pretation of the non-perturbative part of evolution.\n\nhttps://agenda.inf
n.it/event/17749/contributions/105294/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105294/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TMDs and DPDs on the lattice
DTSTART;VALUE=DATE-TIME:20191128T083000Z
DTEND;VALUE=DATE-TIME:20191128T085000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104663@agenda.infn.it
DESCRIPTION:Speakers: Andreas Schafer (Regensburg University)\nWhile the i
nvestigation of TMDs is a major objective of the EIC\, Double Parton Ditri
butions (DPDs) are crucial for a first principle QCD description of double
parton interactions at LHC\, which contribute to the standard model backg
round for various BSM searches. Both groups of functions are genuinely non
-collinear and non-perturbative. The non-collinearity required the develop
ment of new concepts\, most notably the introduction of soft factors. The
soft factors for TMDs and DPDs turned out to be related. Lattice calculati
ons are expected and actually needed to supplement the experimental effort
s\, e.g. at EIC and LHC but are significantly more difficult than for\,e.g
. PDFs. The talk will review the present status.\n\nhttps://agenda.infn.it
/event/17749/contributions/104663/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104663/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conformal invariance of TMD rapidity evolution
DTSTART;VALUE=DATE-TIME:20191128T093000Z
DTEND;VALUE=DATE-TIME:20191128T095000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105040@agenda.infn.it
DESCRIPTION:Speakers: Giovanni Antonio Chirilli (University of Regensburg)
\nAbstract: The most known scheme to regulate the rapidity/UV divergences
of the Transverse Momentum Distribution operators due to the infinite ligh
t-like gauge links is the Collis Soper Sterman formalism or the Soft Colli
near Effective Theory formalism. An alternative choice is provided by the
scheme used in the small-x physics. The corresponding evolution equations
differ already at leading order. In view of the future Electron-Ion Collid
er accelerator\, which will probe the TMDs at values of the Bjorken x in t
he region between small-x to x $\\sim$ 1\, the different formalisms need t
o be reconciled. Conformal invariance may help us find a solution in this
direction.\nI will discuss the conformal properties of TMD operators and p
resent the result of the conformal rapidity evolution of TMD operators in
the Sudakov region.\n\nhttps://agenda.infn.it/event/17749/contributions/10
5040/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105040/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Universality and universality-breaking effects in factorized e+e-
hadroproduction cross sections
DTSTART;VALUE=DATE-TIME:20191128T103000Z
DTEND;VALUE=DATE-TIME:20191128T105000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105256@agenda.infn.it
DESCRIPTION:Speakers: Andrea Simonelli (Istituto Nazionale di Fisica Nucle
are)\nRecent BELLE measurements provide the cross section for single hadro
n production from e+e- annihilations\, differential in the hadron transver
se momentum with respect to the thrust axis.\nUniversality breaking effect
s due to process-dependent soft factors make it very difficult to relate t
his cross section to that corresponding to hadron-pair production in e+e-
annihilations\, where TMD fragmentation functions are defined\nthrough the
so-called "square-root definition".\nI will examine this correspondence i
n the framework of CSS factorization and provide the sketch of a scheme th
at might allow to relate 1-jet to 2-jet e+e- cross sections\, neatly separ
ating soft and collinear non-perturbative effects from the terms which can
be calculated using a perturbative approach.\n\nhttps://agenda.infn.it/ev
ent/17749/contributions/105256/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105256/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Different forms of the kinematical constraint in BFKL
DTSTART;VALUE=DATE-TIME:20191128T153000Z
DTEND;VALUE=DATE-TIME:20191128T155000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104932@agenda.infn.it
DESCRIPTION:Speakers: Michal Deak (Department of Physics\, Pennsylvania St
ate University)\nWe perform a detailed analysis of the different forms of
the kinematical constraint imposed on the low x evolution. We find that al
l of them generate the same leading anti-collinear poles in Mellin space w
hich agree with BFKL up to NLL order and up to NNLL in N=4 sYM. The coeffi
cients of subleading poles vanish up to NNLL order for all constraints and
we prove that this property should be satisfied to all orders. We then de
monstrate that the kinematical constraints differ at further subleading or
ders of poles. We quantify the differences between the different forms of
the constraints by performing numerical analysis both in Mellin space and
in momentum space.\n\nhttps://agenda.infn.it/event/17749/contributions/104
932/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104932/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The High-Energy Limit of 2 to 2 Partonic Scattering Amplitudes
DTSTART;VALUE=DATE-TIME:20191128T160000Z
DTEND;VALUE=DATE-TIME:20191128T162000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-101724@agenda.infn.it
DESCRIPTION:Speakers: Einan Gardi (University of Edinburgh )\nRecently\, t
here has been significant progress in computing scattering amplitudes in t
he high-energy limit using rapidity evolution equations. I describe the st
ate-of-the-art and demonstrate the interplay between exponentiation of hig
h-energy logarithms and that of infrared singularities. \nThe focus in thi
s talk is the imaginary part of 2 to 2 partonic amplitudes\, which can be
determined by solving the BFKL equation. I demonstrate that the wavefuncti
on is infrared finite\, and that its evolution closes in the soft approxim
ation. Within this approximation I derive a closed-form solution for the a
mplitude in dimensional regularization\, which fixes the soft anomalous di
mension to all orders at NLL accuracy.\nI then turn to finite contribution
s of the amplitude and show that the remaining `hard’ contributions can
be determined algorithmically\, by iteratively solving the BFKL equation i
n exactly two dimensions within the class of single-valued harmonic polylo
garithms.\nTo conclude I present numerical results and analyse large-order
behaviour of the amplitude.\n\nhttps://agenda.infn.it/event/17749/contrib
utions/101724/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/101724/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A model calculation of the transverse-momentum-dependent gluon den
sity in the proton
DTSTART;VALUE=DATE-TIME:20191129T090000Z
DTEND;VALUE=DATE-TIME:20191129T092000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104769@agenda.infn.it
DESCRIPTION:Speakers: Francesco Giovanni Celiberto (University of Pavia an
d INFN)\nWhile significant steps toward the formal definition of quark TMD
s and their extraction from experimental data through global fits has been
made in the last years\, the gluon-TMD field represents a largely unexplo
red territory. Pursuing the goal of extendending our knowledge of this sec
tor\, we present analytic expressions for all $T$-even gluon TMDs at twist
-2\, calculated in a spectator model for the parent nucleon. At variance w
ith respect to previous works\, our approach encodes a flexible parametriz
ation for the spectator-mass spectral density\, allowing us to improve the
description in the small-$x$ region.\nWe build a common framework where v
alence\, sea quark and gluon densities are concurrently generated. Our res
ults can be used to predict the behavior of observables sensitive to gluon
-TMD dynamics.\n\nhttps://agenda.infn.it/event/17749/contributions/104769/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104769/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Drell-Yan pair production with the CCFM-K evolution
DTSTART;VALUE=DATE-TIME:20191126T153000Z
DTEND;VALUE=DATE-TIME:20191126T155000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105071@agenda.infn.it
DESCRIPTION:Speakers: Krzysztof Golec-Biernat (Krzysztof Golec-Biernat)\nD
rell-Yan pair production using transverse momentum dependent parton dist
ributions evolved\nwith the Catani-Ciafaloni-Fiorani-Marchesini-Kwieci\\'n
ski (CCFM-K) equations in the single loop approximation will be discussed.
Such equations are obtained assuming angular ordering of emitted partons
(coherence) for $x\\sim 1$ and transverse momentum ordering for $x \\ll 1$
. This evolution scheme also contains the Collins-Sterman-Sopper (CSS) sof
t gluon resummation. \nComparison with a broad class of data on the transv
erse momentum distribution of the DY pair will be presented.\n\nhttps://ag
enda.infn.it/event/17749/contributions/105071/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105071/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discussion
DTSTART;VALUE=DATE-TIME:20191128T170000Z
DTEND;VALUE=DATE-TIME:20191128T173000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-105298@agenda.infn.it
DESCRIPTION:https://agenda.infn.it/event/17749/contributions/105298/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/105298/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Helicity-dependent generalization of the JIMWLK evolution
DTSTART;VALUE=DATE-TIME:20191129T100000Z
DTEND;VALUE=DATE-TIME:20191129T102000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-104801@agenda.infn.it
DESCRIPTION:Speakers: Florian Cougoulic (The Ohio State University)\nThe s
mall-x evolution equations for the quark and gluon helicity distribution h
ave recently been constructed by finding sub-eikonal corrections to the ei
konal shock wave formalism. Those equations are written for correlators of
infinite light-cone Wilson lines along with the so-called polarized Wilso
n lines. Those equations close in the large $N_c$-limit ($N_c$ is the numb
er of quark colors)\, but also in the large $N_c \\& N_f$-limit ($N_f$ is
the number of quark flavors). However\, in the shock wave formalism\, no c
losed form can be obtained for arbitrary value of $N_c$ and $N_f$.\n\nFor
the unpolarized case\, the generalization of the Balitsky-Kovchegov equati
on is done by the Jalilian-Marian—Iancu—McLerran—Weigert—Leonidov
—Kovner (JIMWLK) functional evolution equation. Such an approach for the
small-x evolution of the helicity is beneficial for numerical evaluation
at finite $N_c$ and $N_f$ (beyond previously used limit)\, and for the eva
luation of helicity-dependent operator with an arbitrary number of Wilson
lines. We derive an analogue of the JIMWLK evolution equation for the smal
l-x evolution of helicity distributions and obtain an evolution equation f
or the target weight functional.\n\nhttps://agenda.infn.it/event/17749/con
tributions/104801/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/104801/
END:VEVENT
BEGIN:VEVENT
SUMMARY:PB TMD distributions from fits to DIS precision data
DTSTART;VALUE=DATE-TIME:20191127T133000Z
DTEND;VALUE=DATE-TIME:20191127T135000Z
DTSTAMP;VALUE=DATE-TIME:20210619T182234Z
UID:indico-contribution-17749-100798@agenda.infn.it
DESCRIPTION:Speakers: Sara Taheri Monfared (DESY)\nWe present a new determ
ination of Transverse Momentum Dependent (TMD) parton distributions applyi
ng the Parton Branching method. The PB TMDs are obtained from fits to prec
ision DIS data using DGLAP splitting functions at leading and higher order
. In addition the CCFM splitting function will be applied to include small
x effects.\nApplications of these new TMD distributions will be discussed
.\n\nhttps://agenda.infn.it/event/17749/contributions/100798/
LOCATION:University of Pavia Aula Foscolo
URL:https://agenda.infn.it/event/17749/contributions/100798/
END:VEVENT
END:VCALENDAR