Conveners
Thursday: morning / 1
- Lorenzo Rossi (Istituto Nazionale di Fisica Nucleare)
Thursday: morning / 2
- Swagato Mukherjee (Assistant Physicist)
Thursday: afternoon / 1
- Andrea Signori (Istituto Nazionale di Fisica Nucleare)
Thursday: afternoon / 2
- Filippo Delcarro (Istituto Nazionale di Fisica Nucleare)
-
Dr Valerio Bertone (CEA Paris-Sclay)30/05/2024, 09:00
In this talk, I will revisit the evolution of generalised parton distributions (GPDs) at leading order in the strong coupling constant $\alpha_s$ for all of the twist-2 quark and gluon operators. I will present a rederivation of the one-loop evolution kernels, expressing them in a form suitable for implementation, and check analytically that some basic properties, such as DGLAP/ERBL limits and...
Go to contribution page -
Herve Dutrieux (William & Mary)30/05/2024, 09:30
I will present the limits and complementarity of GPD phenomenology using simultaneously lattice QCD, experimental data and theoretical models. I will point out how none of the three can convey a satisfactory picture alone as of now, but explore collectively complementary information. I will stress the crucial role of evolution in the uncertainties on the lattice, the modeling of GPDs at small...
Go to contribution page -
Shohini Bhattacharya (Los Alamos National Laboratory)30/05/2024, 10:00
In this presentation, we provide an overview of Generalized Transverse Momentum Dependent Distributions (GTMDs) of hadrons, recognized as the most comprehensive two-parton correlation functions. We discuss recent advancements in this field, emphasizing the state-of-the-art observables for these quantities and their significant implications for the field of spin physics.
Go to contribution page -
Matteo Cerutti (Hampton University and Jefferson Lab)30/05/2024, 11:00
In this talk, we present the latest results by the MAP Collaboration about the extraction of unpolarized quark Transverse-Momentum-Dependent Distributions (TMD PDFs) and Fragmentation Functions (TMD FFs) from global fits of Drell-Yan and Semi-Inclusive Deep-Inelastic Scattering (SIDIS) data sets. In particular, we discuss the impact of the introduction of flavour dependence in the...
Go to contribution page -
Patrick Barry (Argonne National Lab)30/05/2024, 11:30
Pions and kaons play an important role in QCD, as they are the pseudo-Goldstone bosons of chiral symmetry breaking while also being confined systems of quarks and gluons. Recent works on pion structures through the JAM framework introduce both Drell-Yan (DY) and leading neutron (LN) electroproduction observables to constrain parton distribution functions (PDFs) in the pion. By making use of...
Go to contribution page -
Jose Osvaldo Gonzalez Hernandez (Istituto Nazionale di Fisica Nucleare)30/05/2024, 12:00
We present a first practical implementation of a recently proposed hadron structure oriented (HSO) approach to TMD phenomenology applied to Drell-Yan like processes, including lepton pair production at moderate $Q^2$ and $Z^0$ boson production. We emphasize the HSO's preservation of a basic TMD parton-model-like framework even while accounting for full TMD factorization and evolution. We argue...
Go to contribution page -
Umberto D'Alesio (Istituto Nazionale di Fisica Nucleare)30/05/2024, 14:30
After recalling the latest extractions of the $\Lambda$ polarizing fragmentation functions within a TMD approach from fits to $e^+e^-$ data, I will present theoretical estimates for the spontaneous transverse polarization of $\Lambda$ hyperons produced in unpolarized $pp$ collisions inside a jet. For the latter, transverse momentum effects are included only in the fragmentation mechanism....
Go to contribution page -
Daniel Pitonyak (Lebanon Valley College), Daniel Pitonyak (Lebanon Valley College)30/05/2024, 15:00
I will report on recent QCD global analyses of transverse single-spin asymmetries involving two different approaches: transverse momentum dependent (TMD)/collinear twist-3 (CT3) observables involving single-hadron FFs, and twist-2 collinear observables involving dihadron fragmentation functions (DiFFs). A byproduct of these studies is the extraction of the transversity PDFs and calculation of...
Go to contribution page -
Albi Kerbizi (Istituto Nazionale di Fisica Nucleare)30/05/2024, 15:30
The string+3P0 model of hadronization has been recently applied to the fragmentation of a string stretched between a quark-antiquark pair with correlated spin states. The pair is assumed to be created in e+e- annihilation via the exchange of a virtual photon. To perform simulations of e+e- events, the model has been implemented in the Pythia Monte Carlo event generator by extending the...
Go to contribution page -
Weiyao Ke (Central China Normal University)30/05/2024, 16:30
The Drell-Yan process is essential for the determination of the collinear and transverse momentum dependent (TMD) parton distribution function. For a nuclear target, in addition to the non-perturbative parton structure that is intrinsically different from that of a free nucleon, there are dynamical nuclear matter effects that modify the TMD cross section in proton-nucleus ($pA$) collisions....
Go to contribution page -
Fabian Wunder (Eberhard Karls Universität Tübingen)30/05/2024, 17:00
I will present a calculation of perturbative $T$-odd contributions to the lepton angular distribution in the Drell-Yan process. The talk is based on work done with Valery Lyubovitskij, Werner Vogelsang, and Alexey Zhevlakov; the corresponding pre-print is available under $\texttt{arXiv:2403.18741}$.
Using collinear factorization, we worked at the first order in QCD perturbation theory...
Go to contribution page -
Juliane Haug (Universität Tübingen)30/05/2024, 17:30
I will present a novel semi-analytical method for parton evolution. The talk is based on work done with co-authors Oliver Schüle and Fabian Wunder, the corresponding preprint is $\texttt{arXiv:2404.18667}$.
The presented method is based on constructing a family of analytic functions spanning $x$-space which is closed under the considered evolution equation. Using these functions as a basis,...
Go to contribution page -
Sara Taheri Monfared (DESY)
The Parton Branching (PB) method outlines the evolution of transverse momentum-dependent (TMD) parton distributions across various kinematic regions, ranging from small to large transverse momenta $k_T$. In the small region, the PB method is highly sensitive to both the intrinsic motion of partons (intrinsic $k_T$) and the resummation of soft gluons, as described by the PB TMD evolution...
Go to contribution page