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Barbara Pasquini (U. Pavia and INFN-Pavia)05/06/2023, 09:10
I will present an overview of recent advances in the nucleon-structure study with electromagnetic probes from the low- to the high-energy domain.
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In particular, I will focus on the partonic structure of the nucleon and highlight the opportunities for future experiments in the physics of hadron tomography, nucleon spin and mass decomposition. -
Andrea Bressan (Istituto Nazionale di Fisica Nucleare)05/06/2023, 09:50
The Electron-Ion Collider (EIC) will be a powerful new high-luminosity facility in the United States with the capability to collide high-energy electron beams with high-energy proton and ion beams, providing access to those regions in the nucleon and nuclei where their structure is dominated by gluons. Electron and light ion beams will be polarized allowing unprecedented access to the spatial...
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Marco Contalbrigo05/06/2023, 10:30
In the recent years, it has been realized that deep-inelastic scattering with polarization control could provide a variety of spin and azimuthal angle dependent observables sensitive to the quark-gluon interactions. New parton distributions and fragmentation functions have been introduced to describe the rich complexity of the hadron structure and move towards a multi-dimensional imaging of...
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Pasquale Di Nezza (Istituto Nazionale di Fisica Nucleare)05/06/2023, 11:40
The goal of LHCspin is to develop innovative solutions and cutting-edge technologies to access the field of spin physics over the next few years by exploring a unique kinematic regime and exploiting new reaction processes.
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To this end, a polarized gaseous target, operated in combination with high-energy, high-intensity LHC beams and the highly performing LHCb particle detector, has the... -
Simone Rodini05/06/2023, 12:20
In this talk I will present the results for the next-to-leading power TMD factorization of different observables. I will focus the attention on the SIDIS and Drell-Yan processes, summarizing the essential steps in the factorization theorem. Particular attention will be posed to the rapidity divergences, for which I will discuss the emergence and cancellation of a non-standard type of rapidity...
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Dr Francesco Giovanni Celiberto (UAH Madrid)05/06/2023, 14:15
We present exploratory analyses of the 3D proton tomography via polarized time-reversal odd gluon TMD PDFs at twist-2, obtained in a spectator-model framework. We embody in our approach a flexible parameterization for the spectator-mass spectral function, suited to catch both small- and moderate-x effects. All these studies are relevant to unveil the gluon dynamics inside hadrons, which...
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Simone Venturini (Istituto Nazionale di Fisica Nucleare)05/06/2023, 14:55
Using the light-front wave functions (LFWFs) overlap representation, we built a theoretical model for the pion state, that parametrizes different pion parton distribution functions. The model is constructed with two sets of parameters, that can be fitted separately by performing two independent fits: one for the collinear, and one for the transverse direction.
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At present, we have been able to... -
Gunar Schnell (University of the Basque Country UPV/EHU)06/06/2023, 09:00
Fragmentation functions, describing the formation of hadrons from partons, are an indispensable tool in the interpretation of hadron-production data, e.g., in the investigation of nucleon structure via semi-inclusive deep-inelastic scattering. The cleanest process to access fragmentation functions is hadron production in electron-positron annihilation. However, little information can be...
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Charlotte Van Hulse06/06/2023, 09:40
The study of the transverse-momentum dependence of pairs of hadrons
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produced in $e^+e^-$ annihilation in opposite hemispheres
provides access to transverse-momentum-dependent fragmentation functions. At present, the study of pairs of charge-separated pions, kaons and protons as a function of their relative transverse momentum and their fractional energy using the Belle $e^+e^-$ data is... -
Andrea Simonelli06/06/2023, 10:20
The study of TMDs can be extended to thrust-dependent observables, provided the role of the soft gluon radiation is properly considered.
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In particular, the thrust distribution of $e^+e^-$ annihilations into one single hadron presents a rich kinematic structure, that leads to three different factorization theorems. Each of them is associated to a distinct physics framework of transverse... -
Mariaelena Boglione (Istituto Nazionale di Fisica Nucleare)06/06/2023, 11:20
Accessing TMD Fragmentation Functions through the phenomenological analysis of SIDIS data requires a non-trivial disentangling from the TMD Parton Distribution Function, that appear as convolutions in the factorized cross section. Difficulties in this kind of analyses can partly be overcome by exploiting the thrust distribution of $e^+e^-$ annihilation into one single hadron, for which we now...
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Marco Zaccheddu (University and INFN Cagliari)06/06/2023, 12:00
In this talk, we will present a recent re-analysis of Belle data for the transverse $\Lambda$ and $\bar{\Lambda}$ polarization in $e^+e^-$ annihilation processes within a TMD factorization approach and adopting the CSS framework.
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We will also discuss the issue of isospin symmetry and the role of the charm quark contribution, with their impact on the description of the experimental data as... -
Matteo Cerutti (Istituto Nazionale di Fisica Nucleare)06/06/2023, 12:30
We present a study of strong parity-violating contributions that can be included in inclusive Deep Inelastic Scattering (DIS) off an unpolarized proton target. We show that a non vanishing parity-violating structure function arise even in the case of pure photon exchange, in contrast with standard results.
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The size of the additional strong parity-violating term is estimated by fitting... -
Michela Chiosso (Istituto Nazionale di Fisica Nucleare)06/06/2023, 14:15
In 2015 and 2018 the COMPASS experiment at the M2 beamline of the CERN SPS performed measurements of the Drell-Yan process, using a 190 GeV/c negative pion beam impinging on aluminium and tungsten targets and on transversely polarized ammonia target. The goal was investigating the nucleon and the pion structure. AMBER, the newly approved fixed target facility, successor of COMPASS in the same...
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Filippo Delcarro (Istituto Nazionale di Fisica Nucleare)06/06/2023, 14:55
Pion TMDs are not as well defined as their proton counterparts, due to a
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smaller amount of data collected from high energy scattering processes involving pions.
The recent measurements of unpolarized DY cross section taken at COMPASS with different targets could improve the current understanding of pion structures.
We have been investigating, together with the Pavia group and some members... -
Dr Valerio Bertone07/06/2023, 09:00
In this talk I will present an accurate analysis of the theoretical accuracy of the resummation of large logarithms.
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Focusing on double-logarithmic (or Sudakov) resummation relevant to the case of TMD factorisation in Drell-Yan production, I will single out the single sources of theoretical uncertainties.
Specifically, I will show how the introduction of the so-called resummation scale at... -
Emanuele Roberto Nocera (Università di Torino and INFN Torino)07/06/2023, 09:40
I present a preliminary determination of the collinear helicity parton distribution functions (PDFs) of the proton. The determination is performed from a set of inclusive and semi-inclusive deep-inelastic scattering data, it includes next-to-next-to-leading order QCD corrections to both processes for the first time, and it is carried out in a framework that combines a neural-network...
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Lorenzo Rossi (Istituto Nazionale di Fisica Nucleare)07/06/2023, 10:20
In this talk I will present the latest results and updates of the MAP Collaboration about the Transverse Momentum Dependent (TMD) distributions. We discuss the extraction of unpolarized quark TMD Parton Distribution Functions (TMD PDFs) and Fragmentation Functions (TMD FFs) from global fits of Drell-Yan and Semi-Inclusive Deep-Inelastic Scattering (SIDIS) data sets.
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Ignazio Scimemi (Universidad Complutense Madrid)07/06/2023, 11:20
In this talk I will report the recent extraction of TMD from data using the perturbative information up to N4LL. I will discuss extraction methods and error analysis.
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Dr Carlo Flore (Istituto Nazionale di Fisica Nucleare)07/06/2023, 12:00
The transversity and the nucleon tensor charge are fundamental quantities in hadron physics as well as for our comprehension of the nucleon structure. Some tension between the values of the tensor charge, as computed on the basis of phenomenological extractions and lattice QCD simulations, has been observed.
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By means of an explicit example, we present how relaxing some onstraints in... -
Marc Schlegel (University of Tuebingen)07/06/2023, 12:30
Some transverse single-nucleon spin asymmetries in inclusive reactions in electron-nucleon reactions are discussed within a collinear twist-3 approach. The focus will be in particular on the processes eN->gammaX and eN->piX, which may be accessible at the future Electron-Ion Collider. A report on recent, ongoing efforts to understand these observables is presented.
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Luca Maxia (University of Groningen)07/06/2023, 14:15
Quarkonia are very important tools to probe gluon transverse momentum dependent (TMD) distributions at lower energies as compared, for instance, to Higgs production. Among them, the 𝐽/𝜓 meson is one of the most studied, since it frequently decays into lepton pairs, making its detection easier with respect to other quarkonia. Thus, describing observables that involve 𝐽/𝜓 production within a...
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Jelle Bor (University of Groningen (VSI) & Université Paris-Saclay (IJCLab))07/06/2023, 14:45
J/ψ production at the future EIC has been proposed as a tool to probe gluon TMDs. Until recently, a common assumption was to decouple the J/ψ hadronization from other soft mechanisms, even at low transverse momentum. However, at leading order in the TMD factorized expression and within NRQCD, J/ψ is produced via a color-octet state. So, soft gluon emission to become a color-singlet state...
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