Conveners
Wednesday: morning / 1
- Umberto D'Alesio (Istituto Nazionale di Fisica Nucleare)
Wednesday: morning / 2
- Jean-Philippe Lansberg (IJCLab- Paris-Saclay U. - CNRS)
Wednesday: afternoon / 1
- Mariaelena Boglione (Istituto Nazionale di Fisica Nucleare)
Wednesday: afternoon / 2
- Matteo Cerutti (Hampton University and Jefferson Lab)
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John Terry (LANL)5/29/24, 9:00 AM
For more than 50 years, bound nucleons have been known to undergo non-trivial modifications due to the presence of the cold nuclear medium. During this time, experimental measurements at collider facilities have focused on exploring how the one-dimensional structure of nucleons is modified, with global QCD analyses proving extremely successful in extracting these distributions. More recently,...
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Emanuele Roberto Nocera (Istituto Nazionale di Fisica Nucleare)5/29/24, 9:30 AM
I discuss MAPPDFpol1.0, a new determination of the helicity-dependent parton distribution functions (PDFs) of the proton from a set of longitudinally polarised inclusive and semi-inclusive deep-inelastic scattering data. The determination includes, for the first time, next-to-next-to-leading order QCD corrections to both processes, and is carried out in a framework that combines a...
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Simone Rodini5/29/24, 10:00 AM
I will present our numerical implementations for the evolution equations of twist-3 collinear parton distributions.
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I will focus on the challenging aspects that this problem poses compared to the standard twist-2 case, which are mostly due to the intrinsically two-dimensional nature of the support for twist-3 distributions.
I will detail our choices for the discretization procedure,... -
Andreas Metz (Department of Physics, Temple University, Philadelphia)5/29/24, 11:00 AM
It is well known that the axial current exhibits the so-called chiral anomaly. The role of this anomaly in the context of the spin sum rule of the nucleon has been intensely discussed soon after the experimental discovery of the spin crisis in the late 1980s. While this field was largely dormant over the last decades, recent work has revived interest in this area. We will discuss...
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Nobuo Sato (Jefferson Lab)5/29/24, 11:30 AM
Recently, new results on the extraction of gluon helicity PDFs have been presented. These new results provide a comprehensive global analysis involving double spin asymmetries from high-energy polarized jet data, large-x polarized DIS, and recent calculations from LQCD. In this talk, I will provide a summary of the recent findings.
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Samuel F. Romera (University of the Basque Country)5/29/24, 12:00 PM
When quarkonium is produced in the low-transverse momentum region, the contribution of soft and ultra-soft radiation between the heavy-quark pair becomes relevant. At this region, non-relativistic QCD (NRQCD) breaks down and we need to promote the long-distance matrix elements to the TMD shape functions (TMDShFs) in the NRQCD factorization procedure. In this talk, I discuss the cross section...
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Luca Maxia (University of Groningen)5/29/24, 2:30 PM
Quarkonia are very "handy" objects for the spin-physics community because they can be used to fill up the lack of information on gluon transverse momentum dependent distributions (TMDs) at energies $Q \lesssim 100$ GeV. In particular, among the different kinds of quarkonia, the $J/\psi$ is definitely the one that attracts the most attention. Nonetheless, its theoretical description is still...
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Cristian Pisano (Istituto Nazionale di Fisica Nucleare)5/29/24, 3:00 PM
Within the framework of transverse momentum dependent factorization in combination with nonrelativistic QCD, we study charmonium and bottomonium production in hadronic collisions. We focus on quarkonium states with even charge conjugation, for which the color-singlet production mechanism is expected to be dominant in the small transverse momentum region, $q^2_T \ll 4M^2_{c,b}$. It is shown...
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Daniel Rein (Universität Tübingen)5/29/24, 3:30 PM
We present a calculation of the single-spin asymmetry (SSA) for the single-inclusive production of hadrons in collisions of transversely polarized protons
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and unpolarized electrons, ep↑ → hX. We compute this transverse spin observable
within the collinear twist-3 factorization approach in perturbative QCD to next-to-leading order (NLO) accuracy. Several production channels contribute at NLO... -
Raj Kishore (University of Basque Country)5/29/24, 4:30 PM
A back-to-back semi-inclusive $J/\psi + jet$ production is a promising process to study gluon transverse momentum distribution (TMDs) at the future electron-ion collider (EIC). A back-to-back configuration allows a higher transverse momentum for $J/\psi$. We present an extension of a previous work where we studied $cos2\phi$ azimuthal asymmetry within the TMD factorization framework. We...
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Ming Li (The Ohio State University)5/29/24, 5:00 PM
Double spin asymmetries for particle and jet productions in longitudinally polarized proton-proton collisions have been the flagship measurements at RHIC to study proton’s spin content originating from gluons. Conventional theoretical framework used to extract gluons’ helicity distribution relies on the collinear factorization framework which is applicable primarily when there exists a large...
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Yu Shi5/29/24, 5:30 PM
We develop a novel parton shower algorithm based on the Gribov-Levin-Ryskin (GLR) evolution equation incorporating the gluon fusion effect to simulate the small- gluon cascade. The formulations of both forward and backward evolution for the GLR equation are presented in our work, and the results from the Monte Carlo implementation of the GLR equation are in complete agreement with its...
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