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Christopher Lee (LANL)15/06/2022, 09:00
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Jianwei Qiu15/06/2022, 09:10
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Johannes Klaus Ludwig Michel (Center for Theoretical Physics)15/06/2022, 09:30
We provide state-of-the art SCETlib predictions for the $W$ and $Z/\gamma^∗$ transverse-momentum ($q_T$) distributions at the LHC at complete three-loop order in resummed perturbation theory (N$^3$LL$'$) and matched to available fixed order. We compare our predictions to high-precision measurements by the ATLAS and CMS experiments. We pay particular attention to the estimation of perturbative...
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Xiaojun Yao (Massachusetts Institute of Technology)15/06/2022, 10:00
Two gluon TMDs with different Wilson line configurations have been studied intensively at small-x: the Weizsacker-Williams type and the dipole type. They have different transverse momentum dependences and thus they will correspond to two different integrated gluon distributions. However, these two distributions have exactly the same expressions in light-cone gauge. In this talk, I will discuss...
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Fatma Aslan (JLab/UConn)15/06/2022, 11:00
Covariant parton model (CPM) is a generalization of the Feyman's parton
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model which does not prefer any special reference system. Within the
framework of covariant parton model, we study the properties of the quark
and antiquark correlators determined by the equations of motion of the
free partons, and derive the polarization vectors for quarks and
antiquarks in mixed-spin and pure-spin... -
Shohini Bhattacharya15/06/2022, 11:30
We report on the first global QCD analysis of the worm gear function g_1T, based on data from COMPASS, HERMES and Jefferson Lab. The results are compared to the Wandzura-Wilczek approximation, the large-Nc approximation, and information from lattice QCD. The talk is based on the preprint arXiv:2110.10253.
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Daniel Pitonyak (Lebanon Valley College)15/06/2022, 12:00
I will discuss the latest results from a global analysis of single transverse-spin asymmetries that includes data from SIDIS, electron-positron annihilation, Drell-Yan, and single-inclusive proton-proton collisions as well as constraints on transversity from lattice QCD and the Soffer bound. This aligns with Milestone 6 of the TMD Collaboration.
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15/06/2022, 14:00
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15/06/2022, 16:00
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Yong Zhao (Argonne National Laboratory)16/06/2022, 09:00
The large-momentum effective theory (LaMET) is a systematic approach to calculate parton physics from Euclidean approaches such as lattice QCD. With major improvements in the non-perturbative renormalization and perturbative matching, the lattice calculation of PDFs with LaMET is now entering the stage of precision control. In this talk, I will present a state-of-the-art lattice QCD...
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Artur Avkhadiev (Massachusetts Institute of Technology)16/06/2022, 09:30
Collins-Soper (CS) evolution kernel is critical to relate transverse-momentum-dependent parton distribution functions (TMDPDFs) at different scales. When the parton transverse momentum is small, q_T \sim \Lambda_{QCD}, the CS kernel is non-perturbative; the determination of the CS kernel in the non-perturbative regime can only be done through experiment or first-principles calculations. I will...
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Michael Engelhardt16/06/2022, 10:00
Generalized transverse momentum-dependent parton distributions (GTMDs)
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provide a comprehensive framework for imaging the internal structure of
the proton. In particular, by encoding the simultaneous distribution of
quark transverse positions and momenta, they allow one to directly access
longitudinal quark orbital angular momentum, and, moreover, to
correlate it with the quark helicity.... -
Stella Schindler (MIT)16/06/2022, 11:00
Non-perturbative parton distributions that arise in the factorization of cross-sections are inaccessible to direct lattice QCD calculations, as their lightcone-dominated dynamics induce a real-time sign problem. One may circumvent this issue by constructing a lattice-calculable distribution that shares the same IR physics as the desired physical distribution, and then connecting the two...
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Patrick Barry (Jefferson Lab)16/06/2022, 11:30
Drell-Yan production data have been used to extract transverse momentum dependent parton distribution functions (TMDPDFs). The evolution of these non-perturbative objects is conveniently described in $b_T$ space, which is the Fourier conjugate to transverse momentum. Both perturbative QCD calculations and non-perturbative TMD functions comprise the Drell-Yan cross section at low and high...
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Weiyao Ke (Los Alamos National Laboratory)16/06/2022, 12:00
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16/06/2022, 14:00
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16/06/2022, 16:00
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Anjie Gao (Massachusetts Institute of Technology)17/06/2022, 09:00
TMD distributions depending on the azimuthal angle provide a non-trivial example of observables that start at subleading order in the power expansion. They also have a long history, for example in 1978 Cahn showed that quark transverse momentum gives rise to an azimuthal cos(phi) asymmetry of the outgoing hadrons in semi-inclusive DIS (SIDIS). Such subleading distributions also are an...
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Leonard Gamberg (Penn State University)17/06/2022, 09:30
We will present our results for TMD factorization at sub-leading power and focus on the matching of the large and small transverse momentum contribution in semi-inclusive deep inelastic scattering process (SIDIS and Drell Yan). We investigate their connection, paying special attention to azimuthal distributions such as the Cahn effect. Our results have consequences for the extension of...
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John Terry (UCLA)17/06/2022, 10:00
In this talk, I will discuss our ongoing work in establishing a factorization and resummation formalism in Drell-Yan and Semi-Inclusive DIS which takes into consideration the evolution of TMDs at sub-leading power.
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Rajan Gupta (Los Alamos National Lab)17/06/2022, 11:00
I will review results for nucleon charges and moments of momentum fraction, helicity and transversity obtained from lattice QCD and discuss systematics using the results obtained by the LANL lattice QCD team as benchmarks.
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Simonetta Liuti (University of Virginia)17/06/2022, 11:30
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Ivan Vitev17/06/2022, 12:00
Event shape observables have been widely used for precision QCD studies at various lepton and hadron colliders. We present recent calculations of the (transverse) energy-energy correlation event shape variable distributions in deep-inelastic scattering. In the framework of soft-collinear effective theory the cross section can be factorized as the convolution of the hard function, beam...
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17/06/2022, 14:00
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