QCD@LHC 2025

Session

Polarized deep-inelastic physics

11 Sept 2025, 09:00

Meeting Room 101

178. Polarized measurements with the EPIC detector at the EIC

Norbert Novitzky (Oak Ridge National Laboratory - (US))

11/09/2025, 09:00

The ePIC detector at the upcoming Electron-Ion Collider will open an unprecedented window into the inner workings of protons and nuclei. Optimized for polarized deep inelastic scattering, semi-inclusive and exclusive processes, and diffractive channels, ePIC will achieve unmatched precision in these measurements. It will enable detailed studies of the origin of nucleon spin and the...

103. NNPDFpol2.0

Felix Hekhorn (University of Jyväskylä)

11/09/2025, 09:30

We discuss the latest release of polarized PDFs from the NNPDF collaboration and highlight the recent progress in their determination. Specifically, first, we include most currently available data at polarized colliders; second, we investigate the improved hyper-optimization strategy of our neural network methodologies for the extraction of PDF; third, we use an improved theory framework,...

102. Updates from JAM at high x and the reco of d2 and polarized HT effects.

Nobuo Sato

11/09/2025, 10:00

I will discuss recent work on d2.

96. UVA NMR System of the SpinQuest Polarized Target System

Nuwan Chaminda Gunawardhana Waduge (University of Virginia (US))

11/09/2025, 11:00

Polarized targets are essential tools in probing nucleon spin structure within high-energy and nuclear physics experiments. The SpinQuest polarized target system at Fermilab includes key components such as a cryogenic evaporation refrigerator for high-power cooling at 1 K, a roots pump stack with 17000 m3/hour of pumping capacity, a microwave generator, and NMR system. The polarization is...

14. TMDs: Twist-2 Matching, Observables and High-Energy Evolution

Yu Jiao Zhu (Max-Planck Institute for Physics)

11/09/2025, 11:22

We present recent progress in precision TMD physics, focusing on three key developments. First, we provide the N3LO twist-2 matching for polarized TMDs, along with the complete set of N3LO polarized DGLAP evolution kernels for quark (gluon) helicity and quark transversity distributions. Second, we achieve N3LL accuracy in predictions for the SIDIS $q_T$ spectrum, the lepton-hadron transverse...

116. Lattice QCD Benchmark of Proton Helicity and Flavor-Dependent Unpolarized TMDPDFs at Physical Quark Masses

Xiang Gao

11/09/2025, 11:44

We present recent lattice QCD results on transverse momentum dependent distributions (TMDs) using boosted hadron correlators in the Coulomb gauge. This method avoids power divergences from Wilson lines and improves access to large momenta and long-range separations. We compute isovector helicity and flavor-dependent unpolarized TMDPDFs of the proton at physical quark masses, using domain-wall...

120. Feasibility of probing parton orbital angular momentum through elastic dijet production in electron-proton collisions

Brandon Manley

11/09/2025, 12:06

Elastic dijet production in electron-proton collisions is one of the main proposed probes of the quark and gluon orbital angular momentum (OAM) distributions. In particular, the azimuthal angular correlations amongst the jets, outgoing proton, and outgoing electron provide access to the OAM distributions. At small $x$, this access is quantified through the first impact-parameter moments of the...