Physics Opportunities at an Electron-Ion Collider XI

Revisiting constraints on proton PDFs from HERA DIS, Drell-Yan, W/Z Boson production, and projected EIC measurements

Feb 25, 2025, 6:00 PM

2h

Ground floor (Stocker Astro Center)

poster Poster Session

Speaker

Maral Salajegheh (HISKP, University of Bonn)

Description

We present new parton distribution functions (PDFs) at next-to-leading order (NLO) and
next-to-next-to-leading order (NNLO) in perturbative QCD, derived from a comprehensive global QCD analysis
of high-precision data sets from combined HERA deep-inelastic scattering (DIS),
the Tevatron, and the Large Hadron Collider (LHC). To improve constraints on quark
flavor separation, we incorporate Drell-Yan pair production data, which provides
critical sensitivity to the quark distributions. In addition, we include the latest
W and Z boson production data from the CDF, D0, ATLAS, and CMS collaborations,
further refining both quark and gluon distributions. Our nominal global QCD fit
integrates these datasets and examines the resulting impact on the PDFs and their
associated uncertainties.
Uncertainties in the PDFs are quantified using the Hessian method, ensuring robust
error estimates. Furthermore, we explore the sensitivity of the strong coupling
constant, $\alpha_s(M_Z^2)$, and proton PDFs in light of the projected measurements
from the Electron-Ion Collider (EIC), where improvements in precision are expected.
The analysis also investigates the effects of inclusive
jet and dijet production data, which provide enhanced constraints on the gluon PDF and $\alpha_s(M_Z^2)$.