2021 journal article

Global QCD Analysis of Pion Parton Distributions with Threshold Resummation


co-author countries: United States of America πŸ‡ΊπŸ‡Έ
Source: Web Of Science
Added: December 13, 2021

We perform the first global QCD analysis of pion valence, sea quark, and gluon distributions within a Bayesian Monte Carlo framework with threshold resummation on Drell-Yan cross sections at next-to-leading log accuracy. Exploring various treatments of resummation, we find that the large-x asymptotics of the valence quark distribution ∼(1-x)^{Ξ²_{v}} can differ significantly, with Ξ²_{v} ranging from β‰ˆ1 to >2.5 at the input scale. Regardless of the specific implementation, however, the resummation induced redistribution of the momentum between valence quarks and gluons boosts the total momentum carried by gluons to β‰ˆ40%, increasing the gluon contribution to the pion mass to β‰ˆ40 MeV.