Global QCD Analysis of Pion Parton Distributions with Threshold Resummation
Journal
Physical Review Letters
Journal Volume
127
Journal Issue
23
Date Issued
2021
Author(s)
Abstract
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)βv can differ significantly, with βv ranging from ?1 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 ?40%, increasing the gluon contribution to the pion mass to ?40 MeV. ? 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
Subjects
Atomic physics
Asymptotics
Bayesian
Drell-Yan
Parton distributions
Resummation
Sea quarks
Total momentum
Hadrons
article
gluon
quark
SDGs
Type
journal article