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Global QCD Analysis of Pion Parton Distributions with Threshold Resummation

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arxiv 2108.05822 v2 pith:ZUHMF2HP submitted 2021-08-12 hep-ph hep-exhep-latnucl-th

P. C. Barry , Chueng-Ryong Ji , N. Sato , W. Melnitchouk This is my paper
classification hep-phhep-exhep-latnucl-th
keywords resummationapproxpionvalenceanalysisbetadistributionsglobal
verification ladder T0 review T1 audit T2 compute T3 formal
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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 $\sim (1-x)^{\beta_v}$ can differ significantly, with $\beta_v$ ranging from $\approx 1$ 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 $\approx 40\%$, increasing the gluon contribution to the pion mass to $\approx 40$ MeV.

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Cited by 13 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

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    hep-ph 2025-07 conditional novelty 7.0 of 10

    A global fit of pion parton distributions including lattice gluon data reduces uncertainties on the high-x gluon PDF and indicates a gluon enhancement in the pion over the proton.

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