First Monte Carlo Global QCD Analysis of Pion Parton Distributions

Barry, P. C.; Sato, N.; Melnitchouk, W.; Ji, Chueng-Ryong

doi:10.1103/PhysRevLett.121.152001

Title: First Monte Carlo Global QCD Analysis of Pion Parton Distributions

Journal Article · Wed Oct 10 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.152001· OSTI ID:1477561

Barry, P. C.; Sato, N.; Melnitchouk, W.; Ji, Chueng-Ryong

Here, we perform the first global QCD analysis of parton distribution functions (PDFs) in the pion, combining $$\pi A$$ Drell-Yan data with leading neutron electroproduction from HERA within a Monte Carlo approach based on nested sampling. Inclusion of the HERA data allows the pion PDFs to be determined down to much lower values of $$x$$, with relatively weak model dependence from uncertainties in the chiral splitting function. The combined analysis reveals that gluons carry a significantly higher pion momentum fraction, $$\sim 30\%$$, than that inferred from Drell-Yan data alone, with sea quarks carrying a somewhat smaller fraction, $$\sim 15\%$$, at the input scale. Within the same effective theory framework, the chiral splitting function and pion PDFs can be used to describe the $$\bar d-\bar u$$ asymmetry in the proton.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: Jefferson Lab Angular Momentum (JAM) Collaboration

Grant/Contract Number:: AC05-06OR23177; FG02-03ER41260; 11475186

OSTI ID:: 1477561

Alternate ID(s):: OSTI ID: 1477740

Report Number(s):: JLAB-THY-18-2678; DOE/OR/23177-4398; arXiv:1804.01965; PRLTAO; 152001

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 121 Journal Issue: 15; ISSN 0031-9007

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 94 works

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