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

Abstract

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.

Authors:
; ; ; ;  [1]
  1. (JAM) Collaboration
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Org.:
Jefferson Lab Angular Momentum (JAM) Collaboration
OSTI Identifier:
1477561
Alternate Identifier(s):
OSTI ID: 1477740
Report Number(s):
JLAB-THY-18-2678; DOE/OR/23177-4398; arXiv:1804.01965
Journal ID: ISSN 0031-9007; PRLTAO; 152001
Grant/Contract Number:  
AC05-06OR23177; FG02-03ER41260; 11475186
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters Journal Volume: 121 Journal Issue: 15; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Barry, P. C., Sato, N., Melnitchouk, W., Ji, Chueng-Ryong, and Jefferson Lab Angular Momentum. First Monte Carlo Global QCD Analysis of Pion Parton Distributions. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.152001.
Barry, P. C., Sato, N., Melnitchouk, W., Ji, Chueng-Ryong, & Jefferson Lab Angular Momentum. First Monte Carlo Global QCD Analysis of Pion Parton Distributions. United States. https://doi.org/10.1103/PhysRevLett.121.152001
Barry, P. C., Sato, N., Melnitchouk, W., Ji, Chueng-Ryong, and Jefferson Lab Angular Momentum. Wed . "First Monte Carlo Global QCD Analysis of Pion Parton Distributions". United States. https://doi.org/10.1103/PhysRevLett.121.152001.
@article{osti_1477561,
title = {First Monte Carlo Global QCD Analysis of Pion Parton Distributions},
author = {Barry, P. C. and Sato, N. and Melnitchouk, W. and Ji, Chueng-Ryong and Jefferson Lab Angular Momentum},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.121.152001},
journal = {Physical Review Letters},
number = 15,
volume = 121,
place = {United States},
year = {Wed Oct 10 00:00:00 EDT 2018},
month = {Wed Oct 10 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevLett.121.152001

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Cited by: 94 works
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Works referencing / citing this record:

Drawing insights from pion parton distributions
journal, March 2020


Initial-state energy loss in cold QCD matter and the Drell-Yan process
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Microwave Multiplexing on the Keck Array
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Nucleon parton distributions from hadronic quantum fluctuations
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