Pion structure function from leading neutron electroproduction and SU(2) flavor asymmetry

McKenney, Joshua R.; Sato Gonzalez, Nobuo; Melnitchouk, Wally; Ji, Chueng-Ryong

doi:10.1103/PhysRevD.93.054011

Title: Pion structure function from leading neutron electroproduction and SU(2) flavor asymmetry

Journal Article · Tue Mar 01 00:00:00 EST 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.93.054011· OSTI ID:1245177

McKenney, Joshua R. ^[1]; Sato Gonzalez, Nobuo; Melnitchouk, Wally ^[2]; Ji, Chueng-Ryong ^[3]

North Carolina State Univ., Raleigh, NC (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. of North Carolina, Chapel Hill, NC (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
North Carolina State Univ., Raleigh, NC (United States)

We examine the efficacy of pion exchange models to simultaneously describe leading neutron electroproduction at HERA and the $$\bar{d}-\bar{u}$$ flavor asymmetry in the proton. A detailed $$\chi^2$$ analysis of the ZEUS and H1 cross sections, when combined with constraints on the pion flux from Drell-Yan data, allows regions of applicability of one-pion exchange to be delineated. The analysis disfavors several models of the pion flux used in the literature, and yields an improved extraction of the pion structure function and its uncertainties at parton momentum fractions in the pion of $$4 \times 10^{-4} \lesssim x_\pi \lesssim 0.05$$ at a scale of $Q^2$=10 GeV$^2$. Based on the fit results, we provide estimates for leading proton structure functions in upcoming tagged deep-inelastic scattering experiments at Jefferson Lab on the deuteron with forward protons.

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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)

DOE Contract Number:: AC05-06OR23177; FG02-03ER41260

OSTI ID:: 1245177

Report Number(s):: JLAB-THY-15-2183; DOE/OR/23177-3722; arXiv:1512.04459; PRVDAQ

Journal Information:: Physical Review D, Vol. 93, Issue 5; ISSN 2470-0010

Country of Publication:: United States

Language:: English

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