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

Abstract

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.

41 pages, 13 figures

References in corpus (6)

• Soft-Gluon Resummation and the Valence Parton Distribution Function of the Pion
• Distribution Functions of the Nucleon and Pion in the Valence Region
• Chiral Perturbation Theory and the first moments of the Generalized Parton Distriputions in a Nucleon
• Pion momentum distributions in the nucleon in chiral effective theory
• Gluon saturation and Feynman scaling in leading neutron production
• Light-front representation of chiral dynamics in peripheral transverse densities

Cited by in corpus (30)

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• Pion and kaon valence-quark quasiparton distributions
• Reflections upon the Emergence of Hadronic Mass
• Drawing insights from pion parton distributions
• Towards the three-dimensional parton structure of the pion: Integrating transverse momentum data into global QCD analysis
• Complementarity of experimental and lattice QCD data on pion parton distributions
• Tomography of pions and protons via transverse momentum dependent distributions
• Constraining gluon density of pions at large $x$ by pion-induced $J/\psi$ production
• Parton distributions from nonlocal chiral SU(3) effective theory: Flavor asymmetries
• Mellin moments of spin dependent and independent PDFs of the pion and rho meson
• Determination of neutron fracture functions from a global QCD analysis of leading neutron production at HERA
• A Bayesian analysis of light-front models and the nucleon's charmed sigma term
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• Fixed-target charmonium production and pion parton distributions
• Pions in Proton Structure and Everywhere Else
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• Investigating saturation effects and the virtual pion in leading neutron events at HERA with the dipole model
• Flavor symmetry breaking in the $\Delta$ sea
• Global QCD Analysis of Pion Parton Distributions with Threshold Resummation
• Feasibility Study of Pion and Kaon Structure via the Sullivan Process at EicC
• Pion PDFs confronted by Fixed-Target Charmonium Production
• Bayesian Monte Carlo extraction of sea asymmetry with SeaQuest and STAR data
• An analysis of parton distributions in a pion with Bézier parametrizations
• Summary of Structure Functions and PDFs Working Group
• Chiral Corrections to Baryon Electromagnetic Form Factors
• Global analysis on determination of fracture functions considering sea quark asymmetries in the nucleon