Charge symmetry breaking from a chiral extrapolation of moments of quark distribution functions
P.E. Shanahan, A.W. Thomas, R.D. Young
TL;DR
This paper uses lattice QCD and chiral extrapolation to quantify charge symmetry violation in nucleon parton distribution functions, revealing small effects in polarized moments but significant corrections in unpolarized ones.
Contribution
It introduces a lattice QCD-based method with chiral extrapolation to determine charge symmetry violation in nucleon PDFs.
Findings
Small chiral corrections for polarized moments
Significant corrections for unpolarized moments
Quantitative estimates of charge symmetry violation
Abstract
We present a determination, from lattice QCD, of charge symmetry violation in the spin- independent and spin-dependent parton distribution functions of the nucleon. This is done by chirally extrapolating recent QCDSF/UKQCD Collaboration lattice simulations of the first several Mellin moments of the parton distribution functions of octet baryons to the physical point. We find small chiral corrections for the polarized moments, while the corrections are quantitatively significant in the unpolarized case.
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