Drell-Yan processes as a probe of charge symmetry violation in the pion and the nucleon

Abstract

We extend earlier investigations of charge symmetry violation in the valence quark distributions of the nucleon, and make similar estimates for the pion. The sensitivity of pion-induced Drell-Yan measurements to such effects is then examined. It is shown that combinations of π + and π − data on deuterium and hydrogen are sensitive to these violations, and that the pion and nucleon charge symmetry violating terms separate as a function of x π and x N respectively. We estimate the background terms which must be evaluated to extract charge symmetry violation.

Charge symmetry violation in the parton distributions of the nucleon

“…However some theoretical calculations have suggested that the CSV in the valence quark distributions may be as large as 5% − 10% [3][4][5][6][7][8] which is rather large compared with the low-energy results. There have been proposed a number of experiments in which CSV may be observed [9].…”

Mesonic Contributions to the Spin and Flavor Structure of the Nucleon

“…An experimental method to test this has been proposed by Londergan et al [75]. This sea is assumed to be symmetric in and whereas the strange sea is suppressed by 50%.…”

Experimental tests of charge symmetry violation in parton distributions

“…For fixed x it will contribute a constant amount to the DY ratio. This was estimated by Londergan et al [21], by taking quark mass effects into account in a Nambu-Jona Lasinio model that was used to calculate pion valence quark distributions. The charge symmetry violating pion PDFs were calculated at a small value of Q 2 and then evaluated at higher Q 2 values using Dokshitzer-GribovLipatov-Altarelli-Parisi (DGLAP) evolution [26 -28].…”