The effect of light sea quark symmetry breaking on polarized nucleus and sum rules

TL;DR

This paper investigates how light sea quark symmetry breaking influences polarized structure functions of helium-3 and tritium nuclei, analyzing the effects on sum rules and comparing theoretical predictions with experimental data.

Contribution

It introduces a detailed NLO analysis of polarized nuclear structure functions considering light sea quark symmetry breaking, utilizing recent DIS and SIDIS data.

Findings

Symmetry breaking impacts polarized structure functions.

Differences observed between symmetry breaking and non-breaking scenarios.

Results align with experimental data within uncertainties.

Abstract

The polarized structure functions of $^3He$ and $^3H$ nuclei are calculated in NLO approximation, considering and disregarding the light sea quark symmetry breaking. We employ the polarized structure function of the nucleons within the nucleus extracted from our two recent analysis on polarized DIS data and on polarized DIS+SIDIS data. Since the data of the second analysis cover a bigger range of Bjorken variable, both SU(2) and SU(3) symmetry breaking is considered within the analysis. Then we calculate and compare the polarized structures of nuclei extracted from both scenarios. Also the Bjorken and ELT sum rules are calculated using the moments of structure functions. The results are compared with experimental data and the differences are investigated.