HERMES Precision Results on g1p, g1d and g1n and the First Measurement of the Tensor Structure Function b1d

TL;DR

This paper presents refined measurements of the g1 structure functions for proton, deuteron, and neutron, along with the first results on the tensor structure function b1d, advancing understanding of nucleon spin structure.

Contribution

It provides the first measurement of the tensor structure function b1d and improves the precision of g1 results through refined analysis and correction techniques.

Findings

Refined g1 measurements for proton, deuteron, and neutron.

First measurement of tensor structure function b1d.

Results cover a broad kinematic range with improved accuracy.

Abstract

Final HERMES results on the proton, deuteron and neutron structure function g1 are presented in the kinematic range 0.0021<x<0.9 and 0.1<Q2<20 GeV2. These results base on a refined analysis and are corrected for radiative and detector smearing effects using an unfolding algorithm. Furthermore, preliminary results on the first measurement of the tensor asymmetry Azz and the tensor structure function b1d are presented.