Transverse Spin Structure of the Nucleon from COMPASS

TL;DR

This paper reports on measurements of transverse spin effects in semi-inclusive deep-inelastic scattering from COMPASS, providing new insights into the nucleon's spin structure through Collins and Sivers asymmetries.

Contribution

It presents new experimental results on Collins and Sivers asymmetries from proton target data, advancing understanding of the nucleon's transverse spin structure.

Findings

Observation of non-zero Collins asymmetries

Observation of non-zero Sivers asymmetries

Enhanced understanding of nucleon spin dynamics

Abstract

The measurement of transverse spin effects in semi-inclusive deep-inelastic scattering is an important part of the COMPASS physics program. In the years 2002-2004 data were taken by scattering a 160 GeV muon beam on a transversely polarized deuteron target. In 2007, additional data were collected on a transversely polarized proton target. New results for the Collins and Sivers asymmetries from the analysis of the proton data are presented.