Measurement of Transverse Spin Effects at COMPASS

TL;DR

This paper reports on measurements of transverse spin asymmetries in deep inelastic scattering at COMPASS, providing insights into the transversity distribution and Sivers function with new data from polarized targets.

Contribution

It presents new experimental measurements of transverse single spin asymmetries using identified hadrons and pairs, enhancing understanding of spin-dependent parton distributions.

Findings

Small asymmetries observed in the data

Data collected at 160 GeV/c muon beam

Results contribute to understanding of transversity and Sivers functions

Abstract

By measuring transverse single spin asymmetries one has access to the transversity distribution function $\Delta_T q(x)$ and the transverse momentum dependent Sivers function $q_0^T(x,\vec{k}_T)$. New measurements from identified hadrons and hadron pairs, produced in deep inelastic scattering of a transversely polarized $^6LiD$ target are presented. The data were taken in 2003 and 2004 by the COMPASS collaboration using the muon beam of the CERN SPS at 160 GeV/c, resulting in small asymmetries.