Volume 469 - 31st International Workshop on Deep Inelastic Scattering (DIS2024) - WG5: Spin and 3D Structure
Transverse-Spin Asymmetries in COMPASS Drell-Yan Data
M. Niemiec
Full text: pdf
Pre-published on: December 27, 2024
Published on: January 16, 2025
Abstract
Studies of the transverse-spin dependent azimuthal asymmetries in the Drell-Yan process provide insight into the spin-dependent structure of the nucleon and test the limited universality of its transverse momentum dependent parton distributions, which are also studied in deep inelastic scattering. In 2015 and 2018, the COMPASS Collaboration at CERN conducted measurements of the $\pi^{-} \text{p}$ $\rightarrow \mu^{+}\mu^{-}\text{X}$ reaction using a 190 GeV/$c$ pion beam and a transversely polarized NH$_{3}$ target. The results of this analysis were presented, including findings obtained with a novel approach that weights the asymmetries by powers of the transverse momentum of the dimuon system relative to the beam. This method overcomes the convolution over the
intrinsic transverse momentum and provides straightforward access to certain $k_{\text{T}}^{2}$ moments of the transverse momentum dependent parton distribution functions.
DOI: https://doi.org/10.22323/1.469.0229
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