The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons.
As such, a nonzero Sivers effect for gluons could be a signature of their nonzero orbital angular momentum inside the nucleon.
COMPASS has collected data of semi-inclusive deep inelastic scattering by impinging 160 GeV$/c$ muons on transversely polarised proton
and deuteron targets.
The gluon Sivers asymmetry is extracted from a high-$p_T$ hadron pair sample with the use of monte carlo simulations and the a neural network approach.
The results of a similar analysis for a Collins-like asymmetry for gluons will also be given.
Volume 297 -
XXV International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2017) -
WG6 Spin and 3D Structure
The gluon Sivers asymmetry measurements at COMPASS
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Pre-published on:
October 16, 2017
Published on:
January 16, 2018
Abstract
DOI: https://doi.org/10.22323/1.297.0253
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.