TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.8.028
TI  - Measurement of Target Spin (in)dependent Asymmetries in Dimuon Production in Pion-Nucleon Collisions at COMPASS
PY  - 2022/07/11
UR  - https://scipost.org/SciPostPhysProc.8.028
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 8
SP  - 028
A1  - Lien, Yu-Hsiang
AU  - Chumakov, Alexandr
AB  - The exploration of the transverse spin structure of the nucleon is one of the main topics of the COMPASS phase-II experiment. In 2015 and 2018 COMPASS performed Drell–Yan (DY) measurements using a 190 GeV π− beam interacting with a transversely polarized NH3 target and unpolarized W target. The azimuthal asymmetries in DY with trans- versely polarized NH3 target are sensitive to various transverse momentum dependent parton distribution functions. Preliminary results on the Sivers asymmetry are consis- tent with the QCD prediction for a sign-change of Sivers functions in DY. The angular coefficients λ, μ and ν that describe the unpolarized part of the DY cross section have been extracted from the data collected with W target. The preliminary results on the angular coefficients indicate the violation of the Lam–Tung relation, consistent with the observation in earlier DY experiments with pion beams.
ER  -

@Article{10.21468/SciPostPhysProc.8.028,
	title={{Measurement of Target Spin (in)dependent Asymmetries in Dimuon Production in Pion-Nucleon Collisions at COMPASS}},
	author={Yu-Hsiang Lien and Alexandr Chumakov},
	journal={SciPost Phys. Proc.},
	pages={028},
	year={2022},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.8.028},
	url={https://scipost.org/10.21468/SciPostPhysProc.8.028},
}