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Measurement of Target Spin (in)dependent Asymmetries in Dimuon Production in Pion-Nucleon Collisions at COMPASS
by Yu-Hsiang Lien and Alexandr Chumakov
Submission summary
| Authors (as registered SciPost users): | Yu-Hsiang Lien |
| Submission information | |
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| Preprint Link: | scipost_202107_00061v1 (pdf) |
| Code repository: | https://www.dropbox.com/sh/cqverig41k4pldb/AAAkPGRmau0-XZjNJgPx3Ifta?dl=0 |
| Data repository: | https://www.dropbox.com/sh/cqverig41k4pldb/AAAkPGRmau0-XZjNJgPx3Ifta?dl=0 |
| Date accepted: | May 6, 2022 |
| Date submitted: | July 27, 2021, 1:31 p.m. |
| Submitted by: | Yu-Hsiang Lien |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 28th Annual Workshop on Deep-Inelastic Scattering (DIS) and Related Subjects (DIS2021) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
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.
Current status:
Editorial decision:
For Journal SciPost Physics Proceedings: Publish
(status: Editorial decision fixed and (if required) accepted by authors)