CERN Accelerating science

Article
Report number	arXiv:2410.07850 ; PoS(DIS2024)236
Title	New measurement of transverse spin effects in (di-)hadron production from muon-deuteron semi-inclusive DIS at COMPASS
Author(s)	Asatryan, Siranush (Yerevan Phys. Inst.)
Collaboration	COMPASS Collaboration
Publication	2024-12-27
Imprint	2024-10-10
Number of pages	7
In:	PoS DIS2024 (2025) 236
In:	31st International Workshop on Deep Inelastic Scattering, Grenoble, France, 8 - 12 Apr 2024, pp.236
DOI	10.22323/1.469.0236
Subject category	hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; NA58
Abstract	The COMPASS experiment is a fixed-target high-energy physics experiment that has been collecting data for 20 years (2002 to 2022) at the M2 beamline (SPS, North Area) at CERN. One of the goals of the experiment's broad physics program was to perform semi-inclusive measurements of target-spin dependent asymmetries in (di-)hadron production in deep inelastic scattering (DIS) with high-energy muons scattering off polarized nucleons. The latest COMPASS semi-inclusive DIS measurements were performed in 2022 using a transversely polarized $^6$LiD target and a 160 GeV/$c$ muon beam. The first results from approximately two-thirds of the new data exhibit total uncertainties that are up to a factor of three smaller than those observed in previous deuteron measurements. These results serve to balance the existing data collected with transversely polarized proton targets, which is of particular importance in constraining the $d$-quark transversity and Sivers functions.
Copyright/License	publication: © 2024-2025 The author(s) (License: CC-BY-NC-ND-4.0) preprint: (License: arXiv nonexclusive-distrib 1.0)

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