Collins and Sivers asymmetries for pions and kaons in muon-deuteron DIS
The COMPASS Collaboration: M. Alekseev, V.Yu. Alexakhin, Yu., Alexandrov, G.D. Alexeev, A. Amoroso, A. Arbuzov, B. Bade{\l}ek, F. Balestra,, J. Ball, J. Barth, G. Baum, Y. Bedfer, C. Bernet, R. Bertini, M. Bettinelli,, R. Birsa, J. Bisplinghoff, P. Bordalo, F. Bradamante
TL;DR
This paper reports measurements of Collins and Sivers asymmetries for pions and kaons in muon-deuteron deep-inelastic scattering, finding asymmetries consistent with zero, supporting the cancellation hypothesis between u- and d-quark contributions.
Contribution
First comprehensive measurement of Collins and Sivers asymmetries for identified pions and kaons in muon-deuteron DIS at COMPASS, confirming previous zero asymmetry results.
Findings
Asymmetries are small and compatible with zero within errors.
Results support cancellation between u- and d-quark contributions.
Data collected from 2002 to 2004 at COMPASS.
Abstract
The measurements of the Collins and Sivers asymmetries of identified hadrons produced in deep-inelastic scattering of 160 GeV/c muons on a transversely polarised 6LiD target at COMPASS are presented. The results for charged pions and charged and neutral kaons correspond to all data available, which were collected from 2002 to 2004. For all final state particles both the Collins and Sivers asymmetries turn out to be small, compatible with zero within the statistical errors, in line with the previously published results for not identified charged hadrons, and with the expected cancellation between the u- and d-quark contributions.
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