Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised proton
C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V., Andrieux, V. Anosov, A. Austregesilo, B. Badelek, F. Balestra, J. Barth, G., Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E. R. Bielert,, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak
TL;DR
This paper reports measurements of Collins and Sivers asymmetries in muon-induced pion and kaon production from transversely polarized protons, revealing non-zero signals for certain particles and providing insights into nucleon spin structure.
Contribution
It presents the first comprehensive analysis of Collins and Sivers asymmetries for multiple mesons using all available COMPASS proton data from 2007 and 2010.
Findings
Non-zero Collins asymmetries for pions in the valence region.
Hints of non-zero Collins asymmetries for kaons.
Positive Sivers asymmetries for positive pions and kaons, zero otherwise.
Abstract
Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero signal for pions and there are hints of non-zero signal also for kaons. The Sivers asymmetries are found to be positive for positive pions and kaons and compatible with zero otherwise.
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