Transverse-spin-dependent azimuthal asymmetries of pion and kaon pairs produced in muon-proton and muon-deuteron semi-inclusive deep inelastic scattering

0579227 - ÚPT 2024 RIV NL eng J - Článek v odborném periodiku
Alexeev, G. D. - Alexeev, M. G. - Alice, C. - Amoroso, A. - Andrieux, V. - Anosov, V. - Augsten, K. - Augustyniak, W. - Azevedo, C. D. R. - Badelek, B. - Barth, J. - Beck, R. - Bedfer, Y. - Bernhard, J. - Bodlák, M. - Bradamante, F. - Braun, C. - Bressan, A. - Burtsev, V. E. - Chang, W.-C. - Chatterjee, C. - Chiosso, M. - Chumakov, A. G. - Chung, S. U. - Cicuttin, A. - Correia, P. M. M. - Crespo, M. L. - D'Ago, D. - Dalla Torre, S. - Dasgupta, S. S. - Srnka, Aleš … celkem 194 autorů
Transverse-spin-dependent azimuthal asymmetries of pion and kaon pairs produced in muon-proton and muon-deuteron semi-inclusive deep inelastic scattering.
Physics Letters. B. Roč. 845, 10 October (2023), č. článku 138155. ISSN 0370-2693. E-ISSN 1873-2445
Institucionální podpora: RVO:68081731
Klíčová slova: SIDIS * Di-hadron * Spin * Fragmentation * Transversity * Collins effect
Obor OECD: Particles and field physics
Impakt faktor: 4.3, rok: 2022
Způsob publikování: Open access
https://www.sciencedirect.com/science/article/pii/S0370269323004896

A set of measurements of azimuthal asymmetries in the production of pairs of identified hadrons in deep-inelastic scattering of muons on transversely polarised 6LiD (deuteron) and NH3 (proton) targets is presented. All available data collected in the years 2003–2004 and 2007/2010 with the COMPASS spectrometer using a muon beam of 160GeV/c at the CERN SPS were analysed. The asymmetries provide access to the transversity distribution functions via a fragmentation function that in principle may be independently obtained from e+e− annihilation data. Results are presented, discussed and compared to existing measurements as well as to model predictions. Asymmetries of π+π− pairs measured with the proton target as a function of the Bjorken scaling variable are sizeable in the range x>0.032, indicating non-vanishing transversity distribution and di-hadron interference fragmentation functions. As already pointed out by several authors, the small asymmetries of π+π− measured on the 6LiD target can be interpreted as indication for a cancellation of u and d-quark transversity distributions.
Trvalý link: https://hdl.handle.net/11104/0348081