Measurement of P-T-weighted Sivers asymmetries in leptoproduction of hadrons

0508852 - ÚPT 2020 RIV NL eng J - Článek v odborném periodiku
Alexeev, M. - Alexeev, G. D. - Amoroso, A. - Srnka, Aleš … celkem 224 autorů
Measurement of P-T-weighted Sivers asymmetries in leptoproduction of hadrons.
Nuclear Physics. B. Roč. 940, MAR (2019), s. 34-53. ISSN 0550-3213. E-ISSN 1873-1562
Institucionální podpora: RVO:68081731
Klíčová slova: transverse-spin asymmetries * deep-inelastic scattering
Obor OECD: Nuclear physics
Impakt faktor: 2.817, rok: 2019
Způsob publikování: Open access
https://reader.elsevier.com/reader/sd/pii/S055032131830364X?token=F910543B9BE642E0FDCAB02A1EF3E52EEB560E4D393B7D059E559C9B38C35FCDB0D18FD1DE6EF5D19832151B0CF69A41

The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum P-T, allow for the extraction of important transverse-momentum-dependent distribution functions. In particular, the weighted Sivers asymmetries provide direct information on the Sivers function, which is a leading-twist distribution that arises from a correlation between the transverse momentum of an unpolarised quark in a transversely polarised nucleon and the spin of the nucleon. Using the high-statistics data collected by the COMPASS Collaboration in 2010 with a transversely polarised proton target, we have evaluated two types of P-T-weighted Sivers asymmetries, which are both proportional to the product of the first transverse moment of the Sivers function and of the fragmentation function. The results are compared to the standard unweighted Sivers asymmetries and used to extract the first transverse moments of the Sivers distributions for u and d quarks.
Trvalý link: http://hdl.handle.net/11104/0299651