Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at root s=510 GeV

0504071 - ÚJF 2020 RIV US eng J - Článek v odborném periodiku
Adam, J. - Adamczyk, L. - Adams, J. R. - Adkins, J. K. - Agakishiev, G. - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Federič, Pavol - Harlenderová, A. - Holub, L. - Kocan, M. - Kosarzewski, L. K. - Kramárik, L. - Kvapil, J. - Líčeník, R. - Lidrych, J. - Matonoha, O. - Moravcová, Z. - Rusňák, Jan - Rusňáková, O. - Šimko, Miroslav - Šumbera, Michal - Vaněk, Jan … celkem 354 autorů
Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at root s=510 GeV.
Physical Review D. Roč. 99, č. 5 (2019), č. článku 051102. ISSN 2470-0010. E-ISSN 2470-0029
Grant CEP: GA MŠMT LTT18002
Institucionální podpora: RVO:61389005
Klíčová slova: STAR collaboration * heavy ion collisions * quark
Obor OECD: Nuclear physics
Impakt faktor: 4.833, rok: 2019
Způsob publikování: Open access
https://doi.org/10.1103/PhysRevD.99.051102

We report new STAR measurements of the single-spin asymmetries A(L) for W+ and W- bosons produced in polarized proton-proton collisions at root s = 510 GeV as a function of the decay-positron and decay-electron pseudorapidity. The data were obtained in 2013 and correspond to an integrated luminosity of 250 pb(-1). The results are combined with previous results obtained with 86 pb(-1). A comparison with theoretical expectations based on polarized lepton-nucleon deep-inelastic scattering and prior polarized proton-proton data suggests a difference between the (u) over bar and (b) over bar quark helicity distributions for 0.05 < x < 0.25. In addition, we report new results for the double-spin asymmetries A(LL) for W-+/-, as well as A(L) for Z/gamma* production and subsequent decay into electron-positron pairs.
Trvalý link: http://hdl.handle.net/11104/0295779