Measurements of W and Z/gamma* cross sections and their ratios in p plus p collisions at RHIC

0539473 - ÚJF 2022 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 - Holub, L. - Kocan, M. - Kosarzewski, L. K. - Kramárik, L. - Líčeník, Robert - Moravcová, Z. - Rusňák, Jan - Šimko, Miroslav - Šumbera, Michal - Vaněk, Jan … celkem 367 autorů
Measurements of W and Z/gamma* cross sections and their ratios in p plus p collisions at RHIC.
Physical Review D. Roč. 103, č. 1 (2021), č. článku 012001. ISSN 2470-0010. E-ISSN 2470-0029
Grant CEP: GA MŠMT LTT18002
Výzkumná infrastruktura: BNL-CZ II - 90109
Institucionální podpora: RVO:61389005
Klíčová slova: STAR collaboration * cross sections * heavy ion collisions
Obor OECD: Particles and field physics
Impakt faktor: 5.407, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevD.103.012001

We report on the W and Z/gamma* differential and total cross sections as well as the W+/W- and (W+ + W-)/(Z/gamma*) cross section ratios measured by the STAR experiment at RHIC in p+p collisions at root s = 500 GeV and 510 GeV. The cross sections and their ratios are sensitive to quark and antiquark parton distribution functions. In particular, at leading order, the W cross section ratio is sensitive to the (d) over bar/(u) over bar ratio. These measurements were taken at high Q(2) similar to M-W(2), M-Z(2) and can serve as input into global analyses to provide constraints on the sea quark distributions. The results presented here combine three STAR datasets from 2011, 2012, and 2013, accumulating an integrated luminosity of 350 pb(-1). We also assess the expected impact that our W+/W- cross section ratios will have on various quark distributions, and find sensitivity to the (u) over bar - (d) over bar and (d) over bar/(u) over bar, distributions.
Trvalý link: http://hdl.handle.net/11104/0317207