Measurement of transverse-single-spin asymmetries for midrapidity and forward-rapidity production of hadrons in polarized p+p collisions at √s=200 and 62.4 GeV

0522682 - FZÚ 2020 RIV US eng J - Journal Article
Adare, A. - Afanasiev, S. - Aidala, C. - Mašek, L. - Mikeš, P. - Růžička, Pavel - Tomášek, Lukáš - Vrba, Václav … Total 451 authors
Measurement of transverse-single-spin asymmetries for midrapidity and forward-rapidity production of hadrons in polarized p+p collisions at √s=200 and 62.4 GeV.
Physical Review D. Roč. 90, č. 1 (2014), s. 1-16, č. článku 012006. ISSN 2470-0010. E-ISSN 2470-0029
Institutional support: RVO:68378271
Keywords : PHENIX * p p: interaction * p: polarized beam * tables * pi: charged particle * eta: radiative decay * pi0: radiative decay * energy dependence
OECD category: Particles and field physics
Impact factor: 4.643, year: 2014
Method of publishing: Limited access
https://doi.org/10.1103/physrevd.90.012006

Measurements of transverse-single-spin asymmetries (AN) in p+p collisions at s=62.4 and 200 GeV with the PHENIX detector at the Relativistic Heavy Ion Collider are presented. At midrapidity, AN is measured for neutral pion and eta mesons reconstructed from diphoton decay, and, at forward rapidities, neutral pions are measured using both diphotons and electromagnetic clusters. The neutral-pion measurement of AN at midrapidity is consistent with zero with uncertainties a factor of 20 smaller than previous publications, which will lead to improved constraints on the gluon Sivers function. At higher rapidities, where the valence quark distributions are probed, the data exhibit sizable asymmetries. In comparison with previous measurements in this kinematic region, the new data extend the kinematic coverage in s and pT, and it is found that the asymmetries depend only weakly on s.
Permanent Link: http://hdl.handle.net/11104/0307130