Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in p⃗ + p⃗ collisions at √s=200 GeV

0522691 - FZÚ 2020 RIV US eng J - Journal Article
Adare, A. - Aidala, C. - Ajitanand, N.N. - Tomášek, Lukáš - Tomášek, Michal - Vrba, Václav … Total 388 authors
Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in p⃗ + p⃗ collisions at √s=200 GeV.
Physical Review D. Roč. 90, č. 1 (2014), s. 1-19, č. článku 012007. ISSN 2470-0010. E-ISSN 2470-0029
Institutional support: RVO:68378271
Keywords : PHENIX * Brookhaven RHIC Coll * 200 GeV-cms
OECD category: Particles and field physics
Impact factor: 4.643, year: 2014
Method of publishing: Limited access
https://doi.org/10.1103/physrevd.90.012007

Results are presented from data recorded in 2009 by the PHENIX experiment at the Relativistic Heavy Ion Collider for the double-longitudinal spin asymmetry, ALL, for π0 and η production in s=200  GeV polarized p+p collisions. Comparison of the π0 results with different theory expectations based on fits of other published data showed a preference for small positive values of gluon polarization, ΔG, in the proton in the probed Bjorken x range. The effect of adding the new 2009 π0 data to a recent global analysis of polarized scattering data is also shown, resulting in a best fit value ΔGDSSV[0.05,0.2]=0.06-0.15+0.11 in the range 0.05<x<0.2, with the uncertainty at Δχ2=9 when considering only statistical experimental uncertainties.

Permanent Link: http://hdl.handle.net/11104/0307142