Cross section and transverse single-spin asymmetry of η mesons in p.sup.↑./sup.+ p collisions at √s=200 GeV at forward rapidity

0522681 - FZÚ 2020 RIV US eng J - Journal Article
Adare, A. - Aidala, C. - Ajitanand, N.N. - Růžička, Pavel - Tomášek, Lukáš - Vrba, Václav … Total 484 authors
Cross section and transverse single-spin asymmetry of η mesons in p^↑+ p collisions at √s=200 GeV at forward rapidity.
Physical Review D. Roč. 90, č. 7 (2014), s. 1-15, č. článku 072008. ISSN 2470-0010. E-ISSN 2470-0029
Institutional support: RVO:68378271
Keywords : Brookhaven RHIC Coll * PHENIX * p p --> eta anything * eta --> 2 photon * 200 GeV-cms * experimental results
OECD category: Particles and field physics
Impact factor: 4.643, year: 2014
Method of publishing: Limited access
https://doi.org/10.1103/physrevd.90.072008

We present a measurement of the cross section and transverse single-spin asymmetry (AN) for η mesons at large pseudorapidity from s=200  GeV p↑+p collisions. The measured cross section for 0.5<pT<5.0  GeV/c and 3.0<|η|<3.8 is well described by a next-to-leading-order perturbative-quantum-chromodynamics calculation. The asymmetries AN have been measured as a function of Feynman-x (xF) from 0.2<|xF|<0.7, as well as transverse momentum (pT) from 1.0<pT<4.5  GeV/c. The asymmetry averaged over positive xF is ⟨AN⟩=0.061±0.014. The results are consistent with prior transverse single-spin measurements of forward η and π0 mesons at various energies in overlapping xF ranges. Comparison of different particle species can help to determine the origin of the large observed asymmetries in p↑+p collisions.

Permanent Link: http://hdl.handle.net/11104/0307129