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

Autori
Adare, A. ; ... ; Makek, Mihael ; ... ; Zhou, S.

Izvornik
Physical Review D - Particles, Fields, Gravitation, and Cosmology (1550-7998) 90 (2014), 7; 072008-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
spin asymmetry; polarized beam; p+p; eta meson; PHENIX; RHIC

Sažetak
We present a measurement of the cross section and transverse single-spin asymmetry (AN) for η mesons at large pseudorapidity from sqrt(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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
PHENIX Collaboration.

POVEZANOST RADA