Cross section and transverse single-spin asymmetry of η mesons in p↑+p collisions at s√=200 GeV at forward rapidity (CROSBI ID 210281)
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Podaci o odgovornosti
Adare, A. ; ... ; Makek, Mihael ; ... ; Zhou, S.
engleski
Cross section and transverse single-spin asymmetry of η mesons in p↑+p collisions at s√=200 GeV at forward rapidity
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.
spin asymmetry; polarized beam; p+p; eta meson; PHENIX; RHIC
PHENIX Collaboration.
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Podaci o izdanju
90 (7)
2014.
072008-1-072008-15
objavljeno
1550-7998
10.1103/PhysRevD.90.072008