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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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Adare, A. ; ... ; Makek, Mihael ; ... ; Zhou, S. Cross section and transverse single-spin asymmetry of η mesons in p↑+p collisions at s√=200  GeV at forward rapidity // Physical review. D, Particles, fields, gravitation, and cosmology, 90 (2014), 7; 072008-1-072008-15. doi: 10.1103/PhysRevD.90.072008

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

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