Cross section and transverse single-spin asymmetry of $\eta$ mesons in $p^{\uparrow}+p$ collisions at $\sqrt{s}=200$ GeV at forward rapidity - INSPIRE

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Cross section and transverse single-spin asymmetry of $\eta$ mesons in $p^{\uparrow}+p$ collisions at $\sqrt{s}=200$ GeV at forward rapidity

PHENIX

Collaboration

Jun 13, 2014

15 pages

Published in:

Phys.Rev.D 90 (2014) 7, 072008

Published: Oct 20, 2014

e-Print:

1406.3541 [hep-ex]

DOI:

10.1103/PhysRevD.90.072008

Experiments:

BNL-RHIC-PHENIX

View in:

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Abstract: (APS)

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.

Note:

484 authors, 13 pages, 11 figures, 4 tables, 2008 data. v2 is version accepted by Phys. Rev. D. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be)publicly available at http://www.phenix.bnl.gov/papers.html

13.85.Ni
13.88.+e
14.20.Dh
25.75.Dw
channel cross section: measured
higher-order: 1
spin: asymmetry
polarized beam: transverse
rapidity
transverse momentum dependence

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