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Transverse single-spin asymmetry and cross section for π0 and η mesons at large Feynman x in p+p collisions at s=200GeV

L. Adamczyk et al. (STAR Collaboration)
Phys. Rev. D 86, 051101(R) – Published 5 September 2012

Abstract

Measurements of the differential cross section and the transverse single-spin asymmetry, AN, vs xF for π0 and η mesons are reported for 0.4<xF<0.75 at an average pseudorapidity of 3.68. A data sample of approximately 6.3pb1 was analyzed, which was recorded during p+p collisions at s=200GeV by the STAR experiment at RHIC. The average transverse beam polarization was 56%. The cross section for π0, including the previously unmeasured region of xF>0.55, is consistent with a perturbative QCD prediction, and the η/π0 cross-section ratio agrees with existing midrapidity measurements. For 0.55<xF<0.75, the average AN for η is 0.210±0.056, and that for π0 is 0.081±0.016. The probability that these two asymmetries are equal is 3%.

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  • Received 1 June 2012

DOI:https://doi.org/10.1103/PhysRevD.86.051101

© 2012 American Physical Society

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Vol. 86, Iss. 5 — 1 September 2012

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