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

Adamczyk, L. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2012) Transverse single-spin asymmetry and cross section for π0 and η mesons at large Feynman x in p↑+p collisions at √s=200  GeV. Physical Review D, 86 (5). 51101(R)-7. ISSN 1550-7998

[img]
Preview
PDF - Published Version
Language: English

Download (347kB) | Preview

Abstract

Measurements of the differential cross section and the transverse single-spin asymmetry, AN, vs xF for π^0 and η mesons are reported for 0.4<xF<0.75 at an average pseudorapidity of 3.68. A data sample of approximately 6.3  pb^−1 was analyzed, which was recorded during p↑+p collisions at √s=200  GeV by the STAR experiment at RHIC. The average transverse beam polarization was 56%. The cross section for π^0, including the previously unmeasured region of xF>0.55, is consistent with a perturbative QCD prediction, and the η/π^0 cross-section ratio agrees with existing midrapidity measurements. For 0.55<xF<0.75, the average A_N for η is 0.210±0.056, and that for π^0 is 0.081±0.016. The probability that these two asymmetries are equal is ∼3%.

Item Type: Article
Keywords: spin, asymmetry, meson, STAR
Date: September 2012
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2012) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 05 Jun 2014 10:21
Last Modified: 23 Feb 2016 15:53
URI: http://digre.pmf.unizg.hr/id/eprint/2247

Actions (login required)

View Item View Item