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Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at root s=200 GeV

Adams, J; Adler, C; Aggarwal, MM; Ahammed, Z; Amonett, J; Anderson, BD; Anderson, M; ... STAR Collaboration, .; + view all (2004) Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at root s=200 GeV. PHYS REV LETT , 92 (17) , Article 171801. 10.1103/PhysRevLett.92.171801. Green open access

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Abstract

Measurements of the production of forward high-energy pi(0) mesons from transversely polarized proton collisions at root200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at x(F) below about 0.3, and becomes positive and large at higher x(F), similar to the trend in data at roots less than or equal to20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with p(T)>1 GeV/c at a polarized proton collider.

Type: Article
Title: Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at root s=200 GeV
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.92.171801
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.92.171801
Language: English
Additional information: © 2004 The American Physical Society
Keywords: PC CNI POLARIMETER, HIGH CHI-F, ANALYZING-POWER, POLARIZED ANTIPROTONS, AZIMUTHAL ASYMMETRY, HARD-SCATTERING, PI-0 PRODUCTION, GEV-C, QCD, ELECTROPRODUCTION
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1324890
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