Measurement of transverse single-spin asymmetries for midrapidity production of neutral pions and charged hadrons in polarized p+p collisions at √s=200 GeV

Adler, S. S. ; Kapoor, S. S. ; et., al (2005) Measurement of transverse single-spin asymmetries for midrapidity production of neutral pions and charged hadrons in polarized p+p collisions at √s=200 GeV Physical Review Letters, 95 (20). 202001_1-202001_6. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v95/i20/e202001

Related URL: http://dx.doi.org/10.1103/PhysRevLett.95.202001

Abstract

Transverse single-spin asymmetries to probe the transverse-spin structure of the proton have been measured for neutral pions and nonidentified charged hadrons from polarized proton-proton collisions at midrapidity and √s=200 Gev. The data cover a transverse momentum (pT) range 1.0-5.0 GeV/c for neutral pions and 0.5-5.0 GeV/c for charged hadrons, at a Feynman-x value of approximately zero. The asymmetries seen in this previously unexplored kinematic region are consistent with zero within errors of a few percent. In addition, the inclusive charged hadron cross section at midrapidity from 0.5<pT<7.0 GeV/c is presented and compared to next-to-leading order perturbative QCD (pQCD) calculations. Successful description of the unpolarized cross section above ~2 GeV/c suggests that pQCD is applicable in the interpretation of the asymmetry results in the relevant kinematic range.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:16618
Deposited On:15 Nov 2010 13:33
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