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 Volume 95 Issue 20 Page 202001-1-202001-6 published_at 2005-11-11
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Title ( eng )
Measurement of Transverse Single-Spin Asymmetries for Midrapidity Production of Neutral Pions and Charged Hadrons in Polarized p + p Collisions at √s = 200 GeV
Creator
PHENIX Collaboration
Enokizono Akitomo
Hachiya Takashi
Kohama Takeshi
Nakamura Tomoaki
Source Title
Physical Review Letters
Volume 95
Issue 20
Start Page 202001-1
End Page 202001-6
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=200GeV. The data cover a transverse momentum (pT) range 1.0-5.0GeV/c for neutral pions and 0.5-5.0GeV/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<7.0GeV/c is presented and compared to next-to-leading order perturbative QCD (pQCD) calculations. Successful description of the unpolarized cross section above ∼2GeV/c suggests that pQCD is applicable in the interpretation of the asymmetry results in the relevant kinematic range.
Keywords
quantum chromodynamics
proton-proton inclusive interactions
protons
baryon spin
polarisation in elementary particle interactions
Language
eng
Resource Type journal article
Publisher
American Physical Society
Date of Issued 2005-11-11
Rights
Copyright (c) 2005 The American Physical Society.
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.95.202001
[NCID] AA00773679
[DOI] http://dx.doi.org/10.1103/PhysRevLett.95.202001