Measurement of Transverse Single-Spin Asymmetries for Midrapidity Production of Neutral Pions and Charged Hadrons in Polarized p+p Collisions at {radical}(s)=200 GeV
- Brookhaven National Laboratory, Upton, New York 11973-5000 (United States); and others
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 {radical}(s)=200 GeV. The data cover a transverse momentum (p{sub T}) 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<p{sub T}<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 {approx}2 GeV/c suggests that pQCD is applicable in the interpretation of the asymmetry results in the relevant kinematic range.
- OSTI ID:
- 20699562
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 20; Other Information: DOI: 10.1103/PhysRevLett.95.202001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). PHENIX Collaboration; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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