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

Journal Article · Fri Nov 11 04:00:00 EST 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.202001· OSTI ID:20699562

Adler, S S; Aidala, C; Aronson, S H; Chujo, T; David, G; Desmond, E J; Drees, K A; Ewell, L; Franz, A; Guryn, W; Haggerty, J S; Harvey, M; Johnson, B M; Kistenev, E; Kroon, P J; Makdisi, Y I; Mioduszewski, S; Mitchell, J T; Morrison, D P; O'Brien, E ^[1]

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1. 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, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CROSS SECTIONS
GEV RANGE 100-1000
INCLUSIVE INTERACTIONS
PIONS NEUTRAL
POLARIZED BEAMS
PROTON BEAMS
PROTON-PROTON INTERACTIONS
PROTONS
QUANTUM CHROMODYNAMICS
SPIN
TRANSVERSE MOMENTUM