Measurement of Transverse Single-Spin Asymmetries for Midrapidity Production of Neutral Pions and Charged Hadrons in Polarized p+p Collisions at s=200GeV

S. S. Adler et al. (PHENIX Collaboration)
Phys. Rev. Lett. 95, 202001 – Published 11 November 2005

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 1.05.0GeV/c for neutral pions and 0.55.0GeV/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.

  • Figure
  • Figure
  • Received 17 July 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.202001

©2005 American Physical Society

Authors & Affiliations

Click to Expand

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 95, Iss. 20 — 11 November 2005

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×