Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

11-2004

Journal or Book Title

Physical Review Letters

Volume

93

Issue

20

First Page

202002

DOI

10.1103/PhysRevLett.93.202002

Abstract

We present a measurement of the double longitudinal spin asymmetry in inclusive pi(0) production in polarized proton-proton collisions at roots=200 GeV. The data were taken at the Relativistic Heavy Ion Collider with average beam polarizations of 0.27. The measurements are the first in a program to study the longitudinal spin structure of the proton, using strongly interacting probes, at collider energies. The asymmetry is presented for transverse momenta 1-5 GeV/c at midrapidity, where next-to-leading-order perturbative quantum chromodynamic (NLO pQCD) calculations well describe the unpolarized cross section. The observed asymmetry is small and is compared to a NLO pQCD calculation with a range of polarized gluon distributions.

Comments

This article is published as Adler, Stephen Scott, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, A. Al-Jamel, J. Alexander et al. "Double Helicity Asymmetry in Inclusive Midrapidity π 0 Production for Polarized p+ p Collisions at s= 200 G e V." Physical review letters 93, no. 20 (2004): 202002. DOI: 10.1103/PhysRevLett.93.202002. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

Share

COinS