Article
Double helicity asymmetry in inclusive midrapidity pi(0) production for polarized p+p collisions at root s=200 GeV
Physical Review Letters
Document Type
Article
Disciplines
Publication Version
Published Version
Publication Date
11-1-2004
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.
Copyright Owner
American Physical Society
Copyright Date
2004
Language
en
File Format
application/pdf
Citation Information
S. S. Adler, Sergey Belikov, Paul Constantin, Nathan C. Grau, et al.. "Double helicity asymmetry in inclusive midrapidity pi(0) production for polarized p+p collisions at root s=200 GeV" Physical Review Letters Vol. 93 Iss. 20 (2004) p. 202002 Available at: http://works.bepress.com/craig-ogilvie/249/
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.