期刊论文

Adams, J

英文

PHYSICAL REVIEW LETTERS

0031-9007

2004

92

17

171801-1-171801-6

10.1103/PhysRevLett.92.171801

We thank the RHIC Operations Group and RCF at BNL, and the NERSC Center at LBNL for their sup?>port. This work was supported in part by the HENP Divisions of the Office of Science of the U.S. DOE; the U.S. NSF; the BMBF of Germany; IN2P3, RA, RPL, and EMN of France; EPSRC of the United Kingdom; FAPESP of Brazil; the Russian Ministry of Science and Technology; the Ministry of Education and the NNSFC of China; Grant Agency of the Czech Republic, DAE, DST, and CSIR of the Government of India; the Swiss NSF.

本校为其他机构

Measurements of the production of forward high-energy π0mesons from transversely polarized proton collisions at √s = 200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at xFbelow about 0.3, and becomes positive and large at higher xF, similar to the trend in data at √s ≤20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with pT>1 GeV=c at a polarized proton co...