Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at √s = 200 GeV
Name
PhysRevD.80.111108.pdf
Size
324.29 KB
Format
Adobe PDF
Checksum (MD5)
666bf5d0c1a7a28385f69f88e64de943
Author(s)
Balewski, Jan T.
Betancourt, Michael Joseph
Corliss, Ross Cameron
Hays-Wehle, James Prewitt
Hoffman, Alan Michael
Jones, Christopher LaDon
Kocoloski, Adam Philip
Leight, William Axel
Milner, Richard G
Redwine, Robert P
Date Issued
December 2009
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Abelev, B. I., et al. “Longitudinal Double-Spin Asymmetry and Cross Section for Inclusive Neutral Pion Production at Midrapidity in Polarized Proton Collisions at √s = 200 GeV.” Physical Review D, vol. 80, no. 11, Dec. 2009. © 2009 The American Physical Society.
Version
Final published version
Abstract
We report a measurement of the longitudinal double-spin asymmetry ALL and the differential cross section for inclusive π0 production at midrapidity in polarized proton collisions at √s=200 GeV. The cross section was measured over a transverse momentum range of 1 < p[subscript T] < 17 GeV/c and found to be in good agreement with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry was measured in the range of 3.7 < pT < 11 GeV/c and excludes a maximal positive gluon polarization in the proton. The mean transverse momentum fraction of π0's in their parent jets was found to be around 0.7 for electromagnetically triggered events.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevD.80.111108
