Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at √s = 200 GeV
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; Sakuma, Tai; Seele, Joseph Patrick; Surrow, Bernd; van Nieuwenhuizen, Gerrit J; Walker, Matthew H; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review D
American Physical Society (APS)
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.
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