Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at √s=200 GeV
- Abelev, B. I.
- Planinić, Mirko
- Poljak, Nikola
- Zoulkarneeva, Y.
Publication date
January 2009
DOI Publisher
American Physical Society (APS) Language
EnglishAbstract
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<pT<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
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