Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at √s = 200 GeV

STAR Collaboration

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Abstract

Measurements of the production of forward high-energy π0 mesons 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 xF below 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 collider.

Original languageEnglish (US)
Article number171801
Pages (from-to)171801-1-171801-6
JournalPhysical Review Letters
Volume92
Issue number17
DOIs
StatePublished - Apr 30 2004

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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