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

Measurements of the production of forward high-energy pi 0 mesons from transversely polarized proton collisions at sqrt[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 sqrt[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.

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Metadaten
Author:J. Adams, Clemens Adler, Jens Berger, Thomas Dietel, Dominik Bernhard Flierl, Thorsten Kollegger, Jens Sören Lange, Reinhard Stock, Christof Struck, et al., STAR Collaboration
URN:urn:nbn:de:hebis:30-19010
Document Type:Article
Language:English
Date of Publication (online):14.10.2005
Year of first Publication:2004
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Source:Phys. Rev. Lett. 92, 171801 (2004), ©2004 The American Physical Society, http://link.aps.org/abstract/PRL/v92/e171801
HeBIS PPN:191506532
Institutes:Physik
Dewey Decimal Classification:530 Physik
PACS-Classification:12.38.Qk Experimental tests
13.85.Ni Inclusive production with identified hadrons
13.88.+e Polarization in interactions and scattering
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen ohne Print on Demand

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