Phys. Rev. D 59, 014004 (1998) [29 pages]Single transverse-spin asymmetries in hadronic pion production |
Jianwei Qiu *
Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000
George Sterman
Institute for Theoretical Physics, State University of New York, Stony Brook, New York 11794-3840
Received 5 June 1998; published 13 November 1998
We analyze single transverse-spin asymmetries for hadronic pion production at large transverse momenta using QCD factorization. In the large xF region, leading contributions to the asymmetries are naturally produced by twist-3 parton correlation functions that couple quark fields and gluon field strengths. With a simple model for these matrix elements, leading-order asymmetries calculated from QCD are consistent with data on pion production from Fermilab, and can be used to predict single-spin asymmetries at BNL RHIC. We argue that our perturbative calculation for the asymmetries is relevant to pion transverse momenta as low as a few GeV.
©1998 The American Physical Society
URL: http://link.aps.org/abstract/PRD/v59/e014004
DOI: 10.1103/PhysRevD.59.014004
PACS: 12.38.Bx, 13.85.Ni, 13.88.+e
* On leave from Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011.
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