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Soft Contributions to Hard Pion Photoproduction
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Hard, or high transverse momentum, pion photoproduction can be a tool for probing the parton structure of the beam and target. We estimate the soft contributions to this process, with an eye toward delineating the region where perturbatively calculable processes dominate. Our soft process estimate is based on vector meson dominance and data based parameterizations of semiexclusive hadronic cross sections. We find that soft processes dominate in single pion photoproduction somewhat past 2 GeV transverse momentum at a few times 10 GeV incoming energy. The recent polarization asymmetry data is consistent with the perturbative asymmetry being diluted by polarization insensitive soft processes. Determining the polarized gluon distribution using hard pion photoproduction appears feasible with a few hundred GeV incoming energy (in the target rest frame).
Forward citations
Cited by 1 Pith paper
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Semi-inclusive pion electroproduction at the highest transverse momenta
Direct pion production dominates at high transverse momentum in semi-inclusive electroproduction, and its cross section factorizes to allow extraction of high-x PDFs and the pion distribution amplitude.
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