Soft contributions to hard pion photoproduction
Journal Article
·
· Phys.Rev. D61 (2000) 034014
OSTI ID:755802
Hard, or high transverse momentum, pion photoproduction can be a tool for probing the parton structure of the beam and target. The authors estimate the soft contributions to this process, with an eye toward delineating the region where perturbatively calculable processes dominate. Their soft process estimate is based on vector meson dominance and data based parameterizations of semiexclusive hadronic cross sections. They 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).
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 755802
- Report Number(s):
- DOE/ER/40150-1467; JLAB-THY-99-07; WM-99-106; hep-ph/9903493
- Journal Information:
- Phys.Rev. D61 (2000) 034014, Journal Name: Phys.Rev. D61 (2000) 034014
- Country of Publication:
- United States
- Language:
- English
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