Cross Section Measurements of Charged Pion Photoproduction in Hydrogen and Deuterium from 1.1 to 5.5 GeV
The differential cross section for the {gamma}n {yields} {pi}{sup -}p and the {gamma}p {yields} {pi}{sup +}n processes were measured at Jefferson Lab. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles varied from 50 degree to 110 degree. The {pi}{sup -} and {pi}{sup +} photoproduction data both exhibit a global scaling behavior at high energies and high transverse momenta, consistent with the constituent counting rule prediction and the existing {pi}{sup +} data. The data suggest possible substructure of the scaling behavior, which might be oscillations around the scaling value. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV. The differential cross section ratios at high energies and high transverse momenta can be described by calculations based on one-hard-gluon-exchange diagrams.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 836442
- Report Number(s):
- JLAB-PHY-04-47; DOE/ER/40150-3086; nucl-ex/0409018; TRN: US200503%%697
- Journal Information:
- Physical Review C, Vol. 71; Other Information: No journal information given for this preprint; PBD: 1 Sep 2004
- Country of Publication:
- United States
- Language:
- English
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