Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2004-09-21
Phys.Rev.C71:044603,2005
Physics
Nuclear Physics
Nuclear Experiment
18 pages, 19 figures
Scientific paper
10.1103/PhysRevC.71.044603
The differential cross section for the gamma +n --> pi- + p and the gamma + p --> pi+ 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- and pi+ 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+ 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.
Jefferson Lab Hall A Collaboration
Zhu Jefferson Lab E94-104 Collaboration: L. Y.
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