Cross Section Measurement of Charged Pion Photoproduction from Hydrogen and Deuterium

Details Cross Section Measurement of Charged Pion Photoproduction from Hydrogen and Deuterium Cross Section Measurement of Charged Pion Photoproduction from Hydrogen and Deuterium

2002-11-08

arxiv.org/abs/nucl-ex/0211009v2

Phys.Rev.Lett.91:022003,2003

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevLett.91.022003

We have measured the differential cross section for the gamma n --> pi- p and gamma p --> pi+ n reactions at center of mass angle of 90 degree in the photon energy range from 1.1 to 5.5 GeV at Jefferson Lab (JLab). The data at photon energies greater than 3.3 GeV exhibit a global scaling behavior for both pi- and pi+ photoproduction, consistent with the constituent counting rule and the existing pi+ photoproduction data. Possible oscillations around the scaling value are suggested by these new data The data show enhancement in the scaled cross section at a center-of-mass energy near 2.2 GeV. The cross section ratio of exclusive pi- to pi+ photoproduction at high energy is consistent with the prediction based on one-hard-gluon-exchange diagrams.

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