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

L. Y. Zhu et al. (Jefferson Lab Hall A Collaboration)
Phys. Rev. Lett. 91, 022003 – Published 11 July 2003

Abstract

We have measured the differential cross section for the γnπp and γpπ+n reactions at θc.m.=90° in the photon energy range from 1.1 to 5.5 GeV at Jefferson Lab (JLab). The data at Eγ3.3   GeV exhibit a global scaling behavior for both π and π+ photoproduction, consistent with the constituent counting rule and the existing π+ 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 π to π+ photoproduction at high energy is consistent with the prediction based on one-hard-gluon-exchange diagrams.

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  • Received 8 November 2002

DOI:https://doi.org/10.1103/PhysRevLett.91.022003

©2003 American Physical Society

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Vol. 91, Iss. 2 — 11 July 2003

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