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|Title: ||Cross-Section Measurement of Charged-Pion Photoproduction from Hydrogen and Deuterium|
|Authors: ||Zhu, L.Y.|
de Jager, C.W.
Jefferson Lab Hall A Colloboration
|Issue Date: ||11-Jun-2003|
|Publisher: ||American Physical Society|
|Citation: ||Zhu, L.Y. et al. "Cross-Section Measurement of Charged-Pion Photoproduction from Hydrogen and Deuterium." Physical Review Letters 91, no. 2 (2003): 022003.|
|Abstract: ||We have measured the differential cross section for the γn→π-p and γp→π+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 Eγ≳3.3 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.|
|Required Publisher Statement: ||© 2003 The American Physical Society|
|Appears in Collections:||Physics Research Works|
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