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Cross-section measurement of charged-pion photoproduction from hydrogen and deuterium |
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| Authors: | Zhu L Y Arrington J Averett T Beise E Calarco J Chang T Chen J P Chudakov E Coman M Clasie B Crawford C Dieterich S Dohrmann F Dutta D Fissum K Frullani S Gao H Gilman R Glashausser C Gomez J Hafidi K Hansen J-O Higinbotham D W Holt R J De Jager C W Jiang X Kinney E Kramer K Kumbartzki G LeRose J Liyanage N Mack D Markowitz P McCormick K Meekins D Meziani Z-E Michaels R Mitchell J Nanda S Potterveld D Ransome R Reimer P E Reitz B Saha A Schulte E C Seely J Sirca S Strauch S Sulkosky V Vlahovic B Weinstein L B Wijesooriya K Williamson C F Wojtsekhowski B Xiang H Xiong F Xu W Zeng J |
| Institution: | Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. |
| Abstract: | We have measured the differential cross section for the gamman-->pi(-)p and gammap-->pi(+)n reactions at theta(c.m.)=90 degrees in the photon energy range from 1.1 to 5.5 GeV at Jefferson Lab (JLab). The data at E(gamma) greater, similar 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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