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Zhu LY, Arrington J, Averett T, Beise E, Calarco J, Chang T, Chen JP, 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 JO, Higinbotham DW, Holt RJ, De Jager CW, Jiang X, Kinney E, Kramer K, Kumbartzki G, LeRose J, Liyanage N, Mack D, Markowitz P, McCormick K, Meekins D, Meziani ZE, Michaels R, Mitchell J, Nanda S, Potterveld D, Ransome R, Reimer PE, Reitz B, Saha A, Schulte EC, Seely J, Sirca S, Strauch S, Sulkosky V, Vlahovic B, Weinstein LB, Wijesooriya K, Williamson CF, Wojtsekhowski B, Xiang H, Xiong F, Xu W, Zeng J, Zheng X. Cross-section measurement of charged-pion photoproduction from hydrogen and deuterium. Phys Rev Lett 2003; 91:022003. [PMID: 12906473 DOI: 10.1103/physrevlett.91.022003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2002] [Indexed: 05/24/2023]
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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Affiliation(s)
- L Y Zhu
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Burger WJ, Beise E, Gilad S, Redwine RP, Roos PG, Chant NS, Breuer H, Ciangaru G, Silk JD, Blanpied GS, Preedom BM, Ritchie BG, Blecher M, Gotow K, Lee DM, Ziock H. Reaction 58Ni( pi +,pp) at T pi +=160 MeV. Phys Rev C Nucl Phys 1990; 41:2215-2228. [PMID: 9966584 DOI: 10.1103/physrevc.41.2215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Burger WJ, Beise E, Gilad S, Redwine AR, Roos PG, Chant NS, Breuer H, Ciangaru G, Silk JD, Blanpied GS, Preedom BM, Ritchie BG, Blecher M, Gotow K, Lee DM, Ziock H. Reaction 58Ni( pi +,2p) at 160 MeV. Phys Rev Lett 1986; 57:58-61. [PMID: 10033357 DOI: 10.1103/physrevlett.57.58] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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