Cross-Section Measurement of Charged-Pion Photoproduction from Hydrogen and Deuterium
- 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.
- Zheng, X.
- Jefferson Lab Hall A Colloboration
DOIAbstract
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.U.S. Department of Energy, National Science Foundation, Ministero dell...
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