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

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Date

2003-06-11

Author

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

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.

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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.