Cross-section measurement of charged-pion photoproduction from hydrogen and deuterium
- 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, Kevin
- 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
DOIAbstract
We have measured the differential cross section for the gamman-->pi(-)p and gammap-->pi(+)n reactions at theta(c.m.)=90degrees in the photon energy range from 1.1 to 5.5 GeV at Jefferson Lab (JLab). The data at E(gamma)greater than or similar to3.3 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 diagr...
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