Cross-section measurement of charged-pion photoproduction from hydrogen and deuterium

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 diagrams.

Arrington, J (author)
Averett, T (author)
Beise, E (author)
Calarco, J (author)
Chang, T (author)
Chen, JP (author)
Chudakov, E (author)
Coman, M (author)
Clasie, B (author)
Crawford, C (author)
Dieterich, S (author)
Dohrmann, F (author)
Dutta, D (author)
Fissum, KevinLund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-kfi (author)
Frullani, S (author)
Gao, H (author)
Gilman, R (author)
Glashausser, C (author)
Gomez, J (author)
Hafidi, K (author)
Hansen, JO (author)
Higinbotham, DW (author)
Holt, RJ (author)
de Jager, CW (author)
Jiang, X (author)
Kinney, E (author)
Kramer, K (author)
Kumbartzki, G (author)
LeRose, J (author)
Liyanage, N (author)
Mack, D (author)
Markowitz, P (author)
McCormick, K (author)
Meekins, D (author)
Meziani, ZE (author)
Michaels, R (author)
Mitchell, J (author)
Nanda, S (author)
Potterveld, D (author)
Ransome, R (author)
Reimer, PE (author)
Reitz, B (author)
Saha, A (author)
Schulte, EC (author)
Seely, J (author)
Sirca, S (author)
Strauch, S (author)
Sulkosky, V (author)
Vlahovic, B (author)
Weinstein, LB (author)
Wijesooriya, K (author)
Williamson, CF (author)
Wojtsekhowski, B (author)
Xiang, H (author)
Xiong, F (author)
Xu, W (author)
Zeng, J (author)
Zheng, X (author)
KärnfysikFysiska institutionen (creator_code:org_t)

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Subatomic Physic ...

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