Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV

The differential cross sections for the gamma n ->pi(-)p and the gamma p ->pi(+)n processes were measured at Jefferson Lab. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles varied from 50(degrees) to 110(degrees). The pi(-) and pi(+) photoproduction data both exhibit a global scaling behavior at high energies and high transverse momenta, consistent with the constituent counting rule prediction and the existing pi(+) data. The data suggest possible substructure of the scaling behavior, which might be oscillations around the scaling value. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV. The differential cross section ratios [d sigma/dt(gamma n ->pi(-)p)/d sigma/dt(gamma p ->pi(+)n)] at high energies and high transverse momenta can be described by calculations based on one-hard-gluon-exchange diagrams.

Arrington, J (author)
Averett, T (author)
Beise, E (author)
Calarco, J (author)
Chang, T (author)
Chen, J P (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, O (author)
Higinbotham, D W (author)
Holt, R J (author)
de Jager, C W (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, Z E (author)
Michaels, R (author)
Mitchell, J (author)
Nanda, S (author)
Potterveld, D (author)
Ransome, R (author)
Reimer, P E (author)
Reitz, B (author)
Saha, A (author)
Schulte, E C (author)
Seely, J (author)
Sirca, S (author)
Strauch, S (author)
Sulkosky, V (author)
Vlahovic, B (author)
Weinstein, L B (author)
Wijesooriya, K (author)
Williamson, C (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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