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

L Y Zhu, J Arrington, T Averett, E Beise, J Calarco, T Chang, J P Chen, E Chudakov, M Coman, B Clasie, C Crawford, S Dieterich, F Dohrmann, D Dutta, Kevin Fissum, S Frullani, H Gao, R Gilman, C Glashausser, J GomezK Hafidi, O Hansen, D W Higinbotham, R J Holt, C W de Jager, X Jiang, E Kinney, K Kramer, G Kumbartzki, J LeRose, N Liyanage, D Mack, P Markowitz, K McCormick, D Meekins, Z E Meziani, R Michaels, J Mitchell, S Nanda, D Potterveld, R Ransome, P E Reimer, B Reitz, A Saha, E C Schulte, J Seely, S Sirca, S Strauch, V Sulkosky, B Vlahovic, L B Weinstein, K Wijesooriya, C Williamson, B Wojtsekhowski, H Xiang, F Xiong, W Xu, J Zeng, X Zheng

    Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

    Sammanfattning

    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.
    Originalspråkengelska
    TidskriftPhysical Review C (Nuclear Physics)
    Volym71
    Nummer4
    DOI
    StatusPublished - 2005

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