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

LY Zhu, J Arrington, T Averett, E Beise, J Calarco, T Chang, JP 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, JO Hansen, DW Higinbotham, RJ Holt, CW de Jager, X Jiang, E Kinney, K Kramer, G Kumbartzki, J LeRose, N Liyanage, D Mack, P Markowitz, K McCormick, D Meekins, ZE Meziani, R Michaels, J Mitchell, S Nanda, D Potterveld, R Ransome, PE Reimer, B Reitz, A Saha, EC Schulte, J Seely, S Sirca, S Strauch, V Sulkosky, B Vlahovic, LB Weinstein, K Wijesooriya, CF Williamson, B Wojtsekhowski, H Xiang, F Xiong, W Xu, J Zeng, X Zheng

    Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

    Sammanfattning

    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.
    Originalspråkengelska
    TidskriftPhysical Review Letters
    Volym91
    Nummer2: 022003
    DOI
    StatusPublished - 2003

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