Publications [#246202] of Haiyan Gao

Papers Published

1. with al, LYZE, Cross-section measurement of charged-pion photoproduction from hydrogen and deuterium, Phys. Rev. Lett., vol. 91 no. 2 (2003), pp. 022003 [doi]
   (last updated on 2026/01/15)

   Abstract:
   We have measured the differential cross section for the gamman-->pi(-)p and gammap-->pi(+)n reactions at theta(c.m.)=90 degrees in the photon energy range from 1.1 to 5.5 GeV at Jefferson Lab (JLab). The data at E(gamma) greater, similar 3.3 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.