Publications [#304547] of Haiyan Gao

Papers Published

1. al, KWE, Polarization measurement in the high-energy deuteron photodisintegration., Phys. Rev. Lett., vol. 86 no. 14 (2001), pp. 2975 [doi]
   (last updated on 2026/01/14)

   Abstract:
   We present measurements of the recoil proton polarization for the d(gamma-->,p-->)n reaction at straight theta(c.m.) = 90 degrees for photon energies up to 2.4 GeV. These are the first data in this reaction for polarization transfer with circularly polarized photons. The induced polarization p(y) vanishes above 1 GeV, contrary to meson-baryon model expectations, in which resonances lead to large polarizations. However, the polarization transfer Cx does not vanish above 1 GeV, inconsistent with hadron helicity conservation. Thus, we show that the scaling behavior observed in the d(gamma,p)n cross sections is not a result of perturbative QCD. These data should provide important tests of new nonperturbative calculations in the intermediate energy regime.