Publications [#246172] of Haiyan Gao

Papers Published
  1. with al, KAE; Collaboration, HERMES, Observation of a coherence length effect in exclusive rho_0, Phys. Rev. Lett., vol. 82 no. 15 (1999), pp. 3025 .

    Exclusive incoherent electroproduction of the ρ0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q2 > 0.4 GeV2 and positron energy loss v from 9 to 20 GeV. The ratio of the 14N to 1H cross sections per nucleon, known as the nuclear transparency, was found to decrease with increasing coherence length of quark-antiquark fluctuations of the virtual photon. The data provide clear evidence of the interaction of the quark-antiquark fluctuations with the nuclear medium. © 1999 The American Physical Society.