Publications [#304556] of Haiyan Gao

Papers Published

1. Gao, GLEAIH; Howell, CR, Measurement of the Generalized Polarizabilities of the Proton in Virtual Compton Scattering at Q2 = 0.92 and 1.76 GeV2, Phys. Rev. Lett., vol. 93 no. 12 (2004), pp. 122001, ISSN 0031-9007 [doi]
   (last updated on 2026/02/08)

   Abstract:
   We report a virtual Compton scattering study of the proton at low c.m. energies. We have determined the structure functions P(LL)-P(TT)/epsilon and P(LT), and the electric and magnetic generalized polarizabilities (GPs) alpha(E)(Q2) and beta(M)(Q2) at momentum transfer Q(2)=0.92 and 1.76 GeV2. The electric GP shows a strong falloff with Q2, and its global behavior does not follow a simple dipole form. The magnetic GP shows a rise and then a falloff; this can be interpreted as the dominance of a long-distance diamagnetic pion cloud at low Q2, compensated at higher Q2 by a paramagnetic contribution from piN intermediate states.