Kavli Affiliate: Wei Gao
| First 5 Authors: Wei Gao, Wei Gao, , ,
| Summary:
We investigate the photon structure functions via the photon-photon and
photon-vector meson scattering within the framework of holographic QCD,
focusing on the small Bjorken $x$ region and assuming that the Pomeron exchange
dominates. The quasi-real photon structure functions are formulated as the
convolution of the known U(1) vector field wave function with the
Brower-Polchinski-Strassler-Tan (BPST) Pomeron exchange kernel in the
five-dimensional AdS space. Assuming the vector meson dominance, the photon
structure functions can be calculated in a different way with the BPST kernel
and vector meson gravitational form factor, which can be obtained in a
bottom-up AdS/QCD model, for the Pomeron-vector meson coupling. It is shown
that the obtained $F_2$ structure functions in the both ways agree with the
experimental data, which implies the realization of the vector meson dominance
within the present model setup. Calculations for the longitudinal structure
function and the longitudinal-to-transverse ratio are also presented.
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