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The light-cone Photon wave function in explicit helicity states, valid formassive quarks and in both momentum and configuration space, is presented byconsidering the leading order photon-proton hard scattering, i.e., thesplitting quark pair scatters with the proton in the Regge limit. Further weapply it to the diffractive scattering at nonzero momentum transfer and reach asimilar factorization as in the case of zero momentum transfer.Comment: 11 pages LaTeX, 2 figures, version to appear in Phys. Rev.

Photon wave function in nonforward diffractive scattering with nonvanishing quark masses