Studying hadronic structure of the photon in lattice QCD.
We show that the matrix element of a local quark-gluon operator in the photon state, <gamma(klambda)/O/gamma(klambda)>, can be calculated in lattice QCD. The result is generalized to other quantities involving spacelike photons, including the transition form factor gammagamma*-->pi(0) and the virtual-photon-nucleon Compton amplitude <gamma*N /gamma*N> which can be used to define the generalized Drell-Hearn-Gerasimov and Bjorken sum rules.
Ji
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Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
Jung
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