Studying Hadronic Structure of the Photon in Lattice QCD

Details Studying Hadronic Structure of the Photon in Lattice QCD Studying Hadronic Structure of the Photon in Lattice QCD

2001-01-22

arxiv.org/abs/hep-lat/0101014v1

Phys.Rev.Lett. 86 (2001) 208

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.86.208

We show that the matrix element of a local quark-gluon operator in the photon state, $<\gamma(k\lambda)|\hat O| \gamma(k\lambda)>$, can be calculated in lattice QCD. The result is generalized to other quantities involving space-like photons, including the transition form factor $\gamma\gamma^*\to \pi^0$ 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.

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