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arXiv · hep-ph/0607140

Two Photon Decays of Charmonia from Lattice QCD

Jozef J. Dudek·Robert G. Edwards
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Abstract

We make the first calculation in lattice QCD of two-photon decays of mesons. Working in the charmonium sector, using the LSZ reduction to relate a photon to a sum of hadronic vector eigenstates, we compute form-factors in both the space-like and time-like domains for the transitions $η_c \to γ^* γ^*$ and $χ_{c0} \to γ^* γ^*$. At the on-shell point we find approximate agreement with experimental world-average values.

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Jozef J. Dudek, Robert G. Edwards. 2006-10-31. Two Photon Decays of Charmonia from Lattice QCD. https://doi.org/10.1103/physrevlett.97.172001

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