Two Photon Decays of Charmonia from Lattice QCD

Details Two Photon Decays of Charmonia from Lattice QCD Two Photon Decays of Charmonia from Lattice QCD

2006-07-12

arxiv.org/abs/hep-ph/0607140v2

Phys.Rev.Lett.97:172001,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

Replaced with version to be published in PRL. Expanded discussion of possible systematic errors

Scientific paper

10.1103/PhysRevLett.97.172001

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 $\eta_c \to \gamma^* \gamma^*$ and $\chi_{c0} \to \gamma^* \gamma^*$. At the on-shell point we find approximate agreement with experimental world-average values.

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