Two Photon Decays of Charmonia from Lattice QCD

Jozef J. Dudek; Robert G. Edwards

doi:10.1103/PhysRevLett.97.172001

Two Photon Decays of Charmonia from Lattice QCD

High Energy Physics - Phenomenology 2008-11-26 v2 High Energy Physics - Lattice

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

Keywords

lattice QCD two-photon decays charmonium form factors eta_c chi_c0

Cite

@article{arxiv.hep-ph/0607140,
  title  = {Two Photon Decays of Charmonia from Lattice QCD},
  author = {Jozef J. Dudek and Robert G. Edwards},
  journal= {arXiv preprint arXiv:hep-ph/0607140},
  year   = {2008}
}

Comments

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

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