Electromagnetic quarkonium decays at order v^7

Abstract

We compute S-wave and P-wave electromagnetic quarkonium decays at order v^7 in the heavy-quark velocity expansion. In the S-wave case, our calculation confirms and completes previous findings. In the P-wave case, our results are in disagreement with previous ones; in particular, we find that two matrix elements less are needed. The cancellation of infrared singularities in the matching procedure is discussed.

Eq. (A.1) and following comment corrected, rest of the paper unchanged

References in corpus (4)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Effective field theories for heavy quarkonium
• Spin correlations and velocity-scaling in color-octet NRQCD matrix elements
• Open Problems in Heavy Quarkonium Physics

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