Electromagnetic quarkonium decays at order v^7
High Energy Physics - Phenomenology
2011-04-20 v3
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.
Cite
@article{arxiv.hep-ph/0604190,
title = {Electromagnetic quarkonium decays at order v^7},
author = {Nora Brambilla and Emanuele Mereghetti and Antonio Vairo},
journal= {arXiv preprint arXiv:hep-ph/0604190},
year = {2011}
}
Comments
Eq. (A.1) and following comment corrected, rest of the paper unchanged