We compute S-wave and P-wave electromagnetic quarkonium decays at order v7 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.
Electromagnetic quarkonium decays at order v**7 / N.S. Brambilla, M. Emanuele, A. Vairo. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2006:8(2006), pp. 039.039-1-039.039-26. [10.1088/1126-6708/2006/08/039]
Electromagnetic quarkonium decays at order v**7
N.S. Brambilla;A. Vairo
2006
Abstract
We compute S-wave and P-wave electromagnetic quarkonium decays at order v7 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.
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