Calculation of P-Wave Charmonium Decay Rates Using Dimensional Regularization
Eric Braaten, Yu-Qi Chen
Abstract
Contributions to the decay rates of P-wave charmonium states that are proportional to nf αs3, where nf is the number of flavors of light quarks, are calculated in the framework of nonrelativistic QCD using the threshold expansion method. Dimensional regularization is used to regularize the infrared divergences that arise from the emission of a soft gluon. Our results are consistent with the original calculations of Barbieri et al.
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