Radiative Leptonic B_c Decays in Effective Field Theory
Abstract
The recent discovery of the B_c meson by the CDF collaboration and proposed new experiments at Fermilab and CERN motivate new theoretical studies of the B_c system. Here we investigate the radiative leptonic decay B_c -> gamma l nu. This process is an important background to the annihilation process B_c -> l nu, which will be used to extract the B_c decay constant. We perform a model-independent calculation, based on QCD, of the partial width and various kinematic distributions. We also examine the decay within the framework of NRQCD, an effective field theory of nonrelativistic quarks, generalizing the NRQCD Lagrangian to include external sources for the weak and electromagnetic currents. Finally, we comment on the role of the B_c* intermediate state for very soft photon energies.
Cite
@article{arxiv.hep-ph/9811405,
title = {Radiative Leptonic B_c Decays in Effective Field Theory},
author = {George Chiladze and Adam F. Falk and Alexey A. Petrov},
journal= {arXiv preprint arXiv:hep-ph/9811405},
year = {2009}
}
Comments
15 pages, including 5 embedded postscript figures, uses REVTeX; various clarifications added, results and conclusions unchanged; version to appear in Phys. Rev. D