Radiative B_c -> tau nu_tau gamma decay
  The radiative "B_c -> tau nu_tau gamma" decay is analyzed in the standard model. The branching ratio of this decay is calculated and the contributions of the Bremstrahlung and structure dependent parts are compared. It is shown that this decay can be detected at LHC. 
T. M. Aliev, and M. Savci (Middle East Technical   University-Ankara-Turkey)