BS-]GAMMA-GAMMA DECAY IN THE 2-HIGGS-DOUBLET MODEL


ALIEV T. , TURAN G.

PHYSICAL REVIEW D, cilt.48, ss.1176-1184, 1993 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 48 Konu: 3
  • Basım Tarihi: 1993
  • Doi Numarası: 10.1103/physrevd.48.1176
  • Dergi Adı: PHYSICAL REVIEW D
  • Sayfa Sayıları: ss.1176-1184

Özet

The rare B(s) --> gammagamma decay has been investigated in the framework of the two-Higgs-doublet model. It is shown that the branching ratio has a great enhancement in comparison to the standard model (SM) prediction. We have found that the ratio of the square of the CP = 1 to CP = -1 amplitudes, \A+\2/\A-\2, which is always less than one in the SM, becomes greater than one for some values of M(H)/M(t). We have also calculated the direct CP-violating parameter epsilon'(gammagamma(-)). It is found that for K --> gammagamma decay its value is greater than the one which follows from the SM, while for B(s) --> gammagamma decay both models have the same predictions. Finally, we compare our results on B(s) --> gammagamma decay with the results of B(s) --> mu+mu- and B(s) --> mu+mu- decays which are of the same order of the coupling constant.