arXiv subjects
Publications and source records attributed to G. G. Devidze.
In the presented paper we have estimated additional to the standard model (SM) contributions to the top quark FCNC decays in the framework of the model with one extra dimension. The estimates of performed calculations show that extra dimension models with only one additional spatial dimension cannot raise branching ratio for top FCNC decay.
We present a full calculation of the amplitudes for $B_{d[s]} \to γγ$ in a simple ACD model that extends an incomplete one in a previous paper. We find cancellations between the contributions from different KK towers and a small decrease relative to the SM predictions. It is conjectured that radiative QCD corrections might actually lead to an enhancement in the branching ratios and {\bf CP} asymmetries, but no more than modest ones.
B_s-meson double radiative decay $B \to γγ$ is investigated in frame of supersymmetric extension of the standard model. The branching ratio is calculated. It is shown that for light Higgs particle and heigh $\tanβ$ supersymmetric contribution into branching ratio is significunt large than standard model estimate.
In the present paper the two and three point functions which occur at the study of the various physical processes are considered. The investigation has dan in the framework of the perturbative theory at the one loop level. The general and asymptotic expressions for these functions are obtained.