Theoretical Uncertainties and Phenomenological Aspects of $B\to X_s\gamma$ Decay

Abstract

We analyze uncertainties in the theoretical prediction for the inclusive branching ratio $BR[B\to X_s\gamma ]$. We find that the dominant uncertainty in the leading order expression comes from its $\mu$-dependence. We discuss a next-to-leading order calculation of $B\to X_s\gamma$ in general terms and check to what extent the $\mu$-dependence can be reduced in such a calculation. We present constraints on the Standard and Two-Higgs-Doublet Model parameters coming from the measurement of $b\to s\gamma$ decay. The current theoretical uncertainties do not allow one to definitively restrict the Standard Model parameters much beyond the limits coming from other experiments. The bounds on the Two-Higgs-Doublet Model remain very strong, though significantly weaker than the ones present in the recent literature. In the Two-Higgs-Doublet Model case, the $b\to s\gamma$, $Z\to b\bar{b}$ and $b\to c\tau {\bar{\nu }}_{\tau }$ processes are enough to give the most restrictive bounds in the $M_{H^{\pm }}-tan\beta$ plane.

22 pages (including figures), MPI-Ph/93-77, TUM-T31-50/93

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