Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-12-14
ECONFC0610161:028,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 3 figures, plenary talk at Heavy Quarks and Leptons 16.10. - 20.10.2006 Munich, Germany; to appear in the proceeding
Scientific paper
We review the theoretical status of the lifetime ratios $\tau_{B^+} / \tau_{B_d}$ and $\tau_{B_s} / \tau_{B_d}$ and of the mixing quantities $\Delta M_s$, $\Delta \Gamma_s$ and $\phi_s$. We show that the ratio $\Delta \Gamma_s / \Delta M_s$ can be determined with almost no non-perturbative uncertainties. Finally we explain how this precise determination of the standard model values can be used to find possible new physics contributions in $\Delta M_s $, $\Delta \Gamma_s$, $\Delta \Gamma_s / \Delta M_s$ and $a_{fs}^s$. Combining the latest experimental bounds on these quantities one already gets some hints for new physics contributions.
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