Probing new physics through B s∗ → μ + μ - decay

We perform a model independent analysis of new physics in Bs∗→μ+μ- decay. We intend to identify new physics operator(s) which can provide large enhancement in the branching ratio of Bs∗→μ+μ- above its standard model prediction. For this, we consider new physics in the form of vector, axial-vector, scalar and pseudoscalar operators. We find that scalar and pseudoscalar operators do not contribute to the branching ratio of Bs∗→μ+μ-. We perform a global fit to all relevant b→sμ+μ- data for different new physics scenarios. For each of these scenarios, we predict Br(Bs∗→μ+μ-). We find that a significant enhancement in Br(Bs∗→μ+μ-) is not allowed by any of these new physics operators. In fact, for all new physics scenarios providing a good fit to the data, the branching ratio of Bs∗→μ+μ- is suppressed as compared to the standard model (SM) value. Hence the present b→sμ+μ- data indicates that the future measurement of Br(Bs∗→μ+μ-) is expected to be suppressed in comparison to the standard model prediction.