Study of the rare Bd0 to K*0(K+π-)μ+μ- decay with the LHCb detector

The status of the study of the rare decay Bd0 → K*0μ+μ-, with K*0 → K+π-, or its charged conjugate state, using the LHCb detector is presented. This decay is very sensitive to deviations from Standard Model physics through Forward- Backward and CP asymmetries, among other observables. In one year of LHCb data taking we expect to collect about 4400 of these events with a B/S ratio below 4. This allows the determination of the branching ratio and of the possible CP asymmetry of the branching ratio with a precision of a few percent. The evaluation of the sensitivity of the other observables needs a better understanding of the backgrounds and their distributions. Therefore, more statistics of background simulations is needed. However, I find good resolutions for the measurement of the relevant quantities. (author)