Exploiting the symmetries of P and S wave for B → K* μ+μ-

After summarizing the current theoretical status of the four-body decay B -> K*(-> K pi)mu(+)mu(-), we apply the formalism of spin-symmetries to the full angular distribution, including the S-wave part involving a broad scalar resonance K-0*. While we recover in the P-wave sector the known relation between the angular observables P-i((1)), we find in the S-wave sector two new relations connecting the coefficients of the S-wave angular distribution and reducing the number of independent S-wave observables from six to four. Included in the experimental data analysis, these relations can help to reduce the background from S-wave pollution. We further point out the discriminative power of the maximum of the angular observable P-2 as a charm-loop insensitive probe of right-handed currents. Moreover, we show that in absence of right-handed currents the angular observables P-4' and P-5' fulfill the relation P-4' = beta P-5' at the position where P-2 reaches its maximum.