Constraints on the R-parity violating couplings using the newest measurement of the decay $B_s^0 \rightarrow μ^+ μ^-$

Abstract

Recently, the LHCb collaboration reported the first evidence for the decay $B_s^0 \rightarrow μ^+ μ^-$. A branching ratio of $\mathcal{B}(B_s^0 \rightarrow μ^+ μ^-) = (3.2^{+1.5}_{-1.2}) \times 10^{-9}$ is given. Using the newest data, and together with the most precise predictions of the Standard Model contributions to the decay, we derive the constraints on the combinations of the R-parity violating parameters. Our results are several orders of magnitudes stronger than the constraints in the previous literature. We also update the constraints on the relevant parameters using the upper limit of $\mathcal{B}(B_d^0 \rightarrow μ^+ μ^-)$.