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Following updated and extended measurements of the full angular distributionof the decay $\Lambda_b\to \Lambda(\to p\,\pi^-)\mu^+\mu^-$ by the LHCbcollaborations, as well as a new measurement of the $\Lambda \to p \pi^-$ decayasymmetry parameter by the BESIII collaboration, we study the impact of theseresults on searches for non-standard effects in exclusive $b\to s\mu^+\mu^-$decays. To this end, we constrain the Wilson coefficients $\mathcal{C}_{9}$ and$\mathcal{C}_{10}$ of the numerically leading dimension-six operators in theweak effective Hamiltonian, in addition to the relevant nuisance parameters. Instark contrast to previous analyses of this decay mode, the changes in theupdated experimental results lead us to find very good compatibility with boththe Standard Model and with the $b\to s\mu^+\mu^-$ anomalies observed in rare$B$-meson decays. We provide a detailed analysis of the impact of the partialangular distribution, the full angular distribution, and the $\Lambda_b\to\Lambda\mu^+\mu^-$ branching fraction on the Wilson coefficients. In thisprocess, we are also able to constrain the size of the production polarizationof the $\Lambda_b$ baryon at LHCb.

physical review. d/physical review. d.

Bayesian analysis of $b\to s\mu^+\mu^-$ Wilson coefficients using the  full angular distribution of $\Lambda_b\to \Lambda(\to p\, \pi^-)\mu^+\mu^-$  decays