Snowmass White Paper: Probing New Physics with $μ^+ μ^- \to bs$ at a Muon Collider

In this white paper for the Snowmass process, we discuss the prospects of probing new physics explanations of the persistent rare $B$ decay anomalies with a muon collider. If the anomalies are indirect signs of heavy new physics, non-standard rates for $μ^+ μ^- \to b s$ production should be observed with high significance at a muon collider with center of mass energy of $\sqrt{s} = 10$ TeV. The forward-backward asymmetry of the $b$-jet provides diagnostics of the chirality structure of the new physics couplings. In the absence of a signal, $μ^+ μ^- \to b s$ can indirectly probe new physics scales as large as $86$ TeV. Beam polarization would have an important impact on the new physics sensitivity.

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