We reemphasize that the ratio R sµ ≡B(B s → µμ)/∆M s is a measure of the tension of the Standard Model (SM) with the latest measurements ofB(B s → µμ) that does not suffer from the persistent puzzle on the |V cb | determinations from inclusive versus exclusive b → c ν decays and which affects the value of the CKM element |V ts | that is crucial for the SM predictions of bothB(B s → µμ) and ∆M s , but cancels out in the ratio R sµ . In our analysis, we include higher-order electroweak and QED corrections and adapt the latest hadronic input to find a tension of about 2σ for R sµ measurements with the SM independently of |V ts |. We also discuss the ratio R dµ which could turn out, in particular in correlation with R sµ , to be useful for the search for new physics, when data on both ratios improve. R dµ is also independent of |V cb | or more precisely |V td |.
Dark photons and mirror matter are well-motivated dark matter candidates. It is possible that both of them arose during the compactification and symmetry breaking scenario of the heterotic [Formula: see text] string theory and are related to each other. In this case, dark photons can become a natural portal into the mirror world. Unfortunately, the expected magnitude of the induced interactions of ordinary matter with mirror matter is too small to be of phenomenological interest.
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