Oscillations of $B_s^0$ mesons as a probe of decays with invisible particles
2019
A new experimental technique to study the decays of $B^0_s$ mesons into the final states involving unreconstructable particles is proposed. The method uses a characteristic feature of fast flavour oscillations of $B^0_s$ mesons. Analysis of the oscillation spectrum of partially reconstructed flavour-tagged $B^0_s$ decays provides information about the mass spectrum of invisible states in these decays and removes any background which does not come from the decays of $B^0_s$ mesons.
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