Oscillations of $B_s^0$ mesons as a probe of decays with unreconstructed particles

Abstract

A new experimental technique to study the decays of $B_s^0$ mesons into final states involving unreconstructable particles is proposed. The method uses a characteristic feature of fast flavour oscillations of $B_s^0$ mesons. Analysis of the oscillation-frequency spectrum of partially reconstructed flavour-tagged $B_s^0$ decays provides information about the mass spectrum of unreconstructed decay products and suppresses any background that does not come from the decays of $B_s^0$ mesons.

Comments: 17 pages, 11 figures. Replaced by the version accepted by JHEP. Added Section 4 with studies of resolution, statistical significance and other experimental effects