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

TL;DR

This paper proposes a novel experimental method leveraging $B_s^0$ meson oscillations to study decays involving unreconstructable particles, improving background suppression and providing insights into decay product spectra.

Contribution

It introduces a new technique based on $B_s^0$ meson oscillations to analyze decays with unreconstructable particles, enhancing detection and background rejection capabilities.

Findings

Effective suppression of non-$B_s^0$ decay backgrounds.

Ability to extract mass spectra of unreconstructed decay products.

Potential for improved measurements of $B_s^0$ decay properties.

Abstract

A new experimental technique to study the decays of $B^0_s$ mesons into 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-frequency spectrum of partially reconstructed flavour-tagged $B^0_s$ decays provides information about the mass spectrum of unreconstructed decay products and suppresses any background that does not come from the decays of $B^0_s$ mesons.