A Search for Time-Dependent B0s-B0sbar Oscillations Using Exclusively Reconstructed Ds+/- Mesons

TL;DR

This study searches for B_s0-B_s0bar oscillations using reconstructed D_s mesons in Z0 decays, setting limits on the oscillation frequency with a sample of 400,000 events.

Contribution

It introduces a novel method for detecting B_s0 oscillations using exclusively reconstructed D_s mesons and flavor tagging in Z0 decay data.

Findings

Excluded oscillation frequencies below 1.4 ps^{-1}

Excluded certain frequency ranges between 2.4 and 5.3 ps^{-1}

Achieved 95% confidence level limits on B_s0 oscillations.

Abstract

A search for Bs0-Bs0bar oscillations is performed using a sample of 400,000 hadronic Z0 decays collected by the SLD experiment. The Bs0 candidates are reconstructed in the Bs0 to Ds-,X channel with Ds- to phi,pi- or K*0K-. The Bs0 production flavor is determined using the large forward-backward asymmetry of polarized Z0 to b,bbar decays and charge information in the hemisphere opposite that of the Bs0 candidate. The decay flavor is tagged by the charge of the Ds+/-. From a sample of 361 candidates with an average Bs0 purity of 40%, we exclude the following values of the oscillation frequency: Delta m_s < 1.4 ps^{-1} and 2.4 < Delta m_s < 5.3 ps^{-1} at the 95% confidence level.