A Measurement of the B_s^0 Lifetime using Reconstructed D_s^- Mesons

TL;DR

This paper measures the B_s^0 meson lifetime using reconstructed D_s^- mesons from Z^0 decays, providing a precise lifetime estimate with detailed statistical and systematic uncertainties.

Contribution

It presents a novel measurement of the B_s^0 lifetime using a large dataset and specific decay channels, improving the precision of lifetime estimates in particle physics.

Findings

Measured B_s^0 lifetime as 1.72 ps with combined uncertainties.

Analyzed approximately 3.7 million Z^0 decays with 911 candidate events.

Estimated about 519 candidates from B_s^0 decays.

Abstract

We report a measurement of the B^0_s meson lifetime from B_s^0 -> D^-_s X decays, where D_s^- mesons are reconstructed in the D_s^- -> phi pi^- and D_s^- -> K^{*0} K^- decay channels. From approximately 3.7 million hadronic Z^0 decays recorded by the OPAL detector at LEP a sample is selected containing 911 +/- 83 candidates, of which 519 +/- 136 are estimated to be from B_s^0 meson decays. Fitting the distribution of the distance from the beam spot to the decay vertex of the D_s^- candidates with an unbinned likelihood function we measure tau(B_s^0) = 1.72 + 0.20 - 0.19 + 0.18 - 0.17 ps, where the errors are statistical and systematic, respectively.