Measurement of the $B_s^0$ meson lifetime in $D_s^+\pi^-$ decays

TL;DR

This paper reports the most precise measurement to date of the Bs meson lifetime in flavor-specific decays, using LHCb data at 7 TeV, and finds results consistent with theoretical expectations.

Contribution

The paper provides the most precise measurement of the Bs meson lifetime in flavor-specific decays using LHCb data, improving accuracy over previous measurements.

Findings

Measured the Bs meson lifetime as 1.535 +/- 0.015 +/- 0.014 ps.

Determined the ratio of Bs to B0 lifetimes as 1.010 +/- 0.010 +/- 0.008.

Results are consistent with previous measurements and theoretical predictions.

Abstract

We present a measurement of the ratio of the Bs meson lifetime, in the flavor-specific decay to $D_s^+\pi^-$, to that of the B0 meson. The pp collision data used correspond to an integrated luminosity of 1/fb, collected with the LHCb detector, at a center-of-mass energy of 7 TeV. Combining our measured value of 1.010 +/- 0.010 +/- 0.008 for this ratio with the known lifetime, we determine the flavor-specific Bs lifetime to be tau(Bs) = 1.535 +/- 0.015 +/- 0.014 ps, where the uncertainties are statistical and systematic, respectively. This is the most precise measurement to date, and is consistent with previous measurements and theoretical predictions.