Measurement of the [bar over B][superscript 0][subscript s] Meson Lifetime in D[superscript +][subscript s] π[superscript −] Decays

Abstract

We present a measurement of the ratio of the [bar over B][superscript 0][subscript s] meson lifetime, in the flavor-specific decay to D[superscript +][subscript s]π[superscript -], to that of the [bar over B][superscript 0] meson. The pp collision data used correspond to an integrated luminosity of 1fb[superscript -1], 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 [bar over B][superscript 0] lifetime, we determine the flavor-specific [bar over B][superscript 0][subscript s] lifetime to be τ([bar over B][superscript 0][subscript s]) = 1.535±0.015±0.014ps, 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.