Measurement of the B¯0s meson lifetime in D+sπ− decays

LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A; Serra, N; et al (2014). Measurement of the B¯0s meson lifetime in D+sπ− decays. Physical Review Letters, 113(172001):online.

Abstract

We present a measurement of the ratio of the B¯0s meson lifetime, in the flavor-specific decay to D+sπ−, to that of the B¯0 meson. The pp collision data used correspond to an integrated luminosity of 1 fb−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 B¯0 lifetime, we determine the flavor-specific B¯0s lifetime to be τ(B¯0s) = 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.

Abstract

We present a measurement of the ratio of the B¯0s meson lifetime, in the flavor-specific decay to D+sπ−, to that of the B¯0 meson. The pp collision data used correspond to an integrated luminosity of 1 fb−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 B¯0 lifetime, we determine the flavor-specific B¯0s lifetime to be τ(B¯0s) = 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.

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