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Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Comerma Montells, Albert; Garrido Beltrán, Lluís; Gascón Fora, David; Graciani Díaz, Ricardo; Graugés Pous, Eugeni; Oyanguren Campos, Arantza de; Potterat, Cédric; Ruiz, Hugo (Ruiz Pérez); Ruiz Valls, Pablo; Vilasis-Cardona, Xavier; LHCb Collaboration
Physical review letters, 03/2014Journal Article
The first measurement of the effective lifetime of the ¯ B 0 s meson in the decay ¯ B 0 s → D − s D + s is reported using a proton-proton collision data set, corresponding to an integrated luminosity of 3 fb − 1 , collected by the LHCb experiment. The measured value of the ¯ B 0 s → D − s D + s effective lifetime is 1.379 ± 0.026 ± 0.017 ps , where the uncertainties are statistical and systematic, respectively. This lifetime translates into a measurement of the decay width of the light ¯ B 0 s mass eigenstate of Γ L = 0.725 ± 0.014 ± 0.009 ps − 1 . The ¯ B 0 s lifetime is also measured using the flavor-specific ¯ B 0 s → D − D + s decay to be 1.52 ± 0.15 ± 0.01 ps .
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