An Improved measurement of the $B_s^0$ lifetime

This letter presents an updated measurement of the lifetime of the B s 0 meson using 3.6 million hadronic Z 0 decays recorded by the OPAL detector at LEP from 1990 to 1994. A sample of B s 0 decays is obtained using D s − ℓ + combinations, where the D s − is reconstructed in either the φπ − or K ∗0 K − decay mode. From 79 ± 13 D x ℓ combinations attributed to B s 0 decays in this data sample, we measure τ (B s 0 ) = 1.54 −0.21 +0.25 ± 0.06 ps, where the errors are statistical and systematic, respectively.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: nonleptonic decay
nonleptonic decay: Z0
mass spectrum: (K+ K- pi-)
(K+ K- pi-): mass spectrum

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