Measurements of the $B_s^0$ and $\Lambda_b^0$ lifetimes

This paper presents updated measurements of the lifetimes of the B^0_s meson and the \Lambda_b baryon using 4.4 million hadronic Z^0 decays recorded by the OPAL detector at LEP from 1990 to 1995. A sample of B^0_s decays is obtained using D_s^- \ell^+ combinations, where the D_s^- is fully reconstructed in the \phi \pi^-, K^*0 K^- and K^- K^0_S decay channels and partially reconstructed in the \phi \ell^- \nu(bar) X decay mode. A sample of \Lambda_b decays is obtained using \Lambda_c^+ \ell^- combinations, where the \Lambda_c^+ is fully reconstructed in its decay to a p K^- \pi^+ final state and partially reconstructed in the \Lambda \ell^+ \nu X decay channel. From 172 +/- 28 D_s^- \ell^+ combinations attributed to B^0_s decays, the measured lifetime is \tau(B^0_s) = 1.50 +0.16 -0.15 +/- 0.04 ps, where the errors are statistical and systematic, respectively. From the 129 +\- 25 \Lamda_c^+ \ell^- combinations attributed to \Lambda_b decays, the measured lifetime \tau(\Lambda_b) = 1.29 +0.24 -0.22 +/- 0.06 ps, where the errors are statistical and systematic, respectively.

Note:

21 pages, LaTeX, uses a4p.sty, 4 eps figures included, submitted to Phys. Lett. B Report-no: CERN-PPE/97-159

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
Lambda/b0: semileptonic decay
Lambda/b0: lifetime
B/s0: semileptonic decay
B/s0: lifetime
D/s-: decay modes
K*(892)

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Measurements of the Bs0B_s^0Bs0​ and Λb0\Lambda_b^0Λb0​ lifetimes

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Measurements of the $B_s^0$ and $\Lambda_b^0$ lifetimes