# Measurement of the B$^0_s$ lifetime and production rate with D$^-_s l^+$ combinations in Z decays

Abstract : The lifetime of the \bs meson is measured in approximately 3 million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1994. Seven different \ds decay modes were reconstructed and combined with an opposite sign lepton as evidence of semileptonic \bs decays. Two hundred and eight \dsl candidates satisfy selection criteria designed to ensure precise proper time reconstruction and yield a measured \bs lifetime of \mbox{\result .} Using a larger, less constrained sample of events, the product branching ratio is measured to be \mbox{\pbrresult .
Document type :
Journal articles

Cited literature [13 references]

http://hal.in2p3.fr/in2p3-00003639
Submitted on : Monday, May 17, 1999 - 1:22:42 PM
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### Identifiers

• HAL Id : in2p3-00003639, version 1

### Citation

D. Buskulic, D. Casper, I. de Bonis, D. Decamp, P. Ghez, et al.. Measurement of the B$^0_s$ lifetime and production rate with D$^-_s l^+$ combinations in Z decays. Physics Letters B, Elsevier, 1995, 361, pp.221-233. ⟨in2p3-00003639⟩

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