Measurement of the $B_{S}^{0}$ meson lifetime using semileptonic decays

The lifetime of the

B_{S}^{0}

meson is measured using the semileptonic decay

B_{S}^{0} \to D_{S}^{-} l^{+} ν X .

The data sample consists of about

110 {pb}^{- 1}

p \bar{p}

collisions at

\sqrt{s} = 1.8 TeV

collected by the CDF detector at Fermilab. Four different

D_{S}^{-}

decay modes are reconstructed resulting in approximately 600

D_{S}^{-} l^{+}

signal events. The

B_{S}^{0}

meson lifetime is determined to be

τ {(B}_{S}^{0}) = (1.36 \pm {0.09}_{- 0.05}^{+ 0.06}) ps,

where the first and second uncertainties are statistical and systematic, respectively. The

B_{S}^{0}

meson decay length distribution is examined for a lifetime difference

Δ Γ / Γ

between the two mass eigenstates of the

B_{S}^{0}

meson. An upper limit of ΔΓ/Γ<0.83 is set at the 95% confidence level.

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Measurement of theBS0meson lifetime using semileptonic decays