Measurement of the $B^0_s$ Lifetime and Study of $B^0_s - \overline{B^0_s}$ Oscillations using $D_{s}l$ Events

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Abreu , P. ; Adam , W. ; Adye , T. ; Adzic , P. ; Albrecht , Z. ; Alderweireld , T. ; Alekseev , G D. ; Alemany , R. ; Allmendinger , T. ; Allport , P P. ; Almehed , S. ; Amaldi , U. ; Amapane , N. ; Amato , S. ; Anassontzis , E G. ; Andersson , P. ; Andreazza , A. ; Andringa , S. ; Antilogus , P. ; Apel , W D. ; Arnoud , Y. ; Asman , B. ; Augustin , J.-E. ; Augustinus , A. ; Baillon , P. ; Bambade , P. ; Barao , F. ; Barbiellini , Guido ; Barbier , R. ; Bardin , D Yu. ... view all 523 authors (2000)
  • Publisher: Springer Verlag (Germany)
  • Subject: knowledge philosophy | epistemology | cognition | reasoning | [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex] | language | perception

Lifetime and oscillations of $\Bs$ mesons have been studied in eventswith a large transverse momentum lepton and a $\Ds$ of opposite electric charge the same hemisphere, selected from about 3.6 million hadronic $\Zz$decays accumulated by DELPHI between 1992 and 1995. \\The $\Bs$ lifetime and the fractional width difference between the two physical tau_{\Bs} = (1.42^{+0.14}_{-0.13}(stat.)\pm 0.03(syst.))~ps $\dgbs 0.46 ~\mbox{at the 95\% C.L.} n the latter result it has been assumed that $\tau_{\Bs}=\tau_{\Bd} $.\\Using the same sample, a limit on the mass difference between the physical$\mbox{B}^0_{\mathrm s}$ states has been set:\begin{eqnarray*} \begin{array}{ll}~~~~~~~~~~\dms 7.4 ~ \mbox{ps}^{-1}~\mbox{at the 95\% C.L.} & \\ \end{array} \end{eqnarray*}with a corresponding sensitivity equal to $8.1~ps^{-1}$.
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