Study Of B-S(0)-(B-S(0))Over-Bar Oscillations And B-S(0) Lifetimes Using Hadronic Decays Of B-S(0) Mesons

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EUROPEAN PHYSICAL JOURNAL C（2000）

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Abstract

Oscillations of B-s(0) mesons have been studied in samples selected from about 3.5 million hadronic Z decays detected by DELPHI between 1992 and 1995. One analysis uses events in the exclusive decay channels: B-s(0) --> D(s)(-)pi (+) or D(s)(-)a(1)(+) and B-s(0) --> (D) over bar (0)K(-)pi (+) or (D) over bar (0)K(-)a(1)(+), where D decays are completely reconstructed. In addition, B-s(0)-(B) over bar (0)(s) oscillations have been studied in events with an exclusively reconstructed D, accompanied in the same hemisphere by a high momentum hadron of opposite charge. Combining the two analyses, a limit on the mass difference between the physical B-s(0) states has been obtained:Deltam(Bs0) > 4.0 ps(-1) at the 95% C.L.with a sensitivity of Deltam(Bs0) = 3.2 ps(-1)Using the latter sample of events, the B-s(0) lifetime has been measured and an upper limit on the decay width difference between the two physical B-s(0) states has been obtained:tau (Bs0) = 1.53(-0.15)(+0.16)(stat.) +/- 0.07(syst.) psDelta Gamma (Bs0)/Gamma (Bs0) < 0.69 at the 95% C.L.The combination of these results with those obtained using D(s)(+/-)l(+/-) sample gives:Deltam(Bs0) > 4.9 ps(-1) at the 95% C.L.with a sensitivity of Deltam(Bs0) = 8.7 ps(-1)tau (Bs0) = 1.46 +/- 0.11 ps and Delta Gamma (Bs0)/Gamma (Bs0) < 0.45 at the 95% C.L.

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Key words

hadronic decays,lifetimes,oscillations

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