A lower limit on the oscillation frequency of the B(s)0-anti-B(s)0 system is obtained from approximately four million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1995. Leptons are combined with opposite sign Ds- candidates reconstructed in seven different decay modes as evidence of semileptonic B(s)0 decays. Criteria designed to ensure precise proper time reconstruction select 277 Ds-l+ combinations. The initial state of these B(s)0 candidates is determined using an algorithm optimized to efficiently utilise the tagging information available for each event. The limit at 95% confidence level on the B(s)0-anti-B(s)0 oscillation frequency is Delta m(s) > 6.6 ps(-1). The same data is used to update the measurement of the B(s)0 lifetime, tau(B(s)0) = 1.54 (-0.13)(+0.14) (stat) +/- 0.04 (syst) ps.

Study of the B(s)0 anti-B(s)0 oscillation frequency using D(s)- l+ combinations in Z decays

G. Batignani;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;MESSINEO, ALBERTO MARIA;TONELLI, GUIDO EMILIO;
1996-01-01

Abstract

A lower limit on the oscillation frequency of the B(s)0-anti-B(s)0 system is obtained from approximately four million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1995. Leptons are combined with opposite sign Ds- candidates reconstructed in seven different decay modes as evidence of semileptonic B(s)0 decays. Criteria designed to ensure precise proper time reconstruction select 277 Ds-l+ combinations. The initial state of these B(s)0 candidates is determined using an algorithm optimized to efficiently utilise the tagging information available for each event. The limit at 95% confidence level on the B(s)0-anti-B(s)0 oscillation frequency is Delta m(s) > 6.6 ps(-1). The same data is used to update the measurement of the B(s)0 lifetime, tau(B(s)0) = 1.54 (-0.13)(+0.14) (stat) +/- 0.04 (syst) ps.
1996
Buskulic, D.; Debonis, I.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J. P.; Lucotte, A.; Minard, M. N.; Odier, P.; Pietrzyk, B.; Casado, M. P.; Chmeissani,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828709
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