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.

D., B., I., D., D., D., P., G., C., G., J. P., L., et al. (1996). Study of the B(s)0 anti-B(s)0 oscillation frequency using D(s)- l+ combinations in Z decays. PHYSICS LETTERS. SECTION B, 377, 205-221 [10.1016/0370-2693(96)00451-0].

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

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
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
D., B., I., D., D., D., P., G., C., G., J. P., L., et al. (1996). Study of the B(s)0 anti-B(s)0 oscillation frequency using D(s)- l+ combinations in Z decays. PHYSICS LETTERS. SECTION B, 377, 205-221 [10.1016/0370-2693(96)00451-0].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/38859
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