A search for B0s oscillations is performed using approximately 4 million Z → qq̄ events collected by the ALEPH experiment during 1991-1995. B0s candidates are partially reconstructed by combining tracks with fully reconstructed D-s candidates. The B0s production flavour is estimated from the sign of the opposite hemisphere charge, a fragmentation kaon in the same hemisphere, or a lepton in the opposite hemisphere. From a total sample of 1620 candidates, with a B0s purity estimated to be 22%, all values of Δms below 3.9 ps-1 and between 6.5 and 8.8 ps-1 are excluded at 95% CL. From the same sample, the B0s lifetime is measured to be τs = 1.47 ± 0.14(stat) ± 0.08(syst) ps. This analysis selects mainly hadronic B0s decays and is statiscally independent of a previous ALEPH analysis selecting B0s → D(*)-s ℓ+ v candidates. Combining these two analyses yields Δms > 7.9 ps-1 at 95% CL and τs = 1.51 ± 0.11 ps.

Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1998). Study of B0s oscillations and lifetime using fully reconstructed D̄s decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 4(3), 367-385 [10.1007/s100520050215].

Study of B0s oscillations and lifetime using fully reconstructed D̄s decays

CARPINELLI, Massimo;
1998

Abstract

A search for B0s oscillations is performed using approximately 4 million Z → qq̄ events collected by the ALEPH experiment during 1991-1995. B0s candidates are partially reconstructed by combining tracks with fully reconstructed D-s candidates. The B0s production flavour is estimated from the sign of the opposite hemisphere charge, a fragmentation kaon in the same hemisphere, or a lepton in the opposite hemisphere. From a total sample of 1620 candidates, with a B0s purity estimated to be 22%, all values of Δms below 3.9 ps-1 and between 6.5 and 8.8 ps-1 are excluded at 95% CL. From the same sample, the B0s lifetime is measured to be τs = 1.47 ± 0.14(stat) ± 0.08(syst) ps. This analysis selects mainly hadronic B0s decays and is statiscally independent of a previous ALEPH analysis selecting B0s → D(*)-s ℓ+ v candidates. Combining these two analyses yields Δms > 7.9 ps-1 at 95% CL and τs = 1.51 ± 0.11 ps.
Articolo in rivista - Articolo scientifico
Physics
English
367
385
19
Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1998). Study of B0s oscillations and lifetime using fully reconstructed D̄s decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 4(3), 367-385 [10.1007/s100520050215].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390134
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