A search for B-s(o) oscillations is performed using approximately 4 million Z --> q (q) over bar events collected by the ALEPH experiment during 1991-1995. B-s(o) candidates are partially reconstructed by combining tracks with fully reconstructed D-s(-) candidates. The B-s(o) 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 B-s(o) purity estimated to be 22%, all values of Delta m(s) below 3.9 ps(-1) and between 6.5 and 8.8 ps(-1) are excluded at 95% CL. From the same sample, the B-s(o) lifetime is measured to be tau(s) = (1.47 +/- 0.14(stat) +/- 0.08(syst)) ps. This analysis selects mainly hadronic B-s(o) decays and is statistically independent of a previous ALEPH analysis selecting B-s(o) --> D-s((*)-) l(+) nu candidates. Combining these two analyses yields Delta m(s) > 7.9 ps(-1) at 95% CL and tau(s) = (1.51 +/- 0.11) ps.

R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1998). Study of B-s(0) oscillations and lifetime using fully reconstructed D-s(-) decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 4(3), 367-385 [10.1007/s100520050215].

Study of B-s(0) oscillations and lifetime using fully reconstructed D-s(-) decays

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1998-01-01

Abstract

A search for B-s(o) oscillations is performed using approximately 4 million Z --> q (q) over bar events collected by the ALEPH experiment during 1991-1995. B-s(o) candidates are partially reconstructed by combining tracks with fully reconstructed D-s(-) candidates. The B-s(o) 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 B-s(o) purity estimated to be 22%, all values of Delta m(s) below 3.9 ps(-1) and between 6.5 and 8.8 ps(-1) are excluded at 95% CL. From the same sample, the B-s(o) lifetime is measured to be tau(s) = (1.47 +/- 0.14(stat) +/- 0.08(syst)) ps. This analysis selects mainly hadronic B-s(o) decays and is statistically independent of a previous ALEPH analysis selecting B-s(o) --> D-s((*)-) l(+) nu candidates. Combining these two analyses yields Delta m(s) > 7.9 ps(-1) at 95% CL and tau(s) = (1.51 +/- 0.11) ps.
1998
R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1998). Study of B-s(0) oscillations and lifetime using fully reconstructed D-s(-) 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/11365/37656
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