A lower limit on the oscillation frequency of the <B-s(0)(B)over bar (0)(s)> 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 D-s(-) 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 D(s)(-)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)(B)over bar (0)(s)> 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(s) = 1.54(-0.13)(0.14) (stat) +/- 0.04 (syst) ps.

Study of the B-s(0)(B)over-bar(s)(0) oscillation frequency using D(s)(-)l(+) combinations in Z decays / 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, M., Crespo, J.m., Delfino, M., Efthymiopoulos, I., Fernandez, E., Fernandezbosman, M., Garrido, L., Juste, A., Martinez, M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 377:1-3(1996), pp. 205-221. [10.1016/0370-2693(96)00451-0]

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

CREANZA, Donato Maria;GELAO, Gennaro;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
1996

Abstract

A lower limit on the oscillation frequency of the 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 D-s(-) 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 D(s)(-)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 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(s) = 1.54(-0.13)(0.14) (stat) +/- 0.04 (syst) ps.
1996
Study of the B-s(0)(B)over-bar(s)(0) oscillation frequency using D(s)(-)l(+) combinations in Z decays / 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, M., Crespo, J.m., Delfino, M., Efthymiopoulos, I., Fernandez, E., Fernandezbosman, M., Garrido, L., Juste, A., Martinez, M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 377:1-3(1996), pp. 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/11589/204
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