A search for B-s(0) oscillations is performed using a sample of semileptonic b-hadron decays collected by the ALEPH experiment during 1991-95. Compared to previous inclusive lepton analyses, the proper time resolution and b-flavour mistag rate are significantly improved. Additional sensitivity to B-s(0) mixing is obtained by identifying subsamples of events having a B-s(0) purity which is higher than the average for the whole data sample. Unbinned maximum likelihood amplitude fits are performed to derive a lower limit of Delta m(s) > 9.5 ps(-1) at the 95% confidence limit (95% CL). Combining with the ALEPH D-s(-)-based analyses yields Delta m(s) > 9.6 ps(-1) at 95% CL.

Search for B-s(0) oscillations using inclusive lepton events

G. Batignani;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;FORTI, FRANCESCO;MESSINEO, ALBERTO MARIA;TONELLI, GUIDO EMILIO;
1999-01-01

Abstract

A search for B-s(0) oscillations is performed using a sample of semileptonic b-hadron decays collected by the ALEPH experiment during 1991-95. Compared to previous inclusive lepton analyses, the proper time resolution and b-flavour mistag rate are significantly improved. Additional sensitivity to B-s(0) mixing is obtained by identifying subsamples of events having a B-s(0) purity which is higher than the average for the whole data sample. Unbinned maximum likelihood amplitude fits are performed to derive a lower limit of Delta m(s) > 9.5 ps(-1) at the 95% confidence limit (95% CL). Combining with the ALEPH D-s(-)-based analyses yields Delta m(s) > 9.6 ps(-1) at 95% CL.
1999
Barate, R.; Buskulic, D.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J. P.; Lucotte, A.; Merle, E.; Minard, M. N.; Nief, J. Y.; Pietrzyk, B.; Alemany, R.; B...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828627
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