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

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doi:10.1007/s100529901108

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 / 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., Boix, G., Casado, M.p., Chmeissani, M., Crespo, J.m., Delfino, M., Fernandez, E., Fernandez Bosman, M., Garrido, L., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 7:4(1999), pp. 553-569. [10.1007/s100529901108]