A search for 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 mixing is obtained by identifying subsamples of events having a 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 at the 95% confidence limit (95% CL). Combining with the ALEPH -based analyses yields at 95% CL.
Search for Bs0 oscillations using inclusive lepton events / R. Barate et al.; E. Focardi; V.Ciulli. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - ELETTRONICO. - 7:(1999), pp. 553-569. [10.1007/s100529901108]
Search for Bs0 oscillations using inclusive lepton events
FOCARDI, ETTORE;CIULLI, VITALIANO
1999
Abstract
A search for 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 mixing is obtained by identifying subsamples of events having a 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 at the 95% confidence limit (95% CL). Combining with the ALEPH -based analyses yields at 95% CL.
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