Direct limits on the B0(s) oscillation frequency.

Borissov, Guennadi and Bertram, I. A. and Fox, H. and Ratoff, Peter N. (2006) Direct limits on the B0(s) oscillation frequency. Physical review letters, 97. 021802. ISSN 1079-7114

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We report results of a study of the B oscillation frequency using a large sample of B semileptonic decays corresponding to approximately 1 fb-1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider in 2002–2006. The amplitude method gives a lower limit on the B oscillation frequency at 14.8 ps-1 at the 95% C.L. At ms=19 ps-1, the amplitude deviates from the hypothesis =0 (1) by 2.5 (1.6) standard deviations, corresponding to a two-sided C.L. of 1% (10%). A likelihood scan over the oscillation frequency, ms, gives a most probable value of 19 ps-1 and a range of 17<ms<21 ps-1 at the 90% C.L., assuming Gaussian uncertainties. This is the first direct two-sided bound measured by a single experiment. If ms lies above 22 ps-1, then the probability that it would produce a likelihood minimum similar to the one observed in the interval 16–22 ps-1 is (5.0±0.3)%.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
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Borissov co-led the analysis and supervised the paper. He developed the selection and the essential method for flavour tagging. This was a first observation with an upper bound and excluded large new physics differences from expectations. Has had a major impact on the field resulting in 166 citations (SPIRES). RAE_import_type : Journal article RAE_uoa_type : Physics
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?? physics and astronomy(all)qc physics ??
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Deposited On:
02 Apr 2008 13:30
Last Modified:
23 Jan 2024 01:45