We extend the standard model by adding an extra generation of isosinglet up- and down-type quark pair which engage in weak interactions only via mixing with the three ordinary quark families. It is shown that the generalized 4×4 quark mixing matrix, which is necessarily nonunitary, leads to nonvanishing flavor changing neutral currents. We then proceed to investigate various distributions and total branching ratio of the inclusive B-->Xs+- (=e,μ) rare B decays in the context of this model. It is shown that the shapes of the differential branching ratio and forward-backward asymmetry distribution are very sensitive to the value of the model parameters which are constrained by the experimental upper bound on BR(B-->Xsμ+μ-). We also indicate that, for certain values of the dileptonic invariant mass, CP asymmetries up to 10% can be obtained. .
Theoretical High Energy Physics: MRST 2001
- Pub Date:
- November 2001
- Decays of bottom mesons;
- Models beyond the standard model;
- High Energy Physics - Phenomenology
- 10 pages, 5 figures, Talk given at 23rd Annual MRST (Montreal-Rochester-Syracuse-Toronto) Conference on High Energy Physics (MRST 2001), London, Ontario, Canada, 16-18 May 2001