Theoretical status of Bs-mixing and lifetimes of heavy hadrons

Lenz, Alexander; Castaldi, R.; Chiarelli, G.; Forti, F; Scribano, A.

doi:10.1016/j.nuclphysbps.2007.11.089

Theoretical status of Bs-mixing and lifetimes of heavy hadrons

Lenz, Alexander; Castaldi, R.; Chiarelli, G.; Forti, F; Scribano, A.

Authors

Alexander Lenz

R. Castaldi

G. Chiarelli

F Forti

A. Scribano

Abstract

We review the theoretical status of the lifetime ratios τB+/τBd, τBs/τBd, τΛb/τBd and τBc and of the mixing quantities ΔMs, ΔΓs and ϕs. ΔMs and ΔΓs suffer from large uncertainties due to the badly known decay constants, while the ratio ΔΓs/ΔMs can be determined with almost no non-perturbative uncertainties, therefore it can be used perfectly to find possible new physics contributions in the mixing parameters. We suggest a very clear method of visualizing the bounds on new physics and demonstrate this by combining the latest experimental numbers on the mixing quantities quantities with theory – one already gets some hints for new physics contributions, but more precise experimental numbers are needed to draw some definite conclusions. We conclude with a ranking list of all the discussed quantities according to their current theoretical uncertainties and point out possible improvements.

Citation

Lenz, A., Castaldi, R., Chiarelli, G., Forti, F., & Scribano, A. (2008). Theoretical status of Bs-mixing and lifetimes of heavy hadrons. . https://doi.org/10.1016/j.nuclphysbps.2007.11.089

Conference Name	Hadron Collider Physics Symposium 2007.
Conference Location	La Biodola, Isola d’Elba, Italy
Acceptance Date	Dec 7, 2007
Online Publication Date	Mar 6, 2008
Publication Date	Mar 6, 2008
Deposit Date	Dec 7, 2015
Publicly Available Date	Mar 30, 2016
Volume	177-178
Pages	81-86
Series ISSN	0920-5632
DOI	https://doi.org/10.1016/j.nuclphysbps.2007.11.089
Additional Information	Conference dates: 20–26 May 2007