Skip to main content

Research Repository

Advanced Search

Theoretical status of Bs-mixing and lifetimes of heavy hadrons

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


Alexander Lenz

R. Castaldi

G. Chiarelli

F Forti

A. Scribano


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.


Lenz, A., Castaldi, R., Chiarelli, G., Forti, F., & Scribano, A. (2008). Theoretical status of Bs-mixing and lifetimes of heavy hadrons. .

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
Additional Information Conference dates: 20–26 May 2007


You might also like

Downloadable Citations