Theoretical status of Bs-mixing and lifetimes of heavy hadrons

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

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