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Theoretical status of Bs-mixing and lifetimes of heavy hadrons.

Lenz, Alexander (2008) 'Theoretical status of Bs-mixing and lifetimes of heavy hadrons.', Nuclear Physics B. Proceedings supplements., 177-178 . pp. 81-86.


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.

Item Type:Article
Full text:(NA) Not Applicable
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Date accepted:07 December 2007
Date deposited:No date available
Date of first online publication:06 March 2008
Date first made open access:No date available

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