Theoretical status of the lifetime predictions: $(ΔΓ/ Γ)_{B_s}, τ_{B^+}/τ_{B_d}$ and $τ_{Λ_b}/τ_{B_d}$

Details Theoretical status of the lifetime predictions: $(ΔΓ/ Γ)_{B_s}, τ_{B^+}/τ_{B_d}$ and $τ_{Λ_b}/τ_{B_d}$ Theoretical status of the lifetime predictions: $(ΔΓ/ Γ)_{B_s}, τ_{B^+}/τ_{B_d}$ and $τ_{Λ_b}/τ_{B_d}$

2001-07-04

arxiv.org/abs/hep-ph/0107033v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Invited talk given at the International Conference on Flavor Physics in Zhang-Jia-Jie City, Hunan, China, May 31 - June 6,2001

Scientific paper

We give a review of the theoretical status of the lifetime predictions in the standard model. In case of $(\Delta \Gamma/ \Gamma)_{B_s}$ we are already in a rather advanced stage. We obtain $(\Delta\Gamma/\Gamma)_{B_s}=(9.3^{+3.4}_{-4.6})%$. It seems to be difficult to improve these errors substantially. In addition now some experimental results are available. For $\tau_{B^+}/\tau_{B_d}$ and $\tau_{\Lambda_b} / \tau_{B_d}$ the theoretical status is much less advanced and the discrepancy between experiment and theory still remains. We conclude with a what-to-do-list for theorists.

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