Re-examination of the standard model in the light of B meson mixing

John Ellis, J. S. Hagelin, S. Rudaz

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We examine the consistency of the standard model in the light of recent evidence for Bd0 - Bd0 and possible Bs0 - Bs0 mixing. We find that a consistent determination of the Kobayashi-Maskawa angles is possible only if mt{greater-than or approximate}50 GeV. We confirm previous expectations that Bs0 - Bs0 mixing should be large,be large, though not necessarily maximal. The top quark contributions to KL → μ+μ- and to the KL-Ks mass difference are small. The observed value of the CP impurity parameter ε{lunate} in the K0-K0 system is now eas ily accommodated, while previous predictions for ε{lunate}′/ε{lunate} are essentially unchanged. We obtain significantly improved upper and lower bounds on the rate for K+→π+vv, which is expected to have a branching ratio of 1-8×10-10. Observation of this decay w would yield significant new constraints on the standard model.

Original languageEnglish (US)
Pages (from-to)201-206
Number of pages6
JournalPhysics Letters B
Issue number1-2
StatePublished - Jun 25 1987

Bibliographical note

Funding Information:
We would like to acknowledge valuable conversations with D. Cassel, M. Ferro-Luzzi, H. Fritzsch, K. Kleinknecht, W. Schmidt-Parzeval, H. Schrtider and E. Thorndike. One of us (SR) acknowledges the research support afforded by the US Department of Energy under contract No. DE-AC02-83ER40105 and by a Presidential Young Investigator Award supplemented by a grant from the Exxon Education Foundation.


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