Phenomenological applications of the 1 N expansion

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The main aspects of the 1 N approach to non-leptonic weak interactions developed in collaboration with Bardeen and Gérard are reviewed in detail. The results for the hadronic matrix elements relevant for K → ππ decays, K0 - K0 mixing and CP violation in the K-system are presented. The implications of these results for the ΔI = 1 2 rule in K → ππ decays and the CP violating parameters ε and ε′ are discussed in detail. It is pointed out that the mass of the top quark (mt) should not be too large for the standard model to be able to fit the recent NA31 data for ε′/ε. An upper bound for mt is found as a function of various non-perturbative parameters. Typically mt < 90 GeV is required. Implications of the B0 - B0 mixing for ε′/ε and the value of mt are discussed.

Original languageEnglish
Pages (from-to)199-267
Number of pages69
JournalNuclear Physics B (Proceedings Supplements)
Issue number1
StatePublished - Jul 1989
Externally publishedYes


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