Lepton-flavor mixing and K → πνν̄ decays

Yuval Grossman, Gino Isidori, Hitoshi Murayama

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The impact of possible sources of lepton-flavor mixing on K→πνν̄ decays is analysed. At the one-loop level lepton-flavor mixing originated from non-diagonal lepton mass matrices cannot generate a CP-conserving KL→π0νν̄ amplitude. The rates of these modes are sensitive to leptonic flavor violation when there are at least two different leptonic mixing matrices. New interactions that violate both quark and lepton universalities could enhance the CP-conserving component of Γ(KL→π 0νν̄) and have a substantial impact. Explicit examples of these effects in the context of supersymmetric models, with and without R-parity conservation, are discussed.

Original languageEnglish
Pages (from-to)74-80
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - 20 May 2004
Externally publishedYes

Bibliographical note

Funding Information:
We thank the organizers of the Workshop On CKM Unitarity Triangle at CERN, 13–16 February 2002, Geneva, Switzerland, where this work has started. We thank Yossi Nir and Gilad Perez for useful discussions. The work of Y.G. is supported in part by the Department of Energy, contract DE-AC03-76SF00515 and by the Department of Energy under grant No. DE-FG03-92ER40689. G.I. acknowledges the hospitality of the Theory Group at SLAC, where part of this work has been done, and a partial support from the EC IHP-RTN program, contract No. HPRN-CT-2002-00311 (EURIDICE). The work of H.M. was supported by Institute for Advanced Study, funds for Natural Sciences. H.M. was also supported in part by the DOE Contract DE-AC03-76SF00098 and in part by the NSF grant PHY-0098840.


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