Lepton flavor violation in muonium decay and muon colliders in models with heavy neutrinos

G. Cvetič, C. Dib, C. S. Kim, J. D. Kim

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Abstract

We study the lepton-flavor-violating reaction μ+e-→e+e- within two extensions of the standard model that include heavy neutrinos. The reaction is studied in the low energy limit in the form of muonium decay M→e+e- and in the high energy regime of a muon collider. The two theoretical models we consider are: model I, a typical seesaw model that violates lepton flavor and number by inclusion of extra right-handed neutrinos; and model II, a variant where lepton number is conserved and which includes extra right-handed as well as left-handed neutrinos, singlets under the gauge group. We find for muonium decay into e+e- the extremely small result Br(M→e+e-)<10-19 in both scenarios. Alternatively, for μ+e- collisions up to s∼50GeV, we find σ(μ+e-→e+e-)<10-5 fb, while for energies above the W+W- threshold we find σ(μ+e-→W+W-) up to ∼1 fb.

Original languageEnglish
Article number093011
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume74
Issue number9
DOIs
Publication statusPublished - 2006 Dec 6

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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