Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-08-18
Phys.Rev.D74:093011,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 7 figures; new version recalculates the figures and results using the correlated bound on mu-e mixing from $B(\mu\to
Scientific paper
10.1103/PhysRevD.74.093011
We study the lepton-flavor-violating reaction $\mu^+ e^- \to e^+ e^-$ 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 $M\to e^+ e^-$ and in the high energy regime of a muon collider. The two theoretical models we consider are: model I, a typical see-saw 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 $Br(M\to e^+ e^-) < 10^{-19}$ in both scenarios. Alternatively, for $\mu^+ e^-$ collisions up to $\sqrt{s}\sim 50$ GeV we find $\sigma(\mu^+ e^- \to e^+ e^-)< 10^{-5}$ fb, while for energies above the $W^+ W^-$ threshold we find $\sigma(\mu^+ e^- \to W^+ W^-)$ up to 1 fb.
Cvetic Gorazd
Dib Claudio O.
Kim Choong-Sun
Kim Jungdae
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