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 language | English |
|---|---|
| Article number | 093011 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 74 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 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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Lepton flavor violation in muonium decay and muon colliders in models with heavy neutrinos. / Cvetič, G.; Dib, C.; Kim, C. S.; Kim, J. D.
In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 74, No. 9, 093011, 06.12.2006.Research output: Contribution to journal › Article
TY - JOUR
T1 - Lepton flavor violation in muonium decay and muon colliders in models with heavy neutrinos
AU - Cvetič, G.
AU - Dib, C.
AU - Kim, C. S.
AU - Kim, J. D.
PY - 2006/12/6
Y1 - 2006/12/6
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevD.74.093011
DO - 10.1103/PhysRevD.74.093011
M3 - Article
AN - SCOPUS:33751505926
VL - 74
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 9
M1 - 093011
ER -