Lepton flavour violation in e^{\pm}e^{-}\to \ell^{\pm}e^{-} (\ell = μ,τ) induced by R-conserving supersymmetry

Abstract

The lepton flavour violating signals $e^{+}{e}^{-}\to {\ell }^{+}{e}^{-}$ and $e^{-}{e}^{-}\to {\ell }^{-}{e}^{-}(\ell =\mu ,\tau )$ are studied in the context of low energy R-parity conserving supersymmetry at center of mass energies of interest for the next generation of linear colliders. Loop level amplitudes receive contributions from electroweak penguin and box diagrams involving sleptons and gauginos. Lepton flavour violation is due to off diagonal elements in $SU(2{)}_L$ doublet slepton mass matrix. These masses are treated as model independent free phenomenological parameters in order to discover regions in parameter space where the signal cross section may be observable. The results are compared with (a) the experimental bounds from the non-observation of rare radiative lepton decays $\mu ,\tau \to e\gamma$ and (b) the general mSUGRA theoretical scenario with seesaw mechanism where off diagonal slepton matrix entries are generated by renormalization group evolution of neutrino Yukawa couplings induced by the presence of new energy scales set by the heavy $SU(2{)}_L$ singlet neutrino masses. It is found that in $e^{-}{e}^{-}$ collisions the ($e\tau$) signal can be observable with a total integrated luminosity of 100 fb${}^{-1}$ and the that the background can be easily suppressed. In $e^{+}{e}^{-}$ collisions the cross section is smaller and higher luminosities are needed. The experimental bound on the decay $\mu \to e\gamma$ prevents the ($e\mu$) signal from being observable.

14 pages, 12 figures, Revtex4

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• Seesaw and Lepton Flavour Violation in SUSY SO(10)
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• Search for Lepton Flavor Violation Process e^+e^- \to eμin the Energy Region \sqrt{s}=984 -- 1060 MeV and ϕ\to eμDecay
• Analysis of Lepton Flavor Violating τ^\pm \to μ^\pm μ^\pm μ^\mp Decays
• Probing Lepton Flavor Violation Signal Induced by R-violating Minimal Supersymmetric Standard Model at a Linear Collider
• Supersymmetric Higgs mediated lepton flavor violation at a Photon Collider
• Suppression of Lepton Flavour Violation from Quantum Corrections above $M_{GUT}$
• Lepton Flavor Violating tau --> 3mu Decay in Type-III Two Higgs Doublet Model
• Generation Mixing of Sneutrinos in Heavier Chargino Decay
• Lepton flavor violating signals of the LHT model via e^{+}e^{-} and γγcollisions at the ILC