2003/06/18 by M. Cannoni, St. Kolb, O. Panella · 1 citation
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.68.096002
published as Phys.Rev. D68 (2003) 096002 · 14 pages, 12 figures, Revtex4
arxiv created 2003/06/18 · openalex publication_date 2003/11/06 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The lepton-flavor-violating signals e+e^\ensuremath-\ensuremath→l+e^\ensuremath- and e^\ensuremath-e^\ensuremath-\ensuremath→l^\ensuremath-e^\ensuremath-(l=\ensuremathμ,\ensuremathτ) 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 flavor violation is due to off-diagonal elements in a 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 nonobservation of rare radiative lepton decays \ensuremathμ,\stackrel\ensuremath→\ensuremathτe\ensuremathγ and (b) the general MSUGRA theoretical scenario with the 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^\ensuremath-e^\ensuremath- collisions the (e\ensuremathτ) signal can be observable with a total integrated luminosity of 100fb^\ensuremath-1 and the background can be easily suppressed. In e+e^\ensuremath- collisions the cross section is smaller and higher luminosities are needed. The experimental bound on the decay \stackrel\ensuremath→\ensuremathμe\ensuremathγ prevents the (e\ensuremathμ) signal from being observable.