with μ → eγ
نویسنده
چکیده
Extending the Minimal Supersymmetric Standard Model with three righthanded neutrino superfields is one of the best motivated scenarios for physics beyond the Standard Model. However, very little is known from observations about the high energy parameters of this model. In this paper we show, under the plausible assumptions that the neutrino Yukawa eigenvalues are hierarchical and the absence of cancellations, that there exists an upper bound on the smallest Yukawa eigenvalue stemming from the non-observation of the rare lepton decay μ → eγ. Furthermore, we show that this bound implies an upper bound on the lightest right-handed neutrino mass of approximately 5×1012 GeV for typical supersymmetric parameters. We also discuss the implications of this upper bound for the leptogenesis mechanism and we argue that an improvement of sensitivity of five orders of magnitude to the process μ → eγ could rule out thermal leptogenesis as the origin of the observed baryon asymmetry. March 2009 TUM-HEP 713/09 ∗E-mail addresses: [email protected], [email protected]
منابع مشابه
Determining the sign of μ and constraining tan β with μ → eγ and μ - e conversion in nuclei Carlos
We show that, in the MSSM with msugra boundary conditions and seesaw induced neutrino masses, the values of BR(μ → eγ) and the μ-e conversion rate in a nucleus determine the sign of μ and constrain tan β in a model independent way.
متن کاملSolar and Atmospheric Neutrino Oscillations and Lepton Flavor Violation in Supersymmetric Models with the Right - handed Neutrinos
Taking the solar and the atmospheric neutrino experiments into account we discuss the lepton flavor violating processes, such as τ → μγ or μ → eγ, in the minimal supersymmetric standard model with the right-handed neutrinos (MSSMRN) and the supersymmetric SU(5) GUT with the righthanded neutrinos (SU(5)RN). The predicted branching ratio of μ → eγ in the MSSMRN with the MSW large angle solution i...
متن کاملSolar and Atmospheric Neutrino Oscillations and Lepton Flavor Violation in Supersymmetric Models with Right-handed Neutrinos
Taking the solar and the atmospheric neutrino experiments into account we discuss the lepton flavor violating processes, such as τ → μγ or μ → eγ, in the minimal supersymmetric standard model with right-handed neutrinos (MSSMRN) and the supersymmetric SU(5) GUT with righthanded neutrinos [SU(5)RN]. The predicted branching ratio of μ → eγ in the MSSMRN with the Mikheyev-Smirnov-Wolfenstein (MSW)...
متن کاملµ → eγ AND µ → 3e PROCESSES WITH POLARIZED MUON AND SUPERSYMMETRIC GRAND UNIFIED THEORIES a
Lepton flavor violating processes μ → eγ and μ → 3e with polarized muons are studied in the supersymmetric grand unified theory (SUSY GUT). As a result of a detailed numerical calculation, it is shown that the Pand T-odd asymmetries defined with the help of the muon polarization and the ratio of two branching fractions make a good contrast between the SU(5) and SO(10) SUSY GUT. These observable...
متن کاملLow-scale standard supersymmetric leptogenesis
Strictly adhering to the standard supersymmetric seesaw mechanism, we present a neutrino mass model which allows successful standard thermal leptogenesis compatible with gravitino cosmology. Some neutrino Yukawa couplings are naturally much larger than the näıve estimates following from the seesaw formula. This leads to large BR(μ → eγ), detectable in the next round of experiments. Ratios of μ ...
متن کاملCharged Lepton Flavor Violation in Supersymmetry with Bilinear R–Parity Violation
The simplest unified extension of the Minimal Supersymmetric Standard Model with bi-linear R–parity violation naturally predicts a hierarchical neutrino mass spectrum, suitable to explain atmospheric and solar neutrino fluxes. We study whether the individual violation of the lepton numbers Le,μ,τ in the charged sector can lead to measurable rates for BR(μ → eγ) and BR(τ → μγ). We find that some...
متن کامل