English

Implications of Recent Data on Neutrino Mixing and Lepton Flavour Violating Decays for the Zee Model

High Energy Physics - Phenomenology 2015-06-03 v2 High Energy Physics - Experiment

Abstract

We study implications of recent data on neutrino mixing from T2K, MINOS, Double Chooz and μeγ\mu \to e \gamma from MEG for the Zee model. The simplest version of this model has been shown to be ruled out by experimental data some time ago. The general Zee model is still consistent with recent data. We demonstrate this with a constrained Zee model based on naturalness consideration. In this constrained model, only inverted mass hierarchy for neutrino masses is allowed, and θ13\theta_{13} must be non-zero in order to have correct ratio for neutrino mass-squared differences and for mixing in solar and atmospherical neutrino oscillations. The best fit value of our model for θ13\theta_{13} is 8.91deg8.91\deg from T2K and MINOS data, very close to the central value obtained by Double Chooz experiment. There are solutions with non-zero CP violation with the Jarlskog parameter predicted in the range ±0.039\pm 0.039, ±0.044\pm 0.044 and ±0.048\pm 0.048 respectively for a 1σ\sigma, 2σ\sigma and 3σ\sigma ranges of other input parameters. However, without any constraint on the θ13\theta_{13}-parameter above respective ranges become ±0.049\pm 0.049, ±0.053\pm 0.053 and ±0.056\pm 0.056. We analyse different cases to obtain a branching ratio for μeγ\mu \to e \gamma close to the recent MEG bound. We also discuss other radiative as well as the charged trilepton flavour violating decay modes of the τ\tau-lepton.

Keywords

Cite

@article{arxiv.1111.2293,
  title  = {Implications of Recent Data on Neutrino Mixing and Lepton Flavour Violating Decays for the Zee Model},
  author = {Xiao-Gang He and Swarup Kumar Majee},
  journal= {arXiv preprint arXiv:1111.2293},
  year   = {2015}
}

Comments

References added, one extra figure added, typos corrected, few more related phenomenology discussion added/modified; 25 pages, 10 figures