Oscillating neutrinos and μ→ e, γ

If neutrino masses and mixings are suitable to explain the atmospheric and solar neutrino fluxes, this amounts to contributions to FCNC processes, in particular mu --> e, gamma. If the theory is supersymmetric and the origin of the masses is a see-saw mechanism, we show that the prediction for BR(mu --> e, gamma) is in general larger than the experimental upper bound, especially if the largest Yukawa coupling is O(1) and the solar data are explained by a large angle MSW effect, which recent analyses suggest as the preferred scenario. Our analysis is bottom-up and completely general, i.e. it is based just on observable low-energy data. The work generalizes previous results of the literature, identifying the dominant contributions. Application of the results to scenarios with approximate top-neutrino unification, like SO(10) models, rules out most of them unless the leptonic Yukawa matrices satisfy very precise requirements. Other possible ways-out, like gauge mediated SUSY breaking, are also discussed.

Oscillating neutrinos and mu --> e, gamma

This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (search for hidden particles) experiment is intended to hunt for new physics in the largely unexplored domain of very weakly interacting particles with masses below the Fermi scale, inaccessible to the LHC experiments, and to study tau neutrino physics. The same proton beam setup can be used later to look for decays of tau-leptons with lepton flavour number non-conservation, $\tau \to 3\mu $ and to search for weakly-interacting sub-GeV dark matter candidates. We discuss the evidence for physics beyond the standard model and describe interactions between new particles and four different portals—scalars, vectors, fermions or axion-like particles. We discuss motivations for different models, manifesting themselves via these interactions, and how they can be probed with the SHiP experiment and present several case studies. The prospects to search for relatively light SUSY and composite particles at SHiP are also discussed. We demonstrate that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.

/pdf/a-facility-to-search-for-hidden-particles-at-the-cern-sps-3pxaggnjt6.pdf

A facility to search for hidden particles at the CERN SPS: the SHiP physics case.

Search for the Decay mu+ ---> e+ e+ e-

This article reviews the current theoretical and experimental status of the field of muon decay and its potential to search for new physics beyond the standard model. The importance of rare muon processes with lepton flavor violation is highly stressed, together with precision measurements of normal muon decay. Recent up-to-date motivations of lepton flavor violation based on supersymmetric models, in particular supersymmetric grand unified theories, are described along with other theoretical models. Future prospects of experiments and muon sources of high intensity for further progress in this field are also discussed.

Muon decay and physics beyond the standard model

Analysis of the rare allowed muon decay μ+→e+vev¯μe+e−

The SINDRUM-Spectrometer has measured the kinematical distribution of 7443±148 events of the rare muon decay μ → 3e2ν. The muons were (80 ± 2) % polarized and only the high energy region was investigated. This measurement was a byproduct in the search for the lepton number violating decay μ → 3e. The phase space for the μ → 3e2ν decay was reduced by a factor of ∼5.8 × 10–5 by the following cuts on the charged particle momenta: 


each momentum transverse to beam direction > 16 MeV/c


36° < θ < 144°, where θ is the azimuthal angle


total transverse momentum ≤ 45 MeV/c.



Reference [1] gives detailed description of the detector and of the data reduction.

Measurement and Analysis of the Rare Muon Decay μ+→ e+νēνμe+e-

Search for the decay μ+ → e+e+e−

Measurement of the decay π+→e+νee+e− and search for a light Higgs boson

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