Abstract
Standard Model fails to explain neutrino oscillations, dark matter, and baryon asymmetry of the Universe. All these problems can be solved with three sterile neutrinos added to SM. Quite remarkably, if sterile neutrino masses are well below the electroweak scale, this modification—Neutrino Minimal Standard Model (νMSM)—can be tested experimentally. We discuss a new experiment on search for decays of GeV-scale sterile neutrinos, which are responsible for the matter-antimatter asymmetry generation and for the active neutrino masses. If lighter than 2 GeV, these particles can be produced in decays of charm mesons generated by high energy protons in a target, and subsequently decay into SM particles. To fully explore this sector ofνMSM, the new experiment requires data obtained with at least1020incident protons on target (achievable at CERN SPS in future) and a big volume detector constructed from a large amount of identical single modules, with a total sterile neutrino decay length of few kilometers. The preliminary feasibility study for the proposed experiment shows that it has sensitivity which may either lead to the discovery of new particles below the Fermi scale—right-handed partners of neutrinos—or rule out seesaw sterile neutrinos with masses below 2 GeV.
Highlights
The discovery of neutrino oscillations provides an undisputed signal that the Standard Model SM of elementary particles is not complete
The answer is affirmative: an economic way to handle in a unified way the problems of neutrino masses, dark matter, and baryon asymmetry of the Universe is to add to the SM three Majorana singlet fermions with masses roughly of the order of masses of known quarks and leptons
The energy scale of new physics is not known. If it exists at energies above the Fermi scale examples include supersymmetry, large or warped extra dimensions, and models with dynamical electroweak symmetry breaking, the search for new particles can be carried out in direct experiments, such as ATLAS and CMS at LHC
Summary
The discovery of neutrino oscillations provides an undisputed signal that the Standard Model SM of elementary particles is not complete. Suppose that the LHC finds no new particle and no deviations from the Standard Model In this case the “naturalness paradigm”, leading the theoretical research over the last few decades will be much less attractive, as the proposals for new physics stabilizing the electroweak scale by existence of new particles in the TeV region and based on low energy supersymmetry, technicolor or large extra dimensions would require severe fine-tunings. The answer is affirmative: an economic way to handle in a unified way the problems of neutrino masses, dark matter, and baryon asymmetry of the Universe is to add to the SM three Majorana singlet fermions with masses roughly of the order of masses of known quarks and leptons This theory is called the νMSM, for “Neutrino Minimal Standard Model” for a review see 6.
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