A possible symmetry of the νMSM

By M. Shaposhnikov. 2006

229 citations recorded by the source corpus.

To explain the dark matter and the baryon asymmetry of the Universe, the parameters of the �MSM (an extension of the Minimal Standard Model by three singlet neutrinos with masses smaller than the electroweak scale) must be fine-tuned: one of the masses should be in the O(10) keV region to provide a candidate for the dark-matter particle, while two other masses must be almost the same to enhance the CP-violating effects in the sterile neutrino oscillations leading to the baryon asymmetry. We show that a specifically defined global lepton-number symmetry, broken on the level of O(10 4 ) leads to the required pattern of sterile neutrino masses being consistent with the data on neutrino oscillations. Moreover, the existence of this symmetry allows to fix the flavour structure of couplings of singlet fermions to the particles of the Standard Model and indicates that their masses are likely to be smaller than O(1) GeV, opening a possibility of their search in decays of charmed, beauty and even K or �-mesons.

View Paper: https://www.semanticscholar.org/paper/669badc4f133175159f5beec70707fbd6de21117

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

Citations in the corpus

A White Paper on keV sterile neutrino Dark Matter (2016, background): “[320] T. Asaka, M. Laine and M. Shaposhnikov, Lightest sterile neutrino abundance within the nuMSM, JHEP 0701 (2007) 091, [hep-ph/0612182].”
Erratum and Addendum to: How to find neutral leptons of the νMSM? (2013, background): “• The upper limit on active-to-sterile mixing U(2) coming from the successful baryogenesis in the early Universe was adopted from [5].”
Neutrinoless double beta decay versus other probes of heavy sterile neutrinos (2019, background): “The stability of these textures can in principle be guaranteed by enforcing extra symmetries in the lepton sector [12, 13, 19, 22–24].”
Dark Matter, Baryogenesis and Neutrino Oscillations from Right Handed Neutrinos (2012, background): “Some speculations can be found in [6, 10, 44, 73].”
Sterile neutrinos in cosmology (2017, methodology): “nisms, where the natural scale is high (˛keV), but split downward to low mass scales by suppression mechanism. Examples of bottom-up mechanisms include two based on the avor symmetries of L e L L ˝ [66, 67] and Q 6 [68]. In other bottom-up models, neutrino masses are only produced via higher order ”