How many new particles do we need after the Higgs boson?

Abstract

The discovery of the scalar boson completes the experimental confirmation of the particles predicted by the Standard Model, which achieves to describe almost all phenomena observed in nature in terms of a few symmetry principles and a handful of numbers, the constants of nature. Neutrino oscillations are the only confirmed piece of evidence for physics beyond the Standard Model found in the laboratory. They can easily be explained if the neutrinos have partners with right handed chirality like all other fermions. Remarkably, right handed neutrinos can simultaneously explain long standing puzzles from cosmology, namely Dark Matter and the baryon asymmetry of the universe. I discuss how close this minimal extension of the Standard Model by right handed neutrinos can bring us to a complete theory of nature and what else may be needed.

References added, footnote added, 8 pages, 2 figures. Contribution to the proceedings of the 49th Rencontres de Moriond on Electroweak Interactions and Unified Theories (2014)

References in corpus (35)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• The Standard Model Higgs boson as the inflaton
• Light Sterile Neutrinos: A White Paper
• Matter and Antimatter in the Universe
• Inflation scenario via the Standard Model Higgs boson and LHC
• The Sphaleron Rate in the Minimal Standard Model
• How to find neutral leptons of the nuMSM?
• A possible symmetry of the $\nu$MSM
• Higgs inflation at the critical point
• Sterile Neutrinos as the Origin of Dark and Baryonic Matter
• Higgs inflation still alive
• Where to find a dark matter sterile neutrino?
• Realistic sterile neutrino dark matter with keV mass does not contradict cosmological bounds
• Resonantly-Produced 7 keV Sterile Neutrino Dark Matter Models and the Properties of Milky Way Satellites
• Direct X-ray Constraints on Sterile Neutrino Warm Dark Matter
• Search for Majorana neutrinos in $B^{-}\to {\pi }^{+}{\mu }^{-}{\mu }^{-}$ decays
• Constraints on Sterile Neutrino Dark Matter
• Low Energy Signatures of the TeV Scale See-Saw Mechanism
• Thermal production of relativistic Majorana neutrinos: Strong enhancement by multiple soft scattering
• Constraining DM properties with SPI
• Constraints on the parameters of radiatively decaying dark matter from the dark matter halo of the Milky Way and Ursa Minor
• Restrictions on parameters of sterile neutrino dark matter from observations of galaxy clusters
• Limits on the Radiative Decay of Sterile Neutrino Dark Matter from the Unresolved Cosmic and Soft X-ray Backgrounds
• Strong Upper Limits on Sterile Neutrino Warm Dark Matter
• Medium corrections to the CP-violating parameter in leptogenesis
• Probing leptogenesis with GeV-scale sterile neutrinos at LHCb and BELLE II
• The Sphaleron Rate through the Electroweak Cross-over
• Systematic approach to thermal leptogenesis
• Leptogenesis: The Other Cuts
• Probing the nature of dark matter with Cosmic X-rays: Constraints from "Dark blobs" and grating spectra of galaxy clusters
• Quantum corrections to leptogenesis from the gradient expansion
• Resonant production of the sterile neutrino dark matter and fine-tunings in the [nu]MSM
• Lepton Universality Test of Extra Leptons using Hadron Decay
• Decaying dark matter in Draco