Subjects in Particle Physics Theory Group 1 [ Kanemura Group ]

The standard model for particle physics is a good theory which can explain most of the phenomena at high energy experiments. However, today we know that there are several phenomena which cannot be described in the standard model, such as the matter-antimatter asymmetry of the Universe (baryon asymmetry of the Universe), dark matter, origin of tiny mass of neutrinos, cosmic inflation, dark energy etc. Clearly new theory is necessary to explain such new physics beyond the standard model. Main subject in our group is to explore a new more fundamental and more unified theory to explain such new physics phenomena.

The standard model for particle physics is composed of two important notions, the gauge principle which explains interaction among particles and the spontaneous breaking of electroweak symmetry which explains mass of particles. More than fifty years have passed since the first proposal of the standard model. For such a long time, the gauge principle has been tested thoroughly by experiments and has already established, while the part of electroweak symmetry breaking in the standard model does not have theoretically compelling principle and there are possibilities that the Higgs sector takes a different shape from the standard model one. The Higgs particle which gives mass of particles was just discovered at CERN LHC only 10 years ago, and its detailed properties are still in mystery. The hypothesis that physics of electroweak symmetry breaking (Higgs physics) is closely related to new physics beyond the standard model is a natural hypothesis.

We are interested in such a hypothesis, and we are often making theoretical study and research along with this line. Assuming that the Higgs physics is a key probe of new physics and using theoretical insights and inputs from experiments, we theoretically explore new theory models beyond the standard model, by which we try to explain various BSM phenomena at early Universe. Furthermore, we always try to extend our scope to search for important and interesting new subjects looking at entire fields of particle phenomenology and particle cosmology.

Our recent subjects include the followings:

1. Theoretical study of new models of electroweak symmetry breaking.
2. Theoretical study of collider phenomena based on new physics modes beyond the standard model.
3. Systematic studies on theory of renormalization and radiative corrections in various extended Higgs models.
4. Theoretical studies on new models of electroweak baryogenesis.
5. Theory of phase transition, and its test using future collider experiments, space-based observations of gravitational waves and those of primordial blackholes.
6. Models of light WIMP dark matter and its phenomenology.
7. Exploring new models to explain tiny neutrino masses.

• Publications by Shinya Kanemura（INSPIRE）
• Research map