Conveners
Neutrinos I
- Nobuchika Okada
The IceCube Neutrino Observatory detects high energy astrophysical neutrinos in two event topologies: tracks and cascades. Since the flavor composition of each event topology differs, tracks and cascades can be used to test the neutrino properties and the mechanisms behind the neutrino production in astrophysical sources. Assuming a conventional model for the neutrino production, the IceCube...
Due to IceCube, neutrino astrophysics is entering a new era, which will allow powerful new probes of both astrophysics and particle physics. We investigate new signatures from high-energy neutrinos in IceCube that can help discriminate among presently allowed scenarios.
We propose a simultaneous explanation of two recent anomalous observations at very different energy scales. The first one concerns hints of lepton flavor universality violation in rare B-meson decays, as observed by LHCb, and to some extent, by Belle and BaBar. The second anomaly is the observation made by the ANITA balloon experiment of two EeV upgoing air showers. Both these observations are...
The ANITA collaboration recently reported the detection of two anomalous upward-propagating extensive air showers exiting the Earth with relatively large emergence angles and energies in the range O(0.5−1) EeV. We interpret these two events as coming from the decay of a massive dark-matter candidate (mDM≳109 GeV) decaying into a pair of right-handed neutrinos. While propagating through the...
We have shown a new way of obtaining Leptogenesis at low-scale (i.e around TeV scale) through annihilating t-channel process. In order to show the working of the mechanism in a minimal model, we have shown the same in "Scotogenic" model where the Standard model is extended by a Z2 odd scalar doublet and three right-handed neutrinos.
The possibility of generating the baryon asymmetry of the Universe via
flavor oscillation in the early Universe is discussed. After the inflation, leptons are born in some states, travel in the medium, and are eventually projected onto flavor eigenstates due to the scattering via the Yukawa interactions. By using the Lagrangian of the Standard Model with the Majorana neutrino mass terms,...
