### Conveners

#### Neutrino #2

- Itaru Shimizu (Tohoku University)

Martin Hirsch
(IFIC (CSIC, Universidad de Valencia))

9/9/19, 2:00 PM

Neutrinos

Oral presentation in parallel session

Majorana neutrino masses can be generated in a variety of ways. The simplest possibility is to open the d=5 Weinberg operator at tree-level. This leads to the three well-known variants of the seesaw mechanism. However, the smallness of the observed neutrino masses can also be understood, if neutrino masses are generated by higher-dimensional operators and/or at higher loop level. In this talk...

Anjan Giri
(IIT Hyderabad)

9/9/19, 2:20 PM

Neutrinos

Oral presentation in parallel session

Leptogenesis is believed to be contributing to the baryon asymmetry of the Universe through baryogenesis. We consider a simple framework to understand the same with the extension of standard model with $S_3$ and $Z_2$ symmetry. We add two scalar triplets and right-handed neutrinos to explain the neutrino data. Moreover, we consider both type-I and type-II seesaw framework with scalar triplets...

Mr
Hisashi Okui
(Niigata University)

9/9/19, 2:40 PM

Neutrinos

Oral presentation in parallel session

Right-handed neutrinos are particles beyond the SM introduced in the seesaw mechanism that can explain tiny neutrino masses. We revisit the entropy production from the decay of right-handed neutrinos with the GeV scale masses. This additional production of entropy dilutes the DM and baryon abundances. Furthermore, we estimate the effect on the primordial gravitational wave spectrum. Primordial...

Dr
eduardo peinado
(Instituto de Fisica, Universidad Nacional Autonoma de Mexico)

9/9/19, 3:00 PM

Neutrinos

Oral presentation in parallel session

Neutrino masses and Dark matter both inarguably point
to presence of new physics beyond SM and are topics of
active theoretical and experimental research. In this talk we aim to discuss
a framework based on anomaly free U(1)B-L symmetry to obtain stable dark matter along with naturally small Dirac neutrino masses generated at the loop level.

Ms
Happy Borgohain
(Tezpur University)

9/9/19, 3:20 PM

Neutrinos

Oral presentation in parallel session

We consider the possibility of texture zeros in lepton mass matrices of minimal left-right symmetric model (LRSM) where light neutrino mass arises from a combination of type I and type II seesaw mechanisms. Based on the allowed texture zeros in light neutrino mass matrix from neutrino and cosmology data, we make a list of all possible allowed and disallowed texture zeros in Dirac and heavy...