Conveners
Neutrino II
- Kevin Kelly (Fermilab)
We explore the theoretical constraints on the observable parameters of neutrino mixing on predictions for the leptonic Dirac CP-violating phase within a class of theoretical models that include a single source of CP violation due to charged lepton corrections, with additional assumptions made regarding specific ansatzes for the probability distributions of the continuous input parameters. We...
I will discuss our recent work on a simple scoto-seesaw model that accounts for dark matter and neutrino masses with spontaneous CP violation. This is achieved with a single horizontal $\mathcal{Z}_8$ discrete symmetry, broken to a residual $\mathcal{Z}_2$ subgroup responsible for stabilizing dark matter. CP is broken spontaneously via the complex vacuum expectation value of a scalar singlet,...
We investigate both resonant and non-resonant thermal leptogenesis in the context of the recently proposed ``asymmetric texture'' from $SU(5)$ GUT with $\mathcal{T}_{13}$ family symmetry. A single source of $CP$ violation, originating from the vacuum alignment of the seesaw familons resulting in a complex tribimaximal mixing, is shown to yield Dirac $CP$ violation in agreement with global...
[This is based on Phys.Rev. D100 (2019) no.3, 035009 by Soumita Pramanick]
In this model, realistic neutrino mixing is obtained radiatively using $S_3 \times Z_2$
symmetry at one-loop level. The two right-handed neutrinos present in the model when maximally mixed
can yield the structure of the left-handed Majorana neutrino mass matrix corresponding to
$\theta_{13}=0$, $\theta_{23}=\pi/4$...
The data on tau neutrino is very scarce, only a few experiments have detected its interactions. At FNAL beam dump experiment DONUT, tau neutrino interaction cross-section was directly measured with a large systematical (~50%) and statistical (~30%) errors. The main source of systematical error is due to a poor knowledge of the tau neutrino flux. The effective way for tau neutrino production is...
Though two of the biggest puzzles in fundamental physics--the cosmic baryon asymmetry and tiny neutrino masses--can be elegantly accommodated in leptogenesis models, usually, these models cannot be subject to direct tests due to additional high energy parameters which are decoupled from low energy phenomena. In our novel scenario, the light neutrino masses are obtained through a quasi-Dirac...
Cosmology is well suited to study the effects of long range interactions due to the large densities in the early Universe. In this talk, I will explore how the energy density and equation of state of cosmological neutrinos diverge from the commonly assumed ideal gas form under the presence of scalar long range interactions with a range much smaller than cosmological scales. In this scenario,...
High-energy cosmic neutrinos present a unique opportunity to search for physics beyond Standard Model thanks to their reach to the highest energies and longest baseline. Beyond Standard Model induced interactions of high-energy neutrinos during their propagation yield distinct signatures in their observables in neutrino telescopes. Energy, flavor, arrival direction, and the arrival time of...
