39 research outputs found
Octant Degeneracy, Quadrant of leptonic CPV phase at Long Baseline Neutrino Experiments and Baryogenesis
In a recent work by us, we have studied, how CP violation discovery potential
can be improved at long baseline neutrino experiments (LBNE/DUNE), by combining
with its ND (near detector) and reactor experiments. In this work, we discuss
how this study can be further analysed to resolve entanglement of the quadrant
of leptonic CPV phase and Octant of atmospheric mixing angle ,
at LBNEs. The study is done for both NH (Normal hierarchy) and IH (Inverted
hierarchy), HO (Higher Octant) and LO (Lower Octant). We show how baryogenesis
can enhance the effect of resolving this entanglement, and how possible values
of the leptonic CP-violating phase can be predicted in this
context. With respect to the latest global fit data of neutrino mixing angles,
we predict the values of for different cases. In this context
we present favoured values of ( range at 2 ) constrained by the latest updated BAU range and also confront
our predictions of with an up-to-date global analysis of
neutrino oscillation data. We find that some region of the favoured parameter space lies within the best fit values around . A detailed analytic and numerical study of
baryogenesis through leptogenesis is performed in this framework in a model
independent way.Comment: 14 pages, 5 figures, 2 Tables, New Analysi
Compatibility of Flavour Symmetric Minimal Extended Seesaw with Neutrino Data
Motivated by the recent resurrection of the evidence for an eV scale sterile
neutrino from the MiniBooNE experiment, we revisit one of the most minimal
seesaw model known as the minimal extended seesaw that gives rise to a
light neutrino mass matrix. We consider the presence of flavour symmetry
which plays a non-trivial role in generating the structure of the neutrino mass
matrix. Considering a diagonal charged lepton mass matrix and generic vacuum
alignments of triplet flavons, we classify the resulting mass matrices
based on their textures. Keeping aside the disallowed texture zeros based on
earlier studies of neutrino textures, we categorise the remaining ones
based on texture zeros, symmetry in the block and hybrid
textures. After pointing out the origin of such neutrino textures to
vacuum alignments, we use the latest neutrino oscillation data and
numerically analyse the texture zeros and symmetric cases. We find
that a few of them are allowed from each category predicting interesting
correlations between neutrino parameters. We also find that all of these
allowed cases prefer normal hierarchical pattern of light neutrino masses over
inverted hierarchy.Comment: 46 pages, 8 figures, 21 table
Charged Lepton Flavor Violation in Symmetric SUSY SO(10) mSUGRA, NUHM, NUGM, and NUSM theories and LHC
Charged Lepton Flavor Violation (cLFV) processes like are rare decay processes, that are another signature of physics beyond
Standard Model (BSM). These processes have been studied in various models, that
could explain neutrino oscillations and mixings. In this work, we present
bounds on cLFV decay in a -
symmetric SUSY SO(10) theory, using type I seesaw mechanism. The updated
constraints on BR() from MEG experiment, recently
measured value of Higgs mass at LHC and value of from reactor
data have been used. We present our results in mSUGRA, NUHM, NUGM and NUSM
models, and sensitivity to test these theories at next run of LHC is also
discussed.Comment: 22 pages, 6 figures, 6 Table
A new viable mass region of Dark matter and Dirac neutrino mass generation in a scotogenic extension of SM
We propose a scotogenic extension of the Standard Model which can provide a
scalar Dark Matter candidate in the new, theoretically previously unaddressed,
intermediate region ( GeV) and also generate light
Dirac neutrino masses. In this framework, the standard model is extended by
three gauge singlet fermions, two singlet scalar fields, and one additional
scalar doublet, all of which are odd under discrete
symmetry. These additional symmetries prevent the singlet fermions from
obtaining Majorana mass terms along with providing the stability to the dark
matter candidate. It is known that in the case of the scalar singlet DM model,
the only region which is not yet excluded is a narrow region close to the Higgs
resonance - others ruled out from different
experimental and theoretical bounds. In the case of the Inert doublet model,
the mass region (- GeV) and the high mass region (heavier than GeV) are allowed. This motivates us to explore a parameter range in the
intermediate-mass region GeV, which we do in a
scotogenic extension of SM with a scalar doublet and scalar singlets. The dark
matter in our model is a mixture of singlet and doublet scalars. We constrain
the allowed parameter space of the model using Planck bound on present dark
matter relic abundance, neutrino mass, and the latest bound on spin-independent
DM-nucleon scattering cross-section from XENON1T experiment. Our model may
provide a viable DM candidate in the new, previously unexplored mass range
( GeV), if this new window for the DM candidate mass is
detected in future experiments, along with explanation of Dirac mass of
neutrinos, since so far there is no strong evidence in support of Majorana
nature of neutrino mass.Comment: 16 pages, 7 figures, 1 tabl