We propose a new realization of light Dirac neutrino mass and dark matter (DM) within the framework non-Abelian discrete flavor symmetry based on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>A</a:mi><a:mn>4</a:mn></a:msub></a:math> group. In addition to <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msub><c:mi>A</c:mi><c:mn>4</c:mn></c:msub></c:math>, we also consider <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"...

We propose two different seesaw models namely, type I and inverse to realise light Dirac neutrinos within the framework of $A_4$ discrete flavour symmetry. The additional fields their transformations under symmetries are chosen in such a way that naturally predicts hierarchies elements mass matrices these types mechanisms. For generic choices flavon alignments, both predict normal hierarchical neutrino masses with atmospheric mixing angle lower octant. Apart from predicting interesting...

In light of the recent discovery nonzero ${\ensuremath{\theta}}_{13}$, we have analyzed Altarelli-Feruglio ${A}_{4}$ flavor symmetry model extended with additional flavon. The inclusion new field leads to deviation from exact tri-bimaximal neutrino mixing pattern in context a type-I seesaw by producing ${\ensuremath{\theta}}_{13}$ consistent experimental results at leading order. A sum rule for masses is also obtained this context. setup constrains two Majorana phases involved lepton matrix...

We propose a linear seesaw model to realise light Dirac neutrinos within the framework of $A_4$ discrete flavour symmetry. The additional fields and their transformations under symmetries are chosen in such way that naturally predicts hierarchies different elements mass matrix also keeps unwanted terms away. For generic choices flavon alignments, normal hierarchical neutrino masses with atmospheric mixing angle lower octant. Apart from predicting interesting correlations between parameters...

Motivated by the fact that origin of tiny Dirac neutrino masses via standard model Higgs field and non-thermal dark matter populating Universe freeze-in mechanism require dimensionless couplings similar order magnitudes $(\sim 10^{-12})$, we propose a framework can dynamically generate such in unified manner. Adopting flavour symmetric approach based on $A_4$ group, construct where coupling to its mother particle occur at dimension six level involving same flavon fields, thereby generating...

We propose a hybrid scoto-seesaw model based on the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>A</a:mi><a:mn>4</a:mn></a:msub><a:mo>×</a:mo><a:msub><a:mi>Z</a:mi><a:mn>4</a:mn></a:msub><a:mo>×</a:mo><a:msub><a:mi>Z</a:mi><a:mn>3</a:mn></a:msub><a:mo>×</a:mo><a:msub><a:mi>Z</a:mi><a:mn>2</a:mn></a:msub></a:math> non-Abelian discrete flavor symmetry. Light neutrino masses come from tree-level type-I seesaw mechanism, and one-loop scotogenic contribution...

We provide an ${A}_{4}$-based flavor symmetric scenario to accommodate the inverse seesaw mechanism for explaining light neutrino masses and mixing. find that lepton mixing, in particular, tribimaximal mixing pattern its deviation through nonzero ${\ensuremath{\theta}}_{13}$, is originated solely from structure of number violating contribution neutral mass matrix. Here we discuss detail how a value ${\ensuremath{\theta}}_{13}$ correlated with other parameters framework impact on Dirac $CP$...

A possible interplay between the two terms of general type-II seesaw formula is exercised which leads to generation nonzero $\theta_{13}$. The specific flavor structure model, guided by $A_4 \times Z_4 Z_3$ symmetry and accompanied with Standard Model singlet flavons, yields conventional contribution produce tribimaximal lepton mixing further corrected presence $SU(2)_L$ triplet accommodate We consider CP be spontaneously broken complex vacuum expectation value (vev) a field $S$. While...

A bstract To understand the observed pattern of neutrino masses and mixing as well to account for dark matter we propose a hybrid scoto-seesaw model based on 4 discrete flavor symmetry. In this setup, including at least two heavy right-handed neutrinos is essential employ symmetry that mimics once popular tribimaximal leading order via type-I seesaw. The scotogenic contribution then acts critical deviation reproduce value reactor angle θ 13 (within trimaximal scheme) accommodate potential...

We propose a minimal extension of the standard model by including $U(1)$ flavor symmetry to establish correlation between relic abundance dark matter, measured WMAP and PLANCK satellite experiments non-zero value $\sin \theta_{13}$ observed at DOUBLE CHOOZ, Daya Bay, RENO T2K. The flavour is allowed be broken high scale remnant $\mathcal{Z}_2$ symmetry, which not only ensures stability but also gives rise modification existing $A_4$-based tri-bimaximal neutrino mixing. This deviation in turn...

We propose a flavor symmetric approach to unify the origin of dark matter (DM) with non-zero $\theta_{13}$ in lepton sector. In this framework, breaking $U(1)$ symmetry remnant $Z_2$ ensures stability DM and gives rise modification existing $A_4$-based tri-bimaximal neutrino mixing attain required $\sin \theta_{13}$. This results range Higgs portal coupling which can be potentially accessible at various ongoing future direct collider search experiments.

We discuss neutrino mass and mixing models based on discrete flavor symmetries. These can include a variety of new interactions non-standard particles such as sterile neutrinos, scalar Higgs singlets multiplets. point at connections the with leptogenesis dark matter ways to detect corresponding intensity energy frontier experiments.

In an attempt to unfold (if any) a possible connection between two apparently uncorrelated sectors, namely neutrino and dark matter, we consider the type-I seesaw fermion singlet matter start with. Our construction suggests that there exists scalar field mediator these sectors whose vacuum expectation value not only generates mass of but also takes part in generation. While choice $Z_4$ symmetry allows us establish framework, breaks remnant $Z_2$, is responsible keep stable. Therefore,...

We investigate the consequences of $\mu-\tau$ reflection symmetry in presence a light sterile neutrino for $3+1$ mixing scheme. discuss implications total as well partial symmetry. For we find values $\theta_{23}$ and $\delta$ remains confined near $\pi/4$ $\pm \pi/2$ respectively. The current allowed region case inverted hierarchy lies outside area preferred by However, interesting predictions on angles Dirac CP violating phases are obtained considering obtain predictive correlations...

We propose a minimal $A_4$ flavor symmetric model, assisted by $Z_2 \times Z_3$ symmetry, which can naturally takes care of the appropriate lepton mixing and neutrino masses via Type-I seesaw. It turns out that framework, originated due to specific structure, favors normal hierarchy light neutrinos simultaneously narrows down range Dirac CP violating phase. predicts an interesting correlation between atmospheric angle phase too. While structure indicates exact degeneracy right handed masses,...

We study a discrete flavor symmetric scenario for neutrino mass and dark matter under the circumstances where such global symmetries can be explicitly broken at Planck scale, possibly by gravitational effects. Such explicit breaking of mimic as suppressed operators in model, which have nontrivial consequences sectors. In particular, we model which, renormalizable level, gives rise to tri-bimaximal type mixing with vanishing reactor angle ${\ensuremath{\theta}}_{13}=0$, stable inert scalar...

Correlations obtained from neutrino oscillation data on mixing parameters may help to validate schemes. In this context, we explore how correlations of affect the $\rm{TM}_1$ and $\rm{TM}_2$ scenarios.

We propose a new mixing scheme for neutrinos which eventually can be linked to neutrino mass matrix texture bearing suitable correlation ($m_{22} + 2\,m_{13} = 0$) among its elements. The predicts three eigenvalues in the light of normal ordering, addition Majorana phases. is realized from $A_4 \times Z_{10} Z_2$ group framework general type-I+II seesaw mechanism.

We propose a new realisation of light Dirac neutrino mass and dark matter (DM) within the framework non-Abelian discrete flavour symmetry $A_4$. In addition to $A_4$, we also consider $Z_2$ an unbroken global lepton number $U(1)_L$ keep unwanted terms away while guaranteeing nature neutrinos. The field content, their transformations flavon vacuum alignments are chosen in such way that type-I seesaw generates only one other two masses arise from scotogenic contributions at one-loop. breaking...

We propose a hybrid scoto-seesaw model based on the $A_4$ non-Abelian discrete flavor symmetry. Light neutrino masses come from tree-level type-I seesaw mechanism and one-loop scotogenic contribution accommodating viable dark matter candidates responsible for observed relic abundance of (DM). Respectively, both these contributions restore atmospheric solar mass scales. With only one right-handed neutrino, features specific predictions with normal ordering light masses, lightest being...

We have analyzed a Type-I+II seesaw scenario to generate neutrino masses and mixing in A4 based flavor symmetric framework. The Standard Model (SM) particle content is extended by three singlet right handed neutrinos, an additional higgs triplet along with few SM flavon fields. In this set-up, the pure type-I contribution mass matrix exhibits tribimaximal (TBM) of lepton where generates θ13. Complex vev one provides unique source spontaneous CP violation. Here it turns out that common for...