Newton Nath

INFN - Istituto Nazionale di Fisica Nucleare Bari Italy · Theoretical physics

A bstract Solar nuclear reactions can occasionally produce sub-MeV elusive beyond the Standard Model particles that escape the solar interior without further interactions. This study focuses on massive spin-one particles. We construct the general theoretical framework and identify two crucial mixing sources involving the photon, which facilitate co...

We consider a $$U(1)_{B-L}$$ U ( 1 ) B - L model with a $$Z^\prime $$ Z ′ portal Dirac fermion dark matter (DM) $$\chi $$ χ of low mass which couples very weakly to the $$B - L$$ B - L gauge boson $$Z^\prime $$ Z ′ . An arbitrary $$B-L$$ B - L charge $$Q\ne \pm 1, \pm 3$$ Q ≠ ± 1 , ± 3 of the DM $$\chi $$ χ ensures its stability. Motivated by the s...

Whether the neutrino mass ordering is normal or inverted remains an experimentally open issue in neutrino physics. The knowledge of neutrino mass ordering has great importance for neutrinoless double-beta ( $$ 0\nu \beta \beta $$ 0 ν β β ) decay experiments, which can establish the nature of massive neutrinos, i.e., whether they are Dirac or Majora...

Whether the neutrino mass ordering is normal or inverted remains an experimentally open issue. The ultimate answer is of great importance for neutrinoless double-beta ($ 0\nu\beta\beta$) decay experiments, whose discovery potential significantly relies on the neutrino mass ordering. Recently, the KamLAND-Zen 800 measurement has reached for the firs...

We explore the neutrinoless double beta (0 νββ ) decay induced by an ultralight dark matter field coupled to neutrinos. The effect on 0 νββ decay is significant if the coupling violates the lepton number, for which the ΔL = 2 transition is directly driven by the dark matter field without further suppression of small neutrino masses. As the ultralig...

We examine the potential to probe generalized neutrino interactions (GNIs), exotic effective couplings due to new physics interactions beyond the Standard Model, in the coherent-elastic neutrino-nucleus scattering experiments in light of the latest COHERENT-CsI and -LAr data. Our analysis focuses on scalar-, vector-, and tensor-flavored GNI paramet...

We consider a $U(1)_{B-L}$ model with a $Z^\prime$ portal Dirac fermion dark matter (DM) $\chi$ of low mass which couples very weakly to the $B - L$ gauge boson $Z^\prime$. An arbitrary $B-L$ charge $Q\neq \pm1, \pm 3$ of the DM $\chi$ ensures its stability. Motivated by the sensitivity reach of forthcoming "Lifetime Frontier" experiments, we focus...

We examine the potential to probe generalized neutrino interactions (GNI), exotic effective couplings due to new physics interactions beyond the Standard Model, in the coherent-elastic neutrino-nucleus scattering experiments in light of the latest COHERENT-CsI, and -LAr data. Our analysis focuses on scalar, vector and tensor flavored-GNI parameters...

We explore the neutrinoless double beta ($0\nu \beta\beta$) decay induced by an ultralight dark matter field coupled to neutrinos. The effect on $0\nu\beta\beta$ decay is significant if the coupling violates the lepton number, for which the $\Delta L=2$ transition is directly driven by the dark matter field without further suppression of small neut...

A bstract Extensions of the Standard Model with charged Higgs, having a non-negligible coupling with neutrinos, can have interesting implications vis-à-vis neutrino experiments. Such models can leave their footprints not only in the ultra-high energy neutrino detectors like IceCube but can also give rise to the neutrino non-standard interactions (N...

A bstract We explore the possibility of having a fermionic dark matter candidate within U(1)′ models for CE ν NS experiments in light of the latest COHERENT data and the current and future dark matter direct detection experiments. A vector-like fermionic dark matter has been introduced which is charged under U(1)′ symmetry, naturally stable after s...

We explore the possibility of having a fermionic dark matter candidate within $U(1)'$ models for CE$\nu$NS experiments in light of the latest COHERENT data and the current and future dark matter direct detection experiments. A vector-like fermionic dark matter has been introduced which is charged under $U(1)'$ symmetry, naturally stable after spont...

We propose UV-completions of Froggatt–Nielsen–Peccei–Quinn models of fermion masses and mixings with flavored axions, by incorporating heavy fields. Here, the U (1) Froggatt–Nielsen symmetry is identified with the Peccei–Quinn symmetry to solve the strong CP problem along with the mass hierarchies of the Standard Model fermions. We take into accoun...

In the traditional neutrinophilicDey, Ujjal two Higgs doublet model (ν2HDM),Nath, Newton there is no non-standard neutrino interaction (NSI), due to the tiny mixing of the two scalar doublets.Sadhukhan, Soumya Here, we generate significant NSI along with tiny Dirac neutrino mass, modifying ν2HDM with a negative charge to eR under a global U(1) symm...

In this work, we study the consequencesDeepthi, K. N. of the ‘partial μ–τ’ reflection symmetry and the testability of the correspondingChakraborty, Kaustav symmetry predictions at the upcoming experiments: Deep Underground Neutrino Experiment (DUNE) and Hyper-Kamiokande (HK) experiment.Chakraborty, Srubabati Each prediction |Uμi|=|Uτi|(i=1,2,3) whe...

We propose UV-completions of Froggatt-Nielsen-Peccei-Quinn models of fermion masses and mixings with flavored axions, by incorporating heavy fields. Here, the $U(1)$ Froggatt-Nielsen symmetry is identified with the Peccei-Quinn symmetry to solve the strong CP problem along with the mass hierarchies of the Standard Model fermions. We take into accou...

Extensions of the Standard Model with charged Higgs, having a non-negligible coupling with neutrinos, can have interesting implications vis-\`{a}-vis neutrino experiments. Such models can leave their footprints in the ultra-high energy neutrino detectors like IceCube in the form of neutrino non-standard interactions (NSIs) which can also be probed...

The T2K collaboration has recently reported their results, which gives the best-fit values of the atmospheric mixing angle sin2θ23=0.53 and the Dirac CP-violating phase δ=-1.89 for normal neutrino mass ordering. We give a possible theoretical origin of such values based on the μ-τ reflection symmetry. It has been found that the breaking of such sym...

We present a minimal left-right symmetric flavor model and analyze the predictions for the neutrino sector. In this scenario, the Yukawa sector is shaped by the dihedral D4 symmetry which leads to correlations for the neutrino mixing parameters. We end up with the four possible solutions within this model. We further analyzed the impact of the upco...

We examine the implications of a recently proposed theory of fermion masses and mixings in which an A4 family symmetry emerges from orbifold compactification. We analyze two variant schemes concerning their predictions for neutrino oscillations, neutrinoless double-beta decay, and the golden quark-lepton unification mass relation. We find that upco...

We explore the potential to prove light extra gauge Z′ boson inducing nonstandard neutrino interactions (NSIs) in the coherent-elastic neutrino-nucleus scattering (CEνNS) experiments. We intend to examine how the latest COHERENT-CsI and CENNS-10 data can constrain this model. A detailed investigation for the upcoming Ge, LAr-1t, and NaI detectors o...

We aim to explain the nature of neutrinos using Peccei-Quinn symmetry. We discuss two simple scenarios, one based on a type-II Dirac seesaw and the other in a one-loop neutrino mass generation, which solve the strong CP problem and naturally lead to Dirac neutrinos. In the first setup latest neutrino mass limit gives rise to axion which is in the r...

Nonstandard interactions (NSIs), possible subleading effects originating from new physics beyond the Standard Model, may affect the propagation of neutrinos and eventually contribute to measurements of neutrino oscillations. Besides this, μ−τ reflection symmetry, naturally predicted by non-Abelian discrete flavor symmetries, has been very successfu...

The T2K collaboration has recently reported their results, which gives the best-fit values of the atmospheric mixing angle $\sin^2 \theta_{23} = 0.53$ and the Dirac CP-violating phase $\delta = -1.89$ for normal neutrino mass ordering. We give a possible theoretical origin of such values based on the $\mu$-$\tau$ reflection symmetry. It has been fo...

We examine the implications of a recently proposed theory of fermion masses and mixings in which an $A_4$ family symmetry emerges from orbifold compactification. We analyse two variant schemes concerning their predictions for neutrino oscillations, neutrinoless double-beta decay and the golden quark-lepton unification mass relation. We find that up...

We make an attempt to study the present status of the tetra-maximal neutrino mixing (TMM) pattern. It predicts all the three leptonic mixing angles θ13≈8.4∘,θ12≈30.4∘, and θ23=45∘ together with the three CP-violating phases −δ=ρ=σ=90∘. However, the latest global analysis of neutrino oscillation data prefer relatively higher best-fit value of θ12 as...

We present a minimal left-right symmetric flavor model and analyze the predictions for the neutrino sector. In this scenario, the Yukawa sector is shaped by the dihedral $D_4$ symmetry which leads to correlations for the neutrino mixing parameters. We end up with four possible solutions within this model. We further analyzed the impact of the upcom...

We explore the potential to prove light extra gauge $Z^\prime$ boson inducing non-standard neutrino interactions (NSIs) in the coherent-elastic neutrino-nucleus scattering (CE$ \nu $NS) experiments. We intend to examine how the latest COHERENT-CsI data can constrain this model. A detailed investigation for the upcoming Ge, LAr, and NaI detectors of...

We aim to explain the nature of neutrinos using Peccei-Quinn symmetry. We discuss two simple scenarios, one based on a type-II Dirac seesaw and the other in a one-loop neutrino mass generation, which solve the strong CP problem and naturally lead to Dirac neutrinos. In the first setup latest neutrino mass limit gives rise to axion which is in the r...

We make an attempt to study the present status of the tetra-maximal neutrino mixing (TMM) pattern. It predicts all the three leptonic mixing angles $\theta_{13} \approx 8.4^\circ, \theta_{12} \approx 30.4^\circ, $ and $\theta_{23} = 45^\circ $ together with the three CP-violating phases $ - \delta = \rho = \sigma = 90^\circ $. However, the latest g...

Non-standard interactions (NSI), possible sub-leading effects originating from new physics beyond the Standard Model, may affect the propagation of neutrinos and eventually contributes to measurements of neutrino oscillations. Beside this, $ \mu-\tau $ reflection symmetry, naturally predicted by non-Abelian discrete flavour symmetries, has been ver...

The minimal seesaw framework, embroiling the Dirac neutrino mass matrix [Formula: see text] and the Majorana neutrino mass matrix [Formula: see text], is quite successful to explain the current global-fit results of neutrino oscillation data. In this context, we consider the most predictive forms of [Formula: see text] and [Formula: see text] with...

Bi-large patterns for the leptonic mixing matrix are confronted with current neutrino oscillation data. We analyse the status of these patterns and determine, through realistic simulations, the potential of the upcoming long-baseline experiment DUNE in testing bi-large ansatze and discriminating amongst them.

Determination of leptonic CP violation is one of the open and most challenging problems in particle physics. Observation of neutrino oscillation, in particular, a non-zero value of the third neutrino mixing angle, has facilitated the possibility of determination of the parameter characterizing CP violation. In this paper we introduce CP violation a...

Bi-large patterns for the leptonic mixing matrix are confronted with current neutrino oscillation data. We analyse the status of these patterns and determine, through realistic simulations, the potential of upcoming long-baseline experiment DUNE in testing bi-large \emph{ansatze} and discriminating amongst them.

We examine the capabilities of the DUNE experiment in probing leptonic CP violation within the framework of theories with generalized CP symmetries characterized by the texture zeros of the corresponding CP transformation matrices. We investigate DUNE’s potential to probe the two least known oscillation parameters, the atmospheric mixing angle θ23...

We make an attempt to study the impact of renormalization-group-equation-(RGE-) induced μ−τ reflection symmetry breaking on the effective Majorana neutrino mass |⟨m⟩ee| in neutrinoless double beta (0νββ) decay. At present, the 0νββ decay serves as a unique process to address the Majorana nature of massive neutrinos. The rate of such a decay process...

We examine the capabilities of the DUNE experiment in probing leptonic CP violation within the framework of theories with generalized CP symmetries characterized by the texture zeros of the corresponding CP transformation matrices. We investigate DUNE's potential to probe the two least known oscillation parameters, the atmospheric mixing angle $\th...

The axion-like particles (ALPs) are very good candidates of the cosmological dark matter, which can exist in many extensions of the standard model (SM). The mass of the ALPs can be as small as \({\mathcal {O}}(10^{-22})~\mathrm{eV}\). On the other hand, the neutrinos are found to be massive and the SM must be extended to explain the sub-eV neutrino...

We study the origin, consequences, and testability of a hypothesis of “partial μ−τ” reflection symmetry. This symmetry predicts |Uμi|=|Uτi|(i=1,2,3) for a single column of the leptonic mixing matrix U. Depending on whether this symmetry holds for the first or second column of U, different correlations between θ23 and δCP can be obtained. This symme...

We make an attempt to study the impact of renormalization-group equations (RGE) induced $\mu-\tau$ reflection symmetry breaking on the effective Majorana neutrino mass $ |\langle m\rangle_{ee} | $ in neutrinoless double beta ($ 0\nu\beta \beta $) decay. At present, the $ 0\nu\beta \beta $ decay serves as a unique process to address the Majorana nat...

We consider minimal type–I seesaw framework to realize μ−τ reflection symmetry in the low-energy neutrino mass matrix, Mν. Considering DUNE experiment, we scrutinize its potential to measure the precision of 2-3 mixing angle, θ23 and the Dirac CP-phase, δ for the given symmetry. Later, we examine the precision of these two parameters considering Nu...

In the traditional neutrinophilic two-Higgs doublet model (ν2HDM), there is no nonstandard neutrino interaction (NSI) as the interactions between the Standard Model fermions with neutrinos are negligibly small due to the tiny mixing of the two scalar doublets. In this work, we propose that if ν2HDM is modified by considering the right-handed electr...

The axion-like particles (ALPs) are very good candidates of the cosmological dark matter, which can exist in many extensions of the standard model (SM). The mass range of the ALPs as the dark matter can extend from a sub-eV scale to almost $10^{-22}~{\rm eV}$. On the other hand, the neutrinos are found to be massive and the SM must be extended to e...

The minimal seesaw framework, embroiling the Dirac neutrino mass matrix $ M_D $ and the Majorana neutrino mass matrix $ M_R $, is quite successful to explain the current global-fit results of neutrino oscillation data. In this context, we consider most predictive forms of $ M_D $ and $ M_R $ with two simple parameters. Considering these matrices, w...

We consider minimal type - I seesaw framework to realize $ \mu-\tau $ reflection symmetry in the low energy neutrino mass matrix, $ M_{\nu} $. Considering DUNE experiment, we scrutinize its potential to measure the precision of 2-3 mixing angle, $ \theta_{23} $ and the Dirac CP-phase, $ \delta $ for the given symmetry. Later, we examine the precisi...

We discuss a comprehensive way to study the parameter degeneracies in the form of a generalized degeneracy in the neutrino oscillation experiments. First we describe the various degeneracies by considering only neutrino run of the long baseline experiment (LBL), NOA. Then we discuss the role of antineutrinos. Later, we present the combined role of...

In the traditional neutrinophilic two-Higgs doublet model ($\nu$2HDM), there is no non-standard neutrino interaction (NSI) as the interactions between the Standard Model fermions with neutrinos are negligibly small due to the tiny mixing of the two scalar doublets. In this work, we propose that if $\nu$2HDM is modified by considering the right-hand...

We study origin, consequences and testability of a hypothesis of `partial $\mu$-$\tau$' reflection symmetry. This symmetry predicts $ |U_{\mu i}|=|U_{\tau i}|~(i=1,2,3) $ for a single column of the leptonic mixing matrix $U$. Depending on whether this symmetry holds for the first or second column of $U$ different correlations between $\theta_{23}$...

We embed $\mu-\tau$ reflection symmetry into the minimal seesaw formalism, where two right-handed neutrinos are added to the Standard Model of particle physics. Assuming that both the left- and right-handed neutrino fields transform under $\mu-\tau$ reflection symmetry, we obtain the required forms of the neutrino Dirac mass matrix and the Majorana...

We embed $\mu-\tau$ reflection symmetry into the minimal seesaw formalism, where two right-handed neutrinos are added to the Standard Model of particle physics. Assuming that both the left- and right-handed neutrino fields transform under $\mu-\tau$ reflection symmetry, we obtain the required forms of the neutrino Dirac mass matrix and the Majorana...

One of the primary objectives of Deep Underground Neutrino Experiment (DUNE) is to discover the leptonic CP violation and to identify it's source. In this context, we study the impact of non-standard neutrino interactions (NSIs) on observing the CP violation signal at DUNE. We explore the impact of various parameter degeneracies introduced by non-z...

One of the primary objectives of Deep Underground Neutrino Experiment (DUNE) is to discover the leptonic CP violation and to identify it's source. In this context, we study the impact of non-standard neutrino interactions (NSIs) on observing the CP violation signal at DUNE. We explore the impact of various parameter degeneracies introduced by non-z...

We discuss the implications of the latest NO$ \nu $A results on the measurement of $\nu_\mu - \nu_e$ conversions. From a combined analysis of the disappearance and appearance data, the preferred solutions reported by NO$ \nu $A are normal hierarchy (NH) with two degenerate best-fit points one in the lower octant (LO) and $ \delta_{CP} = 1.48\pi$ wh...

We discuss the implications of the latest NOνA results on the measurement of νµ − νe conversions. From a combined analysis of the disappearance and appearance data, the preferred solutions reported by NOνA are normal hierarchy (NH) with two degenerate best-fit points one in the lower octant (LO) and δCP = 1.48π whereas the other in the higher octan...

We discuss a comprehensive way to study the parameter degeneracies in the form of a generalized degeneracy in the neutrino oscillation experiments. First we describe the various degeneracies by considering only neutrino run of the long baseline experiment (LBL), NO$ \nu $A. Then we discuss the role of antineutrinos. Later, we present the combined r...

In this work we consider the effect of non-standard interactions (NSI) on the propagation of neutrinos through matter and how it affects the hierarchy sensitivity of the DUNE experiment. We emphasize on the special case when the diagonal NSI parameter $\epsilon_{ee} = -1$ and nullifies the standard matter effect. We show that, if in addition, there...

We study the effect of non-standard interactions (NSIs) on the propagation of neutrinos through the Earth matter and how it affects the hierarchy sensitivity of the DUNE experiment. We emphasize on the special case when the diagonal NSI parameter $\epsilon_{ee} = -1$, nullifying the standard matter effect. We show that, if in addition, CP violation...

We study the efficiency of DUNE, a next generation long baseline oscillation experiment to resolve two major unknowns in neutrino oscillation physics. These are, octant of $\theta_{23}$ (i.e. if $\theta_{23}$ is $< 45^\circ$ or $>45^\circ$) and Dirac CP phase $\delta_{CP}$. We mainly focus on the role of antineutrinos when they travel 1300 km basel...

We study the zero textures of the Yukawa matrices in the minimal extended type-I seesaw (MES) model which can give rise to $\sim$ eV scale sterile neutrinos. In this model, three right handed neutrinos and one extra singlet $S$ are added to generate a light sterile neutrino. The light neutrino mass matrix for the active neutrinos, $ m_{\nu}$, depen...

We study the zero textures of the Yukawa matrices in the minimal extended type-I seesaw (MES) model which can give rise to $\sim$ eV scale sterile neutrinos. In this model, three right handed neutrinos and one extra singlet $S$ are added to generate a light sterile neutrino. The light neutrino mass matrix for the active neutrinos, $ m_{\nu}$, depen...

We study the capability of the DUNE experiment, which will be the first beam based experiment with a wide band flux profile, to uncover the octant of the leptonic mixing angle $\theta_{23}$ (i.e., $\theta_{23}$ is $< 45^\circ$ or $>45^\circ$). In this work, we find that for the DUNE baseline of 1300 km, due to enhanced matter effect, the neutrino a...

The octant of the leptonic mixing angle and the CP phase are the two major unknowns (apart from neutrino mass hierarchy) in neutrino oscillation physics. It is well known that the precise determination of octant and is interlinked through the octant- degeneracy. In this paper we study the proficiency of the DUNE experiment to determine these parame...

We present a detailed analysis and phenomenological consequences of neutrino mass matrix, Mν, with one-zero texture in the flavor basis where the active neutrino sector is extended by one sterile neutrino (3+1 case). In particular, our aim is to explore behavior of the sterile mixing parameters in detail when one of the elements of the neutrino mas...

We discuss consequences of assuming that the (Majorana) neutrino mass matrix $M_\nu$ and the charged lepton mass matrix $M_l$ satisfy, $S_\nu^T M_\nu S_\nu=-M_\nu~,T_l^\dagger M_lM_l^\dagger T_l=M_lM_l^\dagger$ with respect to some discrete groups $S_\nu,T_l$ contained in $A_5$. These assumptions lead to a neutrino mass spectrum with two degenerate...

The three major unknown neutrino oscillation parameters at the present juncture are the mass hierarchy, the octant of the mixing angle θ23 and the CP phase δCP. It is well known that the presence of hierarchy-δCP and octant degeneracies affects the unambiguous determination of these parameters. In this paper, we show that a comprehensive way to stu...

We present a detailed analysis and phenomenological implications of a singular neutrino mass matrix $M_{\nu}$ with one-zero texture in the flavor basis where the active neutrino sector is extended by one sterile neutrino. Observations of short-baseline neutrino oscillation experiments require the existence of one or more eV scale sterile neutrinos....

We study the proficiency of the DUNE experiment, which will be the first beam based experiment to use a baseline longer than 1000 km and a wide band flux profile, to unmask the octant of the leptonic mixing angle $\theta_{23}$. It has been realized, in the context of the off-axis experiments T2K and NO$\nu$A with baselines $< 1000$ km, that combina...

The three major unknown neutrino oscillation parameters at the present juncture are the mass hierarchy, the octant of the mixing angle $\theta_{23}$ and the CP phase $\delta_{CP}$. It is well known that the presence of hierarchy$-\delta_{CP}$ and octant degeneracies affects the unambiguous determination of these parameters. In this paper we show a...