Article
Physics, Particles & Fields
Bikash Thapa, Ng. K. Francis
Summary: The study introduces an S-4 flavor symmetric model within a minimal Seesaw framework, predicting the Normal Hierarchy for neutrino masses. It evaluates the effective Majorana neutrino mass and examines the possibility of explaining baryogenesis through resonant leptogenesis. The study also investigates non-zero, resonantly enhanced CP asymmetry generated from the decay of right-handed neutrinos at the TeV scale, considering flavor effects.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Zhen-hua Zhao, Xin-Yu Zhao, Hui-Chao Bao
Summary: In this paper, we investigate the simplified textures of M-D that can naturally yield the trimaximal neutrino mixings in the seesaw framework. We analyze the parameters of these textures and examine their consequences for the neutrino parameters and leptogenesis. Additionally, we propose a concrete flavor-symmetry model to realize one representation of these textures.
Article
Physics, Multidisciplinary
Nayana Gautam, R. Krishnan, Mrinal Kumar Das
Summary: In this study, we investigated the impact of sterile neutrinos on low-scale processes within the framework of the minimal extended seesaw (MES) model based on Delta(96) x C (2) x C (3) flavor symmetry. The model predicts the maximal value of the Dirac CP phase and normal ordering (NO) of neutrino masses. Our analysis suggests that a heavy sterile neutrino can contribute to charged lepton flavor violation (cLFV) processes that are detectable by current and upcoming experiments, while remaining consistent with the limits set by neutrinoless double beta decay (0 nu beta beta) experiments.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Particles & Fields
Zhen-hua Zhao
Summary: This paper investigates the possibility of resonant leptogenesis by embedding trimaximal mixing and mu-tau reflection symmetry in the minimal seesaw model. It is found that breaking the special forms of the neutrino mass matrix slightly can allow leptogenesis to proceed.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Zhen-hua Zhao
Summary: In this paper, the authors propose a novel possibility, called the AIT ansatz, that allows the neutrinoless double beta decay to be hidden, despite the Majorana nature of neutrinos. They study a split seesaw model with one lighter right-handed neutrino and two heavier right-handed neutrinos, which can accommodate both the AIT ansatz and successful leptogenesis. The implications of this model are discussed, including the conditions for realizing the AIT ansatz and its effects on the mixing of neutrinos.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
R. Krishnan
Summary: This article presents a neutrino model constructed using the flavour group S-4 x C-4 x C-3 x C-2 under the type 1 seesaw mechanism. The vacuum alignments of the flavons in the model lead to the TM1 mixing and the prediction of individual light neutrino masses. To achieve the desired alignments, the auxiliary group framework is employed.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Astronomy & Astrophysics
Juraj Klaric, Mikhail Shaposhnikov, Inar Timiryasov
Summary: Right-handed neutrinos provide an elegant and minimalistic solution to explaining the masses and oscillations of neutrinos, as well as the baryon asymmetry of the Universe, by adding singlet Majorana fermions to the Standard Model particle content. The mass scale of right-handed neutrinos can be very low and accessible by current and planned experiments, with two well-studied mechanisms of low-scale leptogenesis overlapping significantly. This unified perspective reveals the synergy between intensity and energy frontiers in the search for heavy Majorana neutrinos.
Article
Astronomy & Astrophysics
N. Chamoun, C. Hamzaoui, E. Lashin, S. Nasri, M. Toharia
Summary: Inspired by neutrino oscillations data, this study considers implementing exact mu-tau symmetry at the level of the neutrino mass matrix, and deviates from symmetry by adjusting phases to study and describe neutrino phenomenology. The breaking of phases leads to interesting lower bounds on the allowed mass of the lightest neutrino, depending on the ordering of neutrino masses and the CP violating phase. The parameter space for the effective Majorana neutrino mass is also shown to be nontrivially constrained.
Article
Astronomy & Astrophysics
K. Ezzat, M. Ashry, S. Khalil
Summary: The model is based on SU(3)C x SU(2)(L) x SU(2)(R)x U(1)(B-L) x Z(2) symmetry, with a simplified Higgs sector consisting of one bidoublet and one SU(2)(R) doublet. The tiny neutrino masses are generated through an inverse-seesaw mechanism, and the tree-level flavor changing neutral current is strongly suppressed. The lightest CP-even Higgs boson and the next lightest Higgs boson are found to be from the neutral components of the bidoublet, with the latter having a mass in the few hundred GeV range. Detection of the next lightest Higgs boson at the LHC is analyzed for different center-of-mass energies and integrated luminosities, showing promising signals in various decay channels.
Article
Astronomy & Astrophysics
C. Soumya
Summary: This paper investigates the capability of long-baseline experiments using neutrinos from the Japan Proton Accelerator Research Complex to establish the unitarity of active-neutrino mixing. It is found that T2HK can establish the unitarity of active neutrino mixing at above 2 sigma C.L. for a certain range of the nonunitary parameter alpha(21). The paper also discusses the limit on the nonunitary parameter in the 21 sector and the sensitivity limit of these experiments in determining the nonunitary parameter. The results show that the sensitivity limit of T2HK on the nonunitary parameter is better than that of both T2HKK and T2K.
Article
Astronomy & Astrophysics
Alessandro Di Marco, Amit Dutta Banik, Anish Ghoshal, Gianfranco Pradisi
Summary: We discuss the impact of a nonstandard multiple scalar field cosmology on the thermal history of the Universe and high-scale leptogenesis, focusing on a post-inflationary reheating phase. In particular, we explore models with scalar fields in a brane-inspired dynamical scenario that modify the Boltzmann equations for standard leptogenesis. The lepton asymmetry YL, generated by the decays of heavy Majorana right-handed neutrinos responsible for Standard Model neutrino masses, can be enhanced or reduced depending on the values of the new parameters and the number of additional scalar fields.
Article
Astronomy & Astrophysics
Mitesh Kumar Behera, Subhasmita Mishra, Shivaramakrishna Singirala, Rukmani Mohanta
Summary: The study discusses the application of A(4) modular symmetry in neutrino phenomenology, as well as the impact of CP asymmetry in heavy fermion superfield decay on the preferred phenomena of leptogenesis including flavor effects.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Astronomy & Astrophysics
T. M. Manosh, N. Shaji, Ramesh Babu Thayyullathil, Titus K. Mathew
Summary: Neutrinos can acquire both dynamic and geometric phases due to the nontrivial mixing between mass and flavor eigenstates. The general expressions for all plausible gauge invariant diagonal and off-diagonal geometric phases in the three-flavor neutrino model are derived using the kinematic approach in this paper. It is found that diagonal and higher-order off-diagonal geometric phases are sensitive to the mass ordering and the Dirac CP violating phase delta. The effects of matter background on geometric phases are also explored in a two-flavor neutrino model, where the diagonal geometric phase is either 0 or pi in the MSW resonance region and takes nontrivial values elsewhere.
MODERN PHYSICS LETTERS A
(2022)
Article
Physics, Particles & Fields
Zhi-zhong Xing
Summary: In the canonical seesaw framework, flavor mixing and CP violation in weak charged-current interactions of light and heavy Majorana neutrinos are correlated. This correlation can be described by equations and leads to a prediction. The study also reveals a minimal flavor symmetry that can constrain the flavor textures of neutrinos to some extent.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Sin Kyu Kang
Summary: The investigation shows that low-energy electron-type CP violation can lead to the CP asymmetry necessary for leptogenesis in a minimal seesaw model with a one-zero texture. The study also demonstrates how the CP phases in the neutrino mixing matrix can be constrained, and predicts the effective neutrino mass contributing to the amplitude of neutrinoless double beta decay based on the constraints on neutrino parameters.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2021)
