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检索条件"丛书名=Springer Proceedings in Physics"

共 4830 条记录，以下是21-30 订阅

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Randomly Generated Majorana Neutrino Mass Matrix for CP-Conserving Case

Randomly Generated Majorana Neutrino Mass Matrix for CP-Cons...

引用

2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Singh, Y. Monitar Singh, Ngangkham Nimai Manipur Univ Dept Phys Imphal Manipur India Res Inst Sci & Technol RIST Imphal 795003 Manipur India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

The present work aims to discriminate among the theoretically predicted different forms of Majorana neutrino mass matrix including texture zeros. The neutrino oscillation parameters are numerically extracted by diagonalizing a general charge-parity (CP)-conserving Majorana neutrino mass matrix whose elements are randomly generated within a certain range of allowed values using adaptive Monte Carlo method. The latest neutrino oscillation experimental data within 3 sigma determines allowed values of the elements of the neutrino mass matrix. The latest Planck upper bound on the sum of three absolute masses Sigma |m(i) | < 0.12 eV is imposed in the numerical analysis. Both normal hierarchy (NH) and inverted hierarchy (IH) mass models are allowed, thus showing the possibility of both mass hierarchies within 3 sigma. Further, the detailed numerical analysis confirms that the normal hierarchical mass model is valid up to mass bound, Sigma |m(i) | = 0.06 eV while the inverted hierarchical mass model is valid up to mass bound Sigma |m(i) | >= 0.1eV. In both models, the value of theta(23) is allowed in both below and above 45 degrees. However, theta(23) > 45 degrees is found to be more favourable for NH whereas theta(23) < 45 degrees is more favourable for IH.

关键词： Adaptive Monte Carlo Method Majorana mass matrix Normal and Inverted hierarchical mass model

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The Possibility of Other Forces and Particles in Lepton Sector

The Possibility of Other Forces and Particles in Lepton Sect...

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Goswami, Sagar Tirtha Roy, Subhankar Gauhati Univ Dept Phys Gauhati India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

With the assumption that neutrinos are not Majorana fermions and the right-handed neutrinos do not exist, a novel model is presented where the second and third generations of leptons are treated as composites, while the first generation remains fundamental. These composite states are formed through the interaction of fundamental leptons with two new hidden scalar particles. Additionally, the proposed model introduces two hidden forces alongside the Standard Model interactions. We elucidate the origin of neutrino masses through the binding dynamics of a hidden force. The model offers a dynamical framework for explaining neutrino oscillation phenomena using these hidden forces. The basic framework of the standard model is preserved in this model.

关键词： Dirac neutrino Dynamic framework Generation Hidden forces Hidden scalars

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Effect of Texture Zeros in Modular Left-Right Symmetric Model (LRSM)

Effect of Texture Zeros in Modular Left-Right Symmetric Mode...

引用

2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Kakoti, Ankita Borgohain, Happy Das, Mrinal Kumar Tezpur Univ Dept Phys Tezpur Assam India Silapathar Coll Dept Phys Silapathar 787059 India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

In this work, Left-Right Symmetric Model (LRSM) has been realized with the modular group of level 3, that is,Gamma(3) and weight 2, which is isomorphic to non-abelian discrete symmetry group. A(4). Here, we take into consideration the possibilities of texture zeros in the mass matrices of the modular symmetric left-right model. As the type-I and type-II seesaw masses appear naturally in LRSM, the texture zero study has been carried out for both the Dirac and heavy right-handed Majorana mass matrices, respectively. The advantage of using modular symmetry is that we do not require the use of any extra particles (flavons) for obtaining the desired results within the realization of the model. As LRSM provides an environment for the study and analysis of beyond Standard Model phenomenology, in this work, we take into consideration the study of contributions of Neutrinoless Double Beta Decay within the framework of minimal LRSM with. A4 modular symmetry.

关键词： Left-Right Symmetric Model Modular symmetry Neutrinoless double beta decay Texture zeros

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Darko-Lepto-Genesis in Type-III Seesaw

Darko-Lepto-Genesis in Type-III Seesaw

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Paul, Partha Kumar Indian Inst Technol Hyderabad Dept Phys Hyderabad 502285 Telangana India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

In this study, we propose a concise model in the type-III seesaw framework to address neutrino mass, asymmetric dark matter (DM), and the baryon asymmetry of the Universe. The lepton asymmetry and relic density of DM are generated by the simultaneous CP-violating out-of-equilibrium decay of heavy triplet fermions to the visible sector and dark sector, respectively. Subsequently, the lepton asymmetry transforms into the required baryon asymmetry through electroweak sphalerons, while the asymmetry in the dark sector persists as the observed relic of dark matter. Soft breaking of a Z(2) symmetry, wherein DM is odd, results in an unstable asymmetric DM with a mass ranging from MeV to TeV.

关键词： Dark matter Leptogenesis Neutrino mass

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Exploring 3+1 Neutrino Models Under Modular S3 symmetry

Exploring 3+1 Neutrino Models Under Modular S3 symmetry

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Singh, Mayengbam Kishan Singh, Ngangkham Nimai Manipur Univ Dept Phys Imphal 795003 Manipur India Res Inst Sci & Technol RIST Imphal 795003 Manipur India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

We study the minimal extended seesaw mechanism with one sterile neutrino in a 3+1 framework using modular. S-3 symmetry. The active-sterile neutrino models are classified based on the assignments of S-3 representations and modular weights of the left-handed lepton doublets, right-handed neutrinos, and sterile neutrino. No scalar flavons are considered, and the flavour symmetry is broken by the vacuum expectation value (vev) of the modulus tau. For a particular set of representations of the Leptons and Higgs field, we develop eleven (11) different models based on different modular weights of charged lepton.(kL) and right-handed neutrinos (k(N)). Out of these, we consider two models, which are discriminated by carrying out the numerical analysis so that the parameter space in each model can fit the latest neutrino oscillation data at 3 sigma. The Planck cosmological bound on the upper limit of the sum of the active neutrino masses Sigma m(i) < 0.12eV is also considered. Finally, the best-fit parameters of the neutrino observables and model predictions are evaluated using the minimum chi(2) analysis.

关键词： Beyond Standard Model MES mechanism Modular S3 symmetry Sterile neutrino

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Unveiling the Impact of Generalized CP Symmetry on 2HDM and Neutrino physics

Unveiling the Impact of Generalized CP Symmetry on 2HDM and ...

引用

2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Tapender Kumar, Sanjeev Verma, Surender Cent Univ Himachal Pradesh Dept Phys & Astron Sci Dharamshala 176215 India Univ Delhi Dept Phys & Astrophys Delhi 110007 India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

We have proposed a model that incorporates the idea of generalized CP symmetries (GCP) in two-Higgs-doublet model (2HDM), with Type-I seesaw mechanism, in the leptonic sector. The imposition of GCP results in simplified scalar and Yukawa sectors leading to reduction in the number of free parameters. The framework results in stringent constraints on the Yukawa couplings yielding a model characterized by only 12 independent real parameters in the Yukawa coupling matrices. Furthermore, under the GCP symmetry, the right-handed Majorana neutrino mass matrix becomes diagonal featuring two degenerate masses. The second Higgs doublet acquires a complex vacuum expectation value (VEV) after soft breaking of the GCP symmetry which seeds the CP-violation in the model. We have investigated the phenomenology of the model considering both, normal (NH) as well as inverted (IH), hierarchies of neutrino masses. There exists an interesting interplay between possible neutrino mass hierarchy and atmospheric mixing angle, theta(23) For normal (inverted) hierarchy theta(23) is found to be in the lower (higher) octant. Further, for NH, the Dirac CP phase delta is constrained to a range of -10 degrees to 10 degrees. On the other hand, when considering IH, the model becomes inherently CP-violating with CP-violating phase delta confined to small regions near +/- 40 degrees.

关键词： CP-violation Generalized CP symmetry Neutrino phenomenology Two-Higgs-doublet model Type-I seesaw

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Probing Scalar Leptoquarks Using Neutrino-Nucleus Coherent Scattering

Probing Scalar Leptoquarks Using Neutrino-Nucleus Coherent S...

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Roy, Samiran Univ Hyderabad Sch Phys Hyderabad 500046 India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

The recent measurements of the coherent elastic neutrino-nucleus scattering (CEvNS) by the COHERENT collaboration give us a capability to examine the various new physics scenarios at low energy neutrino experiments. One such new physics is the scalar leptoquarks (LQs) that arise in many extensions of the Standard Model (SM). We consider the low-scale LQ models that forbid the rapid proton decay by construction. The hypercharges of the scalar LQs are Y = 1/6 and Y = 7/6, which are part of the two electroweak doublet fields, respectively. We constrain the LQs using the COHERENT data that is consistent with the SM prediction. We find that the COHERENT measurements can put a strong bound on the LQs couplings to SM particles over a wide range of LQ masses, and the bounds are competitive with various other experiments.

关键词： BSM CEνNS Leptoquarks

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A Modular A4 Symmetric Minimal Model for One-Loop T4-2-i Topology

A Modular A4 Symmetric Minimal Model for One-Loop T4-2-i Top...

引用

2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Kashav, Monal Verma, Surender Cent Univ Himachal Pradesh Dept Phys & Astron Sci Dharamshala India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

The one-loop neutrino mass models based on the topological features of the dimension-5 Weinberg operator have been systematically categorized into three categories. Notably, within these topological categories, the extension of canonical seesaw scenarios at the one-loop level is of interest given the current LHC run. Besides the one-loop contribution, these extensions yield a prevalent tree-level contribution to neutrino masses. Achieving a dominant one-loop contribution necessitates the amalgamation of flavor symmetries and an expanded field content. Alternatively, we propose the realization of a specific topological Lorentz structure (T4-2-i) associated with the one-loop extension of Type-II seesaw employing modular A4 symmetry. In this realization, no additional fields are required beyond those allowed by the topology itself. The modular weights play a crucial role in suppressing tree-level terms and stabilizing the particles participating in the loop (such as. N-i, rho, and phi), rendering them potential dark matter candidates.

关键词： Dark matter Modular symmetry Neutrino mass model

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Cosmological Signatures of Dirac Neutrino Portal Dark Matter

Cosmological Signatures of Dirac Neutrino Portal Dark Matter

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Das, Nayan Borah, Debasish Indian Inst Technol Guwahati Dept Phys Gauhati 781039 Assam India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

We consider a scenario where light active neutrinos are of Dirac nature and their right chiral parts act as a portal between the standard model and dark matter (DM). Depending upon this portal coupling, DM can either be in thermal or non-thermal ballpark. A gauged U(1)(B-L) symmetry accommodates right chiral parts of Dirac neutrinos naturally and ensures DM stability. Due to portal and U(1)(B-L) interactions, it is possible to have additional relativistic degrees of freedom in the form of light Dirac neutrinos which can be probed by cosmic microwave background measurements of Delta N-eff. The parameter space also remains within reach of terrestrial experiments like collider.

关键词： CMB dark matter Neutrino

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Neutrino Phenomenology in Texture Zeros of Minimal Inverse Seesaw

Neutrino Phenomenology in Texture Zeros of Minimal Inverse S...

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Gautam, Nayana Das, Mrinal Kumar Lakhimpur Girls Coll Dept Phys North Lakhimpur 787031 India Tezpur Univ Dept Phys Tezpur 784028 Assam India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

We study texture zeros of Dirac mass matrix in a minimal inverse seesaw (2, 3) model with S-4 flavor symmetry. The seesaw model is extended with the addition of two right-handed neutrinos and three sterile states in intermediate mass range. The structure of the mass matrices is obtained from S-4 symmetry. There are six possible two zero textures of the Dirac mass matrix. We study the neutrino mass and mixing within the six different textures emphasizing Dirac CP phase and the mixing angle theta(23) that may shed light on octant problem. Based on the allowed ranges of the mass and mixing with the active neutrinos, we study the viability of the different textures.

关键词： CP Phase Neutrino mass Neutrino oscillation Texture zero

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