scholarly journals New developments in neutrino physics

2020 ◽  
Vol 9 ◽  
pp. 40
Author(s):  
W. M. Alberico ◽  
S. M. Bilenky
Keyword(s):  
Neutrino Physics ◽  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Phenomenological Analysis ◽  
Neutrino Mixing ◽  
New Developments ◽  
Massive Neutrinos

A review of the problems of neutrino mass, mixing and oscillations is given. Possible phenomenological schemes of neutrino mixing are discussed. The most important consequences of neutrino mixing-neutrino oscillations are considered in some detail. The data of atmospheric, solar and LSND experiments are discussed. The results of phenomenological analysis of the data under the assumption of the mixing of three and four massive neutrinos are briefly presented.

scholarly journals NEUTRINO OSCILLATIONS AND THE EXACT PARITY MODEL

1994 ◽  
Vol 09 (02) ◽  
pp. 169-179 ◽  
Author(s):  
R. FOOT
Keyword(s):  
Neutrino Mass ◽  
General Result ◽  
Neutrino Oscillations ◽  
Mass Matrix ◽  
Atmospheric Neutrino ◽  
Solar Neutrinos ◽  
Specific Model ◽  
Neutrino Mixing ◽  
Mixing Angles ◽  
Significant Deficit

We re-examine neutrino oscillations in exact parity models. Previously it was shown in a specific model that large neutrino mixing angles result. We show here that this is a general result of neutrino mixing in exact parity models provided that the neutrino mass matrix is real. In this case, the effects of neutrino mixing in exact parity models is such that the probability of a given weak eigenstate remaining in that eigenstate averages to less than half when averaged over many oscillations. This result is interesting in view of the accumulating evidence for a significant deficit in the number of solar neutrinos. It may also be of relevance to the atmospheric neutrino anomaly.

scholarly journals The Nature of Massive Neutrinos

2013 ◽  
Vol 2013 ◽  
pp. 1-20 ◽  
Author(s):  
S. T. Petcov
Keyword(s):  
Neutrino Mass ◽  
Current Data ◽  
Future Research ◽  
Type I ◽  
Neutrino Mixing ◽  
Mass Generation ◽  
Triplet Model ◽  
Majorana Neutrinos ◽  
Massive Neutrinos ◽  
Neutrino Mass Generation

The compelling experimental evidences for oscillations of solar, reactor, atmospheric, and accelerator neutrinos imply the existence of 3-neutrino mixing in the weak charged lepton current. The current data on the 3-neutrino mixing parameters are summarised and the phenomenology of 3-νmixing is reviewed. The properties of massive Majorana neutrinos and of their various possible couplings are discussed in detail. Two models of neutrino mass generation with massive Majorana neutrinos—the type I see-saw and the Higgs triplet model—are briefly reviewed. The problem of determining the nature, Dirac or Majorana, of massive neutrinos is considered. The predictions for the effective Majorana mass|〈m〉|in neutrinoless double-beta-((ββ)0ν-) decay in the case of 3-neutrino mixing and massive Majorana neutrinos are summarised. The physics potential of the experiments, searching for(ββ)0ν-decay for providing information on the type of the neutrino mass spectrum, on the absolute scale of neutrino masses, and on the Majorana CP-violation phases in the PMNS neutrino mixing matrix, is also briefly discussed. The opened questions and the main goals of future research in the field of neutrino physics are outlined.

scholarly journals ON THE ABSOLUTE VALUE OF THE NEUTRINO MASS

2011 ◽  
Vol 26 (21) ◽  
pp. 1555-1559 ◽  
Author(s):  
DRAGAN SLAVKOV HAJDUKOVIC
Keyword(s):  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Upper Bounds ◽  
Neutrino Mixing ◽  
Absolute Value ◽  
The Absolute ◽  
Good Agreement

The neutrino oscillations probabilities depend on mass squared differences; in the case of three-neutrino mixing, there are two independent differences, which have been measured experimentally. In order to calculate the absolute masses of neutrinos, we have conjectured a third relation, in the form of a sum of squared masses. The calculated masses look plausible and are in good agreement with the upper bounds coming from astrophysics.

scholarly journals THEORETICAL OVERVIEW OF NEUTRINO PROPERTIES

2008 ◽  
Vol 23 (26) ◽  
pp. 4255-4272 ◽  
Author(s):  
ZHI-ZHONG XING
Keyword(s):  
Mass Spectrum ◽  
Neutrino Physics ◽  
Neutrino Oscillations ◽  
Ultrahigh Energy ◽  
Neutrino Telescopes ◽  
Flavor Oscillations ◽  
The Road ◽  
Neutrino Astrophysics ◽  
Massive Neutrinos ◽  
Theoretical Overview

I give an overview of some basic properties of massive neutrinos. The first part of this talk is devoted to three fundamental questions about three known neutrinos and to their flavor issues — the mass spectrum, mixing pattern and CP violation. The second part of this talk is to highlight a few hot topics at the frontiers of neutrino physics and neutrino astrophysics, including the naturalness and testability of TeV seesaw mechanisms at the LHC, effects of nonstandard interactions on neutrino oscillations, flavor distributions of ultrahigh-energy cosmic neutrinos at neutrino telescopes, collective flavor oscillations of supernova neutrinos, flavor effects in thermal leptogenesis, the GSI anomaly and Mössbauer neutrino oscillations, and so on. I finally make some concluding remarks for the road ahead.

scholarly journals New results and perspectives in neutrino physics

2019 ◽  
Vol 212 ◽  
pp. 01005
Author(s):  
Yury Kudenko
Keyword(s):  
Neutrino Physics ◽  
Cp Violation ◽  
Beta Decay ◽  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Mass Measurement ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Sterile Neutrinos ◽  
Neutrino Mass Measurement

A brief review of new results and perspectives in neutrino physics is presented. An emphasis on a search for CP violation in neutrino oscillations and a search for sterile neutrinos is given. Status of measurement of the direct neutrino mass measurement and searches for neutrinoless double beta decay are also discussed.

scholarly journals GENERALIZED FRIEDBERG-LEE MODEL FOR NEUTRINO MASSES AND LEPTONIC CP VIOLATION FROM μ-τ SYMMETRY BREAKING

2008 ◽  
Vol 23 (21) ◽  
pp. 3384-3387 ◽  
Author(s):  
ZHI-ZHONG XING ◽  
HE ZHANG ◽  
SHUN ZHOU
Keyword(s):  
Cp Violation ◽  
Symmetry Breaking ◽  
Neutrino Mass ◽  
Mass Matrix ◽  
Neutrino Masses ◽  
Neutrino Mixing ◽  
Mass Model ◽  
Lee Model ◽  
Massive Neutrinos ◽  
Free Parameters

Assuming the Majorana nature of massive neutrinos, we generalize the Friedberg-Lee neutrino mass model to include CP violation in the neutrino mass matrix Mν. The most general case with all the free parameters of Mν being complex is discussed. We show that a favorable neutrino mixing pattern (with θ12 ≈ 35.3°, θ23 = 45°, θ13 ≠ 0° and δ = 90°) can naturally be derived from Mν, if it has an approximate or softly-broken μ-τ symmetry. We also point out a different way to obtain the nearly tri-bimaximal neutrino mixing pattern with δ = 0° and non-vanishing Majorana phases.

scholarly journals Phenomenology of Neutrino Mixing in Vacuum and Matter

2013 ◽  
Vol 2013 ◽  
pp. 1-15
Author(s):  
A. Upadhyay ◽  
M. Batra
Keyword(s):  
Neutrino Oscillations ◽  
Atmospheric Neutrino ◽  
Current Status ◽  
Mass Hierarchy ◽  
Neutrino Mixing ◽  
Fundamental Theory ◽  
Flavor Changing ◽  
Massive Neutrinos ◽  
Neutrino Experiments

The current status and some perspectives of the phenomenology of massive neutrinos is reviewed. We start with the phenomenology of neutrino oscillations in vacuum and in matter. We summarize the results of neutrino experiments using solar, atmospheric. The fundamental theory of flavor changing neutrinos that has confirmed the neutrino oscillations and the various parameters affecting these oscillations have been discussed in detail. Specifically we will take the solar and atmospheric neutrino case. The oscillation plots will be discussed in detail, based on their behavior in vacuum and matter. Both normal and inverted mass hierarchy hypotheses are tested and both are consistent with observation. Finally the sensitivity of theta 13 over these probability oscillations has been analyzed and commented.

scholarly journals PROGRESS IN THE PHYSICS OF MASSIVE NEUTRINOS

2003 ◽  
Vol 12 (05) ◽  
pp. 569-647 ◽  
Author(s):  
V. BARGER ◽  
D. MARFATIA ◽  
K. WHISNANT
Keyword(s):  
Beta Decay ◽  
Neutrino Mass ◽  
Large Scale ◽  
Neutrino Oscillations ◽  
Mass Scale ◽  
Double Beta Decay ◽  
Current Status ◽  
Unknown Parameters ◽  
Massive Neutrinos ◽  
The Impact

The current status of the physics of massive neutrinos is reviewed with a forward-looking emphasis. The article begins with the general phenomenology of neutrino oscillations in vacuum and matter and documents the experimental evidence for oscillations of solar, reactor, atmospheric and accelerator neutrinos. Both active and sterile oscillation possibilities are considered. The impact of cosmology (BBN, CMB, leptogenesis) and astrophysics (supernovae, highest energy cosmic rays) on neutrino observables and vice versa, is evaluated. The predictions of grand unified, radiative and other models of neutrino mass are discussed. Ways of determining the unknown parameters of three-neutrino oscillations are assessed, taking into account eight-fold degeneracies in parameters that yield the same oscillation probabilities, as well as ways to determine the absolute neutrino mass scale (from beta-decay, neutrinoless double-beta decay, large scale structure and Z-bursts). Critical unknowns at present are the amplitude of νμ→νe oscillations and the hierarchy of the neutrino mass spectrum; the detection of CP violation in the neutrino sector depends on these and on an unknown phase. The estimated neutrino parameter sensitivities at future facilities (reactors, superbeams, neutrino factories) are given. The overall agenda of a future neutrino physics program to construct a bottom-up understanding of the lepton sector is presented.

scholarly journals Near maximal atmospheric neutrino mixing in neutrino mass models with two texture zeros

2014 ◽  
Vol 90 (1) ◽  
Author(s):  
S. Dev ◽  
R. R. Gautam ◽  
Lal Singh ◽  
Manmohan Gupta
Keyword(s):  
Neutrino Mass ◽  
Atmospheric Neutrino ◽  
Neutrino Mixing ◽  
Neutrino Mass Models

scholarly journals Effect on Jarlskog Determinant Above the GUT Scale Within Four Flavor Neutrino Framework

2021 ◽  
Author(s):  
Vivek Kumar Nautiyal ◽  
Bipin Singh Koranga
Keyword(s):  
Neutrino Mass ◽  
Scale Effects ◽  
Mass Matrix ◽  
Gravitational Interaction ◽  
Planck Scale ◽  
Neutrino Mixing ◽  
Gut Scale ◽  
Jarlskog Determinant ◽  
Planck Scale Effects ◽  
Four Flavor

AbstractWe study the Planck scale effects on Jarlskog determiant in the four flavor framework. On electroweak symmetry breaking, quantum gravitational effects lead to an effective SU(2) × U(1) invariant dimension-5 Lagrangian including neutrino and Higgs forces, which perturbed the neutrino mass term and produce an extra terms in the neutrino mass matrix. We consider that gravitational interaction is independent from flavor and compute the Jarlskog determiant due to Planck scale effects. In the case of leptonic sector, the strentgh of CP violation is measured by Jarlskog determiant. We applied our approach to study Jarlskog determinant in the four flavor neutrino mixing above the GUT scale.

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