scholarly journals A Standard Model Neutrino Oscillation

2021 ◽  
Author(s):  
Robert B. Hayes
Keyword(s):  
Standard Model ◽  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Mass Term ◽  
Solar Neutrinos ◽  
Muon Decay ◽  
Neutrino Flavor

This work argues the mass term in the neutrino wavefunction propagator is due to entanglement with its associated origins. The implication being that neutrino flavor is conserved in weak processes and shared among all particles emanating from the last interaction with a nucleon. In so doing, the neutrino mass propagator is real but not ascribed to the neutrino outside of entanglement. The proposed theory will be readily testable in that reactor and solar neutrinos will oscillate but both muon decay neutrinos and accelerator neutrinos created by pure lepton interactions will not oscillate..

ELECTROWEAK THEORY AND THE NEUTRINO-MASS AND NEUTRINO-OSCILLATION QUESTIONS

2007 ◽  
Vol 22 (12) ◽  
pp. 853-865 ◽  
Author(s):  
G. ZIINO
Keyword(s):  
Standard Model ◽  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Parity Violation ◽  
Crucial Role ◽  
Tau Lepton ◽  
Electroweak Theory ◽  
Mass Eigenstates ◽  
The Standard Model

It is shown that both conjectures of neutrino mass and neutrino oscillation can be made really well-grounded within the Standard Model provided that one adopts a recent new version of the electroweak scheme spontaneously giving also a fundamental explanation for the so-called "maximal parity-violation" effect. A crucial role is played by the prediction of two distinct, scalar and pseudoscalar, replicas of (electron, muon, and tau) lepton numbers that could fully account for an actual non-coincidence between neutrino mass-eigenstates and gauge-eigenstates.

scholarly journals SPREADING OF WAVE PACKETS FOR NEUTRINO OSCILLATIONS

2014 ◽  
Vol 29 (02) ◽  
pp. 1450007 ◽  
Author(s):  
Y. F. PÉREZ ◽  
C. J. QUIMBAY
Keyword(s):  
Field Theory ◽  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Wave Packets ◽  
Longitudinal Dispersion ◽  
Third Order ◽  
Mass Eigenstates ◽  
Neutrino Source ◽  
Neutrino Flavor

The effects originated in dispersion with time on spreading of wave packets for the time-integrated two-flavor neutrino oscillation probabilities in vacuum are studied in the context of a field theory treatment. The neutrino flavor states are written as superpositions of neutrino mass eigenstates which are described by localized wave packets. This study is performed for the limit of nearly degenerate masses and considering an expansion of the energy until third-order in the momentum. We obtain that the time-integrated neutrino oscillation probabilities are suppressed by a factor 1/L2 for the transversal and longitudinal dispersion regimes, where L is the distance between the neutrino source and the detector.

scholarly journals Neutrino–antineutrino mass splitting in the Standard Model: Neutrino oscillation and baryogenesis

2015 ◽  
Vol 30 (21) ◽  
pp. 1530016 ◽  
Author(s):  
Kazuo Fujikawa ◽  
Anca Tureanu
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Mass Term ◽  
Mass Splitting ◽  
Effective Theory ◽  
K Meson ◽  
Electron Positron ◽  
The Standard Model ◽  
Experimental Bound ◽  
The One

By adding a neutrino mass term to the Standard Model, which is Lorentz and [Formula: see text] invariant but nonlocal to evade CPT theorem, it is shown that nonlocality within a distance scale of the Planck length, that may not be fatal to unitarity in generic effective theory, can generate the neutrino–antineutrino mass splitting of the order of observed neutrino mass differences, which is tested in oscillation experiments, and non-negligible baryon asymmetry depending on the estimate of sphaleron dynamics. The one-loop order induced electron–positron mass splitting in the Standard Model is shown to be finite and estimated at [Formula: see text], well below the experimental bound [Formula: see text]. The induced CPT violation in the K-meson in the Standard Model is expected to be even smaller and well below the experimental bound [Formula: see text].

Calculation of the μ → eγ muon decay in the small-neutrino-mass limit

2014 ◽  
Vol 92 (12) ◽  
pp. 1587-1591
Author(s):  
Jian-Ping Bu ◽  
Yu-Min Liang ◽  
Xue-Wen Gu
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Muon Decay ◽  
Mass Limit ◽  
The Standard Model ◽  
Accidental Symmetry ◽  
Lepton Flavour

The μ → eγ decay is strictly forbidden in the Standard Model, where the lepton flavour is conserved as an accidental symmetry, but in extensions of the Standard Model the lepton flavour is generally no longer conserved, so that decay can take place. In this paper we calculate the amplitude, in an Rξ gauge, of muon decay in the small-neutrino-mass limit. The result, in which ξ-dependence is cancelled, is different from the amplitude and the technical points obtained in previous work.

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.

NEUTRINO MASS SPECULATION ON THE EVENTS OF NEUTRINOS FROM THE SUPERNOVA LMC 1987 A

1987 ◽  
Vol 02 (12) ◽  
pp. 905-911 ◽  
Author(s):  
H. HUZITA
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Energy Threshold ◽  
Energy Correlation ◽  
Neutrino Oscillation Experiment ◽  
Oscillation Experiment

The interactions of neutrinos from the supernova LMC 1987 A by Kamiokande II apparatus have a curious character. Time to energy correlation has two separated groups. If this is not completely by chance each group corresponds to non zero neutrino mass 3.4 ± 0.6 and 23. ± 4. eV . The latter is not consistent with the results of neutrino oscillation experiment. IMB data are not contrary to the Kamiokas considering IMB's higher energy threshold.

scholarly journals HIDING THE EXISTENCE OF A FAMILY SYMMETRY IN THE STANDARD MODEL

2005 ◽  
Vol 20 (36) ◽  
pp. 2767-2774 ◽  
Author(s):  
ERNEST MA
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Mass Matrix ◽  
Higgs Sector ◽  
Higgs Doublet ◽  
Neutrino Mass Matrix ◽  
Tree Level ◽  
Family Symmetry ◽  
The Standard Model

If a family symmetry exists for the quarks and leptons, the Higgs sector is expected to be enlarged to be able to support the transformation properties of this symmetry. There are, however, three possible generic ways (at tree level) of hiding this symmetry in the context of the Standard Model with just one Higgs doublet. All three mechanisms have their natural realizations in the unification symmetry E6 and one in SO (10). An interesting example based on SO (10)×A4 for the neutrino mass matrix is discussed.

scholarly journals The history of the muon (g-2) experiments

2019 ◽  
Author(s):  
B. Lee Roberts
Keyword(s):  
Standard Model ◽  
Quantum Electrodynamics ◽  
National Laboratory ◽  
New Physics ◽  
Brookhaven National Laboratory ◽  
Muon Decay ◽  
Higgs Bosons ◽  
The Standard Model ◽  
History Of ◽  
First Time

I discuss the history of the muon (g-2)(g−2) measurements, beginning with the Columbia-Nevis measurement that observed parity violation in muon decay, and also measured the muon gg-factor for the first time, finding g_\mu=2gμ=2. The theoretical (Standard Model) value contains contributions from quantum electrodynamics, the strong interaction through hadronic vacuum polarization and hadronic light-by-light loops, as well as the electroweak contributions from the WW, ZZ and Higgs bosons. The subsequent experiments, first at Nevis and then with increasing precision at CERN, measured the muon anomaly a_\mu = (g_\mu-2)/2aμ=(gμ−2)/2 down to a precision of 7.3 parts per million (ppm). The Brookhaven National Laboratory experiment E821 increased the precision to 0.54 ppm, and observed for the first time the electroweak contributions. Interestingly, the value of a_\muaμ measured at Brookhaven appears to be larger than the Standard Model value by greater than three standard deviations. A new experiment, Fermilab E989, aims to improve on the precision by a factor of four, to clarify whether this result is a harbinger of new physics entering through loops, or from some experimental, statistical or systematic issue.

scholarly journals $$U(1)_{B-L}$$ extension of the standard model with $$S_3$$ symmetry

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
V. V. Vien ◽  
H. N. Long ◽  
A. E. Cárcamo Hernández
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Liquid Scintillator ◽  
High Energy ◽  
Fermion Mass ◽  
Physical Parameters ◽  
Type I ◽  
Inverted Hierarchy ◽  
Quark Masses ◽  
Quark Sector

Abstract We propose a renormalizable $$B-L$$B-L Standard Model (SM) extension based on $$S_3$$S3 symmetry which successfully accommodates the observed fermion mass spectra and flavor mixing patterns as well as the CP violating phases. The small masses for the light active neutrinos are generated through a type I seesaw mechanism. The obtained physical parameters in the lepton sector are well consistent with the global fit of neutrino oscillations (Esteban et al. in J High Energy Phys 01:106, 2019) for both normal and inverted neutrino mass orderings. The model also predicts effective neutrino mass parameters of $${\langle m_{ee}\rangle }= {1.02\times 10^{-2}}\,{\mathrm {eV}},\, m_{\beta }= {1.25}\times 10^{-2}\,{\mathrm {eV}}$$⟨mee⟩=1.02×10-2eV,mβ=1.25×10-2eV for normal hierarchy (NH) and $${\langle m_{ee}\rangle } ={5.03}\times 10^{-2}\, {\mathrm {eV}},\, m_{\beta } ={5.05}\times 10^{-2}\, {\mathrm {eV}}$$⟨mee⟩=5.03×10-2eV,mβ=5.05×10-2eV for inverted hierarchy (IH) which are all well consistent with the future large and ultra-low background liquid scintillator detectors which has been discussed in Ref. (Zhao et al. in Chin Phys C 41(5):053001, 2017) or the limit of the effective neutrino mass can be reached by the planning of future experiments. The model results are consistent with and successfully accommodate the recent experimental values of the physical observables of the quark sector, including the six quark masses, the quark mixing angles and the CP violating phase in the quark sector.

NEUTRINO MASSES WITH DYNAMICAL ELECTROWEAK SYMMETRY BREAKING

2003 ◽  
Vol 18 (22) ◽  
pp. 3935-3946 ◽  
Author(s):  
THOMAS APPELQUIST
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Neutrino Mass ◽  
Electroweak Symmetry Breaking ◽  
Light Neutrino ◽  
Neutrino Masses ◽  
Electroweak Symmetry ◽  
Explicit Model ◽  
Dirac Neutrino ◽  
Mass Terms

In this talk I discuss the problem of accounting for light neutrino masses in theories with dynamical electroweak symmetry breaking. I will first describe this problem generally in a class of extended technicolor (ETC) models, describing the full set of Dirac and Majorana masses that arise in such theories. I will then present an explicit model exhibiting a combination of suppressed Dirac masses and a seesaw involving dynamically generated condensates of standard-model singlet, ETC-nonsinglet fermions. Because of the suppression of the Dirac neutrino mass terms, a seesaw yielding realistic neutrino masses does not require superheavy Majorana masses; indeed, the Majorana masses are typically much smaller than the largest ETC scale.

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