scholarly journals Neutrino mass matrices with three or four vanishing cofactors and nondiagonal charged lepton sector

2017 ◽  
Vol 96 (9) ◽  
Author(s):  
S. Dev ◽  
Desh Raj ◽  
Radha Raman Gautam
Keyword(s):  
Neutrino Mass ◽  
Charged Lepton ◽  
Lepton Sector ◽  
Mass Matrices ◽  
Charged Lepton Sector

scholarly journals θ13, μτ SYMMETRY BREAKING AND NEUTRINO YUKAWA TEXTURES

2013 ◽  
Vol 28 (24) ◽  
pp. 1350118 ◽  
Author(s):  
BISWAJIT ADHIKARY ◽  
AMBAR GHOSAL ◽  
PROBIR ROY
Keyword(s):  
Symmetry Breaking ◽  
Neutrino Mass ◽  
Charged Lepton ◽  
Heavy Neutrino ◽  
Type I ◽  
Mixing Angles ◽  
Order Analysis ◽  
A Value ◽  
Mass Matrices ◽  
Best Fit

Within the type-I seesaw and in the basis where charged lepton and heavy neutrino mass matrices are real and diagonal, μτ symmetric four and three zero neutrino Yukawa textures are perturbed by lowest order μτ symmetry breaking terms. These perturbations are taken to be the most general ones for those textures. For quite small values of those symmetry breaking parameters, permitting a lowest order analysis, current best-fit ranges of neutrino mass squared differences and mixing angles are shown to be accommodable, including a value of θ13 in the observed range, provided all the light neutrinos have an inverted mass ordering.

scholarly journals CAN MASSLESS AND LIGHT YUKAWAONS BE HARMLESS?

2010 ◽  
Vol 25 (08) ◽  
pp. 1725-1738 ◽  
Author(s):  
YOSHIO KOIDE
Keyword(s):  
Yukawa Coupling ◽  
Charged Lepton ◽  
Vacuum Expectation ◽  
Coupling Constants ◽  
Flavor Symmetry ◽  
Lepton Sector ◽  
Expectation Values ◽  
Charged Lepton Sector

In the so-called yukawaon model, where the effective Yukawa coupling constants [Formula: see text] are given by vacuum expectation values (VEV's) of gauge singlet scalars (yukawaons) Yf with 3×3 components, i.e. [Formula: see text], massless (and light) scalars appear because a global flavor symmetry is assumed. In order to demonstrate whether such massless scalars in the yukawaon model are harmless or not, yukawaon masses are explicitly estimated, as an example, in the charged lepton sector.

scholarly journals NEUTRINO MASS MATRIX FROM Δ(27) SYMMETRY

2006 ◽  
Vol 21 (25) ◽  
pp. 1917-1921 ◽  
Author(s):  
ERNEST MA
Keyword(s):  
Neutrino Mass ◽  
Simple Form ◽  
Charged Lepton ◽  
Mass Matrix ◽  
Discrete Subgroup ◽  
Majorana Neutrino ◽  
Neutrino Mass Matrix ◽  
Mass Matrices ◽  
Majorana Neutrino Mass

The discrete subgroup Δ(27) of SU(3) has some interesting properties which may be useful for understanding charged-lepton and neutrino mass matrices. Assigning leptons to the 3 and [Formula: see text] representations of Δ(27), a simple form of the Majorana neutrino mass matrix is obtained and compared to present data.

scholarly journals Can neutrino mixings arise from the charged lepton sector?

2004 ◽  
Vol 689 (1-2) ◽  
pp. 157-171 ◽  
Author(s):  
Guido Altarelli ◽  
Ferruccio Feruglio ◽  
Isabella Masina
Keyword(s):  
Charged Lepton ◽  
Lepton Sector ◽  
Charged Lepton Sector

LEPTON FLAVOUR VIOLATION BEYOND THE PRESENT LIMITS

2014 ◽  
Vol 35 ◽  
pp. 1460391
Author(s):  
LORENZO CALIBBI
Keyword(s):  
Charged Lepton ◽  
Limit Set ◽  
Lepton Sector ◽  
Flavor Violation ◽  
Theoretical Predictions ◽  
The Status ◽  
Flavour Violation ◽  
Charged Lepton Sector ◽  
Lepton Flavour

The status of the theoretical predictions for processes with flavor violation in the charged lepton sector is discussed in the light of the recent determination of the reactor angle θ13, as well as the improved limit set by MEG on BR (μ → eγ).

scholarly journals Relating lepton mixing angles with lepton mass hierarchy

2016 ◽  
Vol 31 (04n05) ◽  
pp. 1650002
Author(s):  
Debasish Borah
Keyword(s):  
Neutrino Mass ◽  
Charged Lepton ◽  
Mass Matrix ◽  
Neutrino Masses ◽  
Mass Hierarchy ◽  
Mixing Angle ◽  
Mixing Angles ◽  
Mass Matrices ◽  
Model Independent ◽  
The Difference

We revisit the possibility of relating lepton mixing angles with lepton mass hierarchies in a model-independent way. Guided by the existence of such relations in the quark sector, we first consider all the mixing angles, both in charged lepton and neutrino sectors to be related to the respective mass ratios. This allows us to calculate the leptonic mixing angles observed in neutrino oscillations as functions of the lightest neutrino mass. We show that for both normal and inverted hierarchical neutrino masses, this scenario does not give rise to correct leptonic mixing angles. We then show that correct leptonic mixing angles can be generated with normal hierarchical neutrino masses if the relation between mixing angle and mass ratio is restricted to 1–2 and 1–3 mixing in both charged lepton and neutrino sectors leaving the 2–3 mixing angles as free parameters. We then restrict the lightest neutrino mass as well as the difference between 2–3 mixing angles in charged lepton and neutrino sectors from the requirement of producing correct leptonic mixing angles. We constrain the lightest neutrino mass to be around 0.002 eV and leptonic Dirac CP phase [Formula: see text] such that [Formula: see text]. We also construct the leptonic mass matrices in terms of 2–3 mixing angles and lightest neutrino mass and briefly comment on the possibility of realizing texture zeros in the neutrino mass matrix.

scholarly journals Charged lepton flavor violation in light of the muon magnetic moment anomaly and colliders

2021 ◽  
Vol 81 (9) ◽  
Author(s):  
Tong Li ◽  
Michael A. Schmidt ◽  
Chang-Yuan Yao ◽  
Man Yuan
Keyword(s):  
Magnetic Moment ◽  
Charged Lepton ◽  
New Physics ◽  
Lepton Flavor Violation ◽  
Lepton Sector ◽  
Gauge Invariant ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Muon Magnetic Moment ◽  
Charged Lepton Sector

AbstractAny observation of charged lepton flavor violation (CLFV) implies the existence of new physics beyond the SM in charged lepton sector. CLFV interactions may also contribute to the muon magnetic moment and explain the discrepancy between the SM prediction and the recent muon $$g-2$$ g - 2 precision measurement at Fermilab. We consider the most general SM gauge invariant Lagrangian of $$\Delta L=0$$ Δ L = 0 bileptons with CLFV couplings and investigate the interplay of low-energy precision experiments and colliders in light of the muon magnetic moment anomaly. We go beyond previous work by demonstrating the sensitivity of the LHC, the MACE experiment, a proposed muonium-antimuonium conversion experiment, and a muon collider. Currently-available LHC data is already able to probe unexplored parameter space via the CLFV process $$pp\rightarrow \gamma ^*/Z^*\rightarrow \ell _1^\pm \ell _1^\pm \ell _2^\mp \ell _2^\mp $$ p p → γ ∗ / Z ∗ → ℓ 1 ± ℓ 1 ± ℓ 2 ∓ ℓ 2 ∓ .

scholarly journals LEPTON FLAVOR VIOLATION DECAYS OF VECTOR MESONS IN UNPARTICLE PHYSICS

2012 ◽  
Vol 27 (30) ◽  
pp. 1250172 ◽  
Author(s):  
KE-SHENG SUN ◽  
TAI-FU FENG ◽  
LI-NA KOU ◽  
FEI SUN ◽  
TIE-JUN GAO ◽  
...  
Keyword(s):  
Charged Lepton ◽  
Conversion Rate ◽  
Lepton Flavor Violation ◽  
Vector Mesons ◽  
Lepton Sector ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Dimension Formula ◽  
Upper Limit ◽  
Charged Lepton Sector

We investigate the lepton flavor violation decays of vector mesons in the scenario of the unparticle physics by considering the constraint from μ-e conversion. In unparticle physics, the predictions of LFV decays of vector mesons depend strongly on the scale dimension [Formula: see text]. The predictions of LFV decays of vector mesons can reach the detective sensitivity in experiment in region of [Formula: see text], while the prediction of μ-e conversion rate can meet the experimental upper limit. For the searching of the lepton flavor violation processes of charged lepton sector in experiment, the process ϒ→eμ may be a promising one to be observed.

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