scholarly journals μ − τ reflection symmetry in the standard parametrization and contributions from charged lepton sector

2021 ◽  
Vol 815 ◽  
pp. 136119
Author(s):  
Chandan Duarah
Keyword(s):  
Charged Lepton ◽  
Reflection Symmetry ◽  
Lepton Sector ◽  
Charged Lepton Sector

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 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 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.

scholarly journals NEUTRINO TRIBIMAXIMAL MIXING FROM A4 ALONE

2010 ◽  
Vol 25 (26) ◽  
pp. 2215-2221 ◽  
Author(s):  
ERNEST MA
Keyword(s):  
Charged Lepton ◽  
Extra Dimensions ◽  
Lepton Number ◽  
Lepton Sector ◽  
Neutrino Sector ◽  
Renormalizable Model ◽  
Charged Lepton Sector

Neutrino tribimaximal mixing is obtained from the breaking of A4 to Z3 in the charged-lepton sector and to Z2 in the neutrino sector. To enforce this conflicting pattern, extra particles and symmetries are usually invoked, often accompanied by nonrenormalizable interactions and even extra dimensions. It is shown here in a specific renormalizable model how A4 alone will accomplish this, with only the help of lepton number.

scholarly journals Implications of SU(2)L gauge invariance for constraints on Lorentz violation

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Andreas Crivellin ◽  
Fiona Kirk ◽  
Marco Schreck
Keyword(s):  
Charged Lepton ◽  
Gamma Ray ◽  
Lorentz Invariance ◽  
Lorentz Violation ◽  
Lepton Sector ◽  
Standard Model Extension ◽  
Neutrino Sector ◽  
Model Extension ◽  
Charged Leptons ◽  
Charged Lepton Sector

Abstract Lorentz invariance may only be broken far above the electroweak scale, since violations are experimentally stringently constrained. Therefore, the Standard-Model Extension parameterizing Lorentz violation (LV) via (higher-dimensional) field theory operators is manifestly SU(2)L gauge-invariant. As a consequence, LV in neutrinos implies LV in charged leptons and vice versa. This allows us to obtain estimated sensitivities for flavour-changing operators in the charged-lepton sector from neutrino oscillations as well as sensitivities for flavour-diagonal neutrino effects from high-precision electron experiments. We also apply this method to an analysis of time-of-flight data for neutrinos (detected by IceCube) and photons from gamma ray bursts where discrepancies have been observed. Our conclusion is that an explanation of the arrival time difference between neutrino and photon events by dim-5 operators in the neutrino sector would lead to unacceptably large LV effects in the charged-lepton sector.

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