Calculation of the Branching Ratio of the Process μ→ 3e in the Hung Model

2012 ◽  
Vol 490-495 ◽  
pp. 315-318
Author(s):  
Jian Ping Bu ◽  
Bei Jia
Keyword(s):  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Electroweak Scale ◽  
Seesaw Mechanism ◽  
Lepton Flavor ◽  
Flavor Structure

Rich phenomenology is generally expected if the heavy neutrinos responsible via the seesaw mechanism for the small neutrino mass observed in neutrino oscillations are not much heavier than the electroweak scale. A model with this feature built in has been suggested recently by Hung. We analyze the lepton flavor structure in gauge interactions and calculate the branching ratios for the decays due to the gauge interactions in this model.

Calculation of the Branching Ratio of the Process μ→eγ in a Model of Electroweak-Scale Right-Handed Neutrinos

2012 ◽  
Vol 490-495 ◽  
pp. 152-156
Author(s):  
Jian Ping Bu ◽  
Bei Jia
Keyword(s):  
Neutrino Mass ◽  
Rare Decays ◽  
Neutrino Oscillations ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Electroweak Scale ◽  
Seesaw Mechanism ◽  
Lepton Flavor ◽  
Flavor Structure

Rich phenomenology is generally expected if the heavy neutrinos responsible via the seesaw mechanism for the small neutrino mass observed in neutrino oscillations are not much heavier than the electroweak scale. A model with this feature built in has been suggested recently by Hung. We analyze the lepton flavor structure in gauge interactions and calculate the branching ratios for the rare decays due to the gauge interactions in this model.

scholarly journals Lepton-flavor-violating decays of the SM-like Higgs boson $h\rightarrow e_ie_j$, and $e_i \rightarrow e_j\, \gamma $ in a flipped 3-3-1 model

2020 ◽  
Vol 2020 (4) ◽  
Author(s):  
T T Hong ◽  
H T Hung ◽  
H H Phuong ◽  
L T T Phuong ◽  
L T Hue
Keyword(s):  
Higgs Boson ◽  
Branching Ratio ◽  
High Energy ◽  
Branching Ratios ◽  
The Other ◽  
Experimental Limit ◽  
Lepton Flavor ◽  
The Standard Model ◽  
Charged Leptons ◽  
O 10

Abstract In the framework of the flipped 3-3-1 model introduced recently [R. M. Fonseca and M. Hirsch, J. High Energy Phys. 1608, 003 (2016)], the lepton-flavor-violating (LFV) decay $\mu \rightarrow 3e$ was predicted to have a large branching ratio (Br) close to the recent experimental limit. We will show that the Br of LFV decays of the standard-model-like (SM-like) Higgs boson decays (LFVHD) Br$(h\rightarrow e_ae_b)$ may also be large. Namely, Br$(h\rightarrow \mu\tau,e\tau)$ can reach values of $\mathcal{O}(10^{-4}){-}\mathcal{O}(10^{-5})$, which will reach the upcoming experimental sensitivities. On the other hand, for LFV decays of charged leptons (cLFV) $(e_b\rightarrow e_a\gamma)$, the branching ratios are well below experimental bounds.

scholarly journals STRATEGIES TO LINK TINY NEUTRINO MASSES WITH HUGE MISSING MASS OF THE UNIVERSE

2011 ◽  
Vol 26 (15) ◽  
pp. 2461-2485 ◽  
Author(s):  
Y. FARZAN
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Rare Decays ◽  
Neutrino Masses ◽  
Kaon Decay ◽  
Electroweak Scale ◽  
Missing Mass ◽  
Lepton Flavor ◽  
Scale Models ◽  
The Universe

With the start of the LHC, interest in electroweak scale models for the neutrino mass has grown. In this paper, we review two specific models that simultaneously explain neutrino masses and provide a suitable DM candidate. We discuss the implications of these models for various observations and experiments including the LHC, Lepton Flavor Violating (LFV) rare decays, direct and indirect dark matter searches and kaon decay.

scholarly journals LEPTON FLAVOR VIOLATING DECAY $Z\to\ell^\pm_i\ell^\mp_j$ IN THE 331 MODEL

2011 ◽  
Vol 26 (24) ◽  
pp. 4171-4185 ◽  
Author(s):  
I. CORTÉS-MALDONADO ◽  
A. MOYOTL ◽  
G. TAVARES-VELASCO
Keyword(s):  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Lepton Flavor ◽  
Loop Level ◽  
Current Limit ◽  
Z Decays ◽  
The One ◽  
Doubly Charged

We study the lepton flavor violating (LFV) decays [Formula: see text](ℓi,j = e,μ,τ) in the framework of the minimal 331 model. The main contributions arise at the one-loop level via a doubly charged bilepton with general LFV couplings. We obtain an estimate for the corresponding branching ratios by using the bounds on the LFV couplings of the doubly charged bilepton from the current experimental limits on the decays ℓi → ℓjγ and [Formula: see text]. A bound on the bilepton mass is also obtained through the current limit on the anomalous magnetic moment of the muon. It is found that the bilepton contributions to LFV Z decays are not expected to be at the reach of experimental detection. In particular, the branching ratio for the Z → μ±τ∓ decay is below the 10-10 level for a bilepton mass of the order of 500 GeV.

Calculation of Decay μ → eγ in Small Neutrino Mass Limit in a Model of Right-Handed Neutrinos

2012 ◽  
Vol 490-495 ◽  
pp. 2196-2200
Author(s):  
Jian Ping Bu ◽  
Bei Jia
Keyword(s):  
Neutrino Mass ◽  
Decay Amplitude ◽  
Mass Limit ◽  
Electroweak Scale ◽  
Lepton Flavor

The lepton flavor violating process has been previously studied in a model of electroweak-scale right-handed neutrinos. We have calculated the decay amplitude in unitarity gauge [1]. In this paper, we recalculate the amplitude in gauge but in small neutrino mass limit. The final result which the cancellation of the dependence in is different from the obtained amplitude and the technical points in the previous work.

scholarly journals Disentangling QCD and new physics in D → πℓ+ℓ−

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Aoife Bharucha ◽  
Diogo Boito ◽  
Cédric Méaux
Keyword(s):  
Standard Model ◽  
Branching Ratio ◽  
Branching Ratios ◽  
New Physics ◽  
Operator Product ◽  
Beyond The Standard Model ◽  
Spectral Functions ◽  
The Standard Model ◽  
Model Independent ◽  
Weak Annihilation

Abstract In this paper we consider the decay D+ → π+ℓ+ℓ−, addressing in particular the resonance contributions as well as the relatively large contributions from the weak annihilation diagrams. For the weak annihilation diagrams we include known results from QCD factorisation at low q2 and at high q2, adapting the existing calculation for B decays in the Operator Product Expansion. The hadronic resonance contributions are obtained through a dispersion relation, modelling the spectral functions as towers of Regge-like resonances in each channel, as suggested by Shifman, imposing the partonic behaviour in the deep Euclidean. The parameters of the model are extracted using e+e− → (hadrons) and τ → (hadrons) + ντ data as well as the branching ratios for the resonant decays D+ → π+R(R → ℓ+ℓ−), with R = ρ, ω, and ϕ. We perform a thorough error analysis, and present our results for the Standard Model differential branching ratio as a function of q2. Focusing then on the observables FH and AFB, we consider the sensitivity of this channel to effects of physics beyond the Standard Model, both in a model independent way and for the case of leptoquarks.

scholarly journals SUSY breaking constraints on modular flavor S3 invariant SU(5) GUT model

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Xiaokang Du ◽  
Fei Wang
Keyword(s):  
Susy Breaking ◽  
Flavor Symmetry ◽  
Modular Invariance ◽  
Lepton Flavor ◽  
Flavor Structure ◽  
Flavor Mixing ◽  
Breaking Mechanism ◽  
Gut Scale ◽  
Additional Constraints ◽  
Rule Out

Abstract Modular flavor symmetry can be used to explain the quark and lepton flavor structures. The SUSY partners of quarks and leptons, which share the same superpotential with the quarks and leptons, will also be constrained by the modular flavor structure and show a different flavor(mixing) pattern at the GUT scale. So, in realistic modular flavor models with SUSY completion, constraints from the collider and DM constraints can also be used to constrain the possible values of the modulus parameter. In the first part of this work, we discuss the possibility that the S3 modular symmetry can be preserved by the fixed points of T2/ZN orbifold, especially from T2/Z2. To illustrate the additional constraints from collider etc on modular flavor symmetry models, we take the simplest UV SUSY-completion S3 modular invariance SU(5) GUT model as an example with generalized gravity mediation SUSY breaking mechanism. We find that such constraints can indeed be useful to rule out a large portion of the modulus parameters. Our numerical results show that the UV-completed model can account for both the SM (plus neutrino) flavor structure and the collider, DM constraints. Such discussions can also be applied straightforwardly to other modular flavor symmetry models, such as A4 or S4 models.

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.

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