scholarly journals Freezing In with lepton flavored fermions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Giancarlo D'Ambrosio ◽  
Shiuli Chatterjee ◽  
Ranjan Laha ◽  
Sudhir Kumar Vempati
Keyword(s):  
Standard Model ◽  
Direct Detection ◽  
Lepton Number ◽  
Minimal Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Quantum Numbers ◽  
The Standard Model ◽  
Lepton Number Violating

Dark, chiral fermions carrying lepton flavor quantum numbers are natural candidates for freeze-in. Small couplings with the Standard Model fermions of the order of lepton Yukawas are `automatic' in the limit of Minimal Flavor Violation. In the absence of total lepton number violating interactions, particles with certain representations under the flavor group remain absolutely stable. For masses in the GeV-TeV range, the simplest model with three flavors, leads to signals at future direct detection experiments like DARWIN. Interestingly, freeze-in with a smaller flavor group such as SU(2) is already being probed by XENON1T.

scholarly journals Lepton flavor violation in the μνSSM with slepton flavor mixing

2014 ◽  
Vol 29 (23) ◽  
pp. 1450123 ◽  
Author(s):  
Hai-Bin Zhang ◽  
Tai-Fu Feng ◽  
Shu-Min Zhao ◽  
Fei Sun
Keyword(s):  
Standard Model ◽  
Lepton Number ◽  
Lepton Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
The Standard Model ◽  
Flavor Mixing

The μνSSM, one of supersymmetric extensions of the Standard Model, introduces three right-handed neutrino superfields to solve the μ problem and violates lepton number. Within framework of the μνSSM, we investigate the lepton flavor violating (LFV) processes [Formula: see text] with slepton flavor mixing. Simultaneously, we consider the LFV processes [Formula: see text] and muon conversion to electron in nuclei.

scholarly journals Searching for charged lepton flavor violation at ep colliders

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Stefan Antusch ◽  
A. Hammad ◽  
Ahmed Rashed
Keyword(s):  
Standard Model ◽  
Charged Lepton ◽  
Neutral Current ◽  
Effective Theory ◽  
Theory Approach ◽  
Lepton Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
The Standard Model ◽  
Order Of Magnitude

Abstract We investigate the sensitivity of electron-proton (ep) colliders for charged lepton flavor violation (cLFV) in an effective theory approach, considering a general effective Lagrangian for the conversion of an electron into a muon or a tau via the effective coupling to a neutral gauge boson or a neutral scalar field. For the photon, the Z boson and the Higgs particle of the Standard Model, we present the sensitivities of the LHeC for the coefficients of the effective operators, calculated from an analysis at the reconstructed level. As an example model where such flavor changing neutral current (FCNC) operators are generated at loop level, we consider the extension of the Standard Model by sterile neutrinos. We show that the LHeC could already probe the LFV conversion of an electron into a muon beyond the current experimental bounds, and could reach more than an order of magnitude higher sensitivity than the present limits for LFV conversion of an electron into a tau. We discuss that the high sensitivities are possible because the converted charged lepton is dominantly emitted in the backward direction, enabling an efficient separation of the signal from the background.

Supersymmetric Lepton Flavor Violation, the Muon Anomalous Magnetic Moment, and e- e- Colliders

2003 ◽  
Vol 18 (16) ◽  
pp. 2769-2778
Author(s):  
Graham D. Kribs
Keyword(s):  
Standard Model ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
International Workshop ◽  
Lepton Flavor Violation ◽  
Muon Anomalous Magnetic Moment ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Central Value ◽  
The Standard Model

I explain the theoretical connection between lepton flavor violation and muon g - 2 in supersymmetry1. Given any central value deviation of muon g - 2 from the standard model that is assumed to be due to weak scale supersymmetry, I show that stringent bounds on lepton flavor violating scalar masses can be extracted. These bounds are essentially independent of supersymmetric parameter space. I then briefly compare this indirect handle on supersymmetric lepton flavor violation with direct observation at a future lepton collider operating in the e- e- mode. This is a summary of a talk given at e- e-01: 4th International Workshop on Electron-Electron Interactions at TeV Energies.

scholarly journals THEORETICAL OVERVIEW ON TAU PHYSICS

2006 ◽  
Vol 21 (27) ◽  
pp. 5652-5659 ◽  
Author(s):  
ANTONIO PICH
Keyword(s):  
Standard Model ◽  
Present Status ◽  
Model Structure ◽  
Lepton Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Lepton Universality ◽  
The Standard Model ◽  
Theoretical Overview

Precise measurements of the τ lepton properties provide stringent tests of the Standard Model structure and accurate determinations of its parameters. We overview the present status of a few selected topics: lepton universality, QCD tests and the determination of αs, msand |Vus| from hadronic τ decays, and lepton flavor violation phenomena.

scholarly journals Lepton Flavor Violation beyond the MSSM

2015 ◽  
Vol 2015 ◽  
pp. 1-22 ◽  
Author(s):  
A. Vicente
Keyword(s):  
Standard Model ◽  
Parity Violation ◽  
New Physics ◽  
Lepton Flavor Violation ◽  
Lepton Sector ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
The Standard Model ◽  
Supersymmetric Models ◽  
Characteristic Features

Most extensions of the Standard Model lepton sector predict large lepton flavor violating rates. Given the promising experimental perspectives for lepton flavor violation in the next few years, this generic expectation might offer a powerful indirect probe to look for new physics. In this review we will cover several aspects of lepton flavor violation in supersymmetric models beyond the Minimal Supersymmetric Standard Model. In particular, we will concentrate on three different scenarios: high-scale and low-scale seesaw models as well as models withR-parity violation. We will see that in some cases the LFV phenomenology can have characteristic features for specific scenarios, implying that dedicated studies must be performed in order to correctly understand the phenomenology in nonminimal supersymmetric models.

scholarly journals The LFV decays Bd,s0 → eμ(eτ,μτ) with one neutral singlet scalar

2018 ◽  
Vol 33 (36) ◽  
pp. 1850214
Author(s):  
Ke-Sheng Sun ◽  
Xiu-Yi Yang
Keyword(s):  
Standard Model ◽  
Theoretical Prediction ◽  
Numerical Results ◽  
Minimal Extension ◽  
Lepton Flavor Violation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
The Standard Model

Taking account of the constraint from radiative two-body decays [Formula: see text], we investigate the lepton flavor violation decays [Formula: see text] in the framework of the minimal extension of the Standard Model with one neutral singlet scalar. The couplings [Formula: see text], [Formula: see text] and [Formula: see text] between the different generation leptons and scalar [Formula: see text] are constrained by the current bounds of [Formula: see text]. The numerical results show that the theoretical prediction of [Formula: see text] strongly depends on the couplings [Formula: see text] ([Formula: see text] or [Formula: see text]) between down-type quarks and new scalar. The contributions from couplings [Formula: see text], [Formula: see text] and [Formula: see text] between up-type quark and new scalar are less dominant.

MSSM PREDICTIONS ON LEPTON FLAVOR VIOLATION DECAYS OF VECTOR MESONS

2012 ◽  
Vol 27 (40) ◽  
pp. 1250230
Author(s):  
JING YANG ◽  
KE-SHENG SUN
Keyword(s):  
Standard Model ◽  
Higgs Mass ◽  
Branching Ratios ◽  
Heavy Flavor ◽  
Lepton Flavor Violation ◽  
Vector Mesons ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
The Standard Model ◽  
Near Future

In the minimal supersymmetric extension of the Standard Model (MSSM) the interactions between the SUSY particles and the Standard Model (SM) particles can contribute to the lepton flavor violation (LFV) decays of vector mesons at loop level. Taking the constraint on the lightest Higgs mass around 126 GeV, we study these decays by a scan over the parameter space which gives the predictions on μ-e conversion and τ→μγ satisfying the experimental bounds. The branching ratios of the vector mesons decays into eμ are strongly suppressed. However, the branching ratios of the heavy flavor mesons decays into τμ can reach the experimental sensitivity in near future. Therefore, the experimental signals of these decays may serve as a probe of the MSSM.

scholarly journals Gauge Boson Mixing in the 3-3-1 Models with Discrete Symmetries

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
P. V. Dong ◽  
V. T. N. Huyen ◽  
H. N. Long ◽  
H. V. Thuy
Keyword(s):  
Standard Model ◽  
Gauge Boson ◽  
Discrete Symmetries ◽  
Lepton Number ◽  
Neutrino Mixing ◽  
Gauge Bosons ◽  
Neutral Gauge Boson ◽  
Neutral Scalar ◽  
The Standard Model ◽  
Lepton Number Violating

The mixing among gauge bosons in the 3-3-1 models with the discrete symmetries is investigated. To get tribimaximal neutrino mixing, we have to introduce sextets containing neutral scalar components with lepton numberL=1,2. Assignation of VEVs to these fields leads to the mixing of the new gauge bosons and those in the standard model. The mixing in the charged gauge bosons leads to the lepton number violating interactions of theWboson. The same situation happens in the neutral gauge boson sector.

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