Fourth Lepton Family is Natural in Technicolor

Abstract

Imagine to discover a new fourth family of leptons at the Large Hadron Collider (LHC) but no signs of an associated fourth family of quarks. What would that imply? An intriguing possibility is that the new fermions needed to compensate for the new leptons gauge anomalies simultaneously address the big hierarchy problem of the Standard Model. A natural way to accomplish such a scenario is to have the Higgs itself be composite of these new fermions. This is the setup we are going to investigate in this paper using as a template Minimal Walking Technicolor. We analyze a general heavy neutrino mass structure with and without mixing with the Standard Model families. We also analyze the LHC potential to observe the fourth lepton family in tandem with the new composite Higgs dynamics. We finally introduce a model uniting the fourth lepton family and the technifermion sector at higher energies.

39 ReVTeX pages, 16 figures

References in corpus (23)

• Stable Massive Particles at Colliders
• Signatures for Majorana neutrinos at hadron colliders
• Decaying Dark Matter can explain the electron/positron excesses
• Dark Matter from new Technicolor Theories
• Ultra Minimal Technicolor and its Dark Matter TIMP
• Minimal Walking Technicolor: Set Up for Collider Physics
• Four Statements about the Fourth Generation
• Heavy neutrino signals at large hadron colliders
• Towards Working Technicolor: Effective Theories and Dark Matter
• Technicolor Walks at the LHC
• Search for Long-Lived Massive Charged Particles in 1.96 TeV $\bar{p}p}$ Collisions
• Dark Majorana Particles from the Minimal Walking Technicolor
• The WIMP of a Minimal Technicolor Theory
• Neutrino physics at large colliders
• Gauge Coupling Unification via A Novel Technicolor Model
• Constraining Walking and Custodial Technicolor
• Tau Physics: Theory Overview
• WW Scattering in Walking Technicolor
• Fourth Family Neutrinos and the Higgs Boson
• Natural fourth generation of leptons
• Pion masses in quasiconformal gauge field theories
• Like-sign dilepton signals from a leptophobic Z' boson
• Search for Invisibly Decaying Higgs Bosons with Large Decay Width Using the OPAL Detector at LEP

Cited by in corpus (25)

• Four Statements about the Fourth Generation
• The Physics Programme Of The MoEDAL Experiment At The LHC
• Higgs in Space!
• Discovering Technicolor
• The dark side of the Higgs boson
• Conformal Window of Gauge Theories with Four-Fermion Interactions and Ideal Walking
• iTIMP: isotriplet Technicolor Interacting Massive Particle as Dark Matter
• Mixed dark matter from technicolor
• Unnatural Origin of Fermion Masses for Technicolor
• Scalar Dark Matter and Standard Model with Four Generations
• Resizing the Conformal Window: A beta function Ansatz
• Flavor Dependence of the S-parameter
• Doubly Charged Lepton from an Exotic Doublet at the LHC
• Triplet with a doubly-charged lepton at the LHC
• Minimal Super Technicolor
• Four Generations: SUSY and SUSY Breaking
• A hybrid 4${}^{\text{th}}$ generation: Technicolor with top-seesaw
• Fourth Generation Majorana Neutrinos
• Naturality, unification and dark matter
• Supersymmetric Extension of Technicolor & Fermion Mass Generation
• Technicolor and Beyond: Unification in Theory Space
• Invisible Higgs and Dark Matter
• Composite Higgs to two Photons and Gluons
• Cosmic Ray Electron and Positron Excesses from a Fourth Generation Heavy Majorana Neutrino
• Bounds on fourth generation induced Lepton Flavour Violating double insertions in Supersymmetry