Download presentation

Presentation is loading. Please wait.

1
4 th Generation Leptons in Minimal Walking Technicolor Theory Matti Heikinheimo University of Jyväskylä

2
Background: What is technicolor? In SM, electroweak symmetry is broken by the Higgs field Hierarchy problem: Solution: Break electroweak symmetry dynamically Technicolor = a new strongly interacting sector accounts for EWSB

3
Walking Technicolor To get SM fermion masses, we need another new interaction at some high scale This gives four-fermion vertices between SM fermions and techniquarks → Flavour changing neutral currents Need walking dynamics to suppress the FCNCs

4
Walking behaviour of the coupling constant as a function of momentum

5
Minimal Walking Technicolor Model Fundamental techniquarks: needed for walking → Too large contributions to the S parameter Adjoint techniquarks → Need only

6
New particles:,, in the adjoint representation of We have added three new weak doublets → the model suffers from Witten anomaly Cure the anomaly: add one more weak doublet → 4 th lepton generation,, Neutrino mass matrix allows the neutrino to have a general mass structure → Two Majorana neutrinos,

7
Phenomenology of the 4 th generation leptons The phenomenology of the 4 th lepton generation has been studied, but usually with 4 th QCD quark generation MWTC adds only the 4 th generation leptons but no QCD quarks We also allow the new neutrino to have a general mass structure

8
The Lagrangian: where, and mass matrix eigenvalues → Mass eigenstates, where Neutral current Charged current

17
Decay fractions of the Higgs boson in the standard model and in MWTC

Similar presentations

© 2019 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google