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Fourth lepton family is natural in technicolor

Mads T. Frandsen1,2,*, Isabella Masina3,1,†, and Francesco Sannino1,‡

  • 1CP3 - Origins, IFK and IMADA, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark§
  • 2Rudolf Peierls Centre for Theoretical Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP, United Kingdom
  • 3Dipartimento di Fisica dell’Università degli Studi di Ferrara and INFN Sezione di Ferrara, Via Saragat 1, I-44100 Ferrara, Italy

  • *toudal@ifk.sdu.dk
  • †masina@fe.infn.it
  • ‡sannino@ifk.sdu.dk
  • §Centre of Excellence for Particle Physics Phenomenology dedicated to the understanding of the Origins of Mass in the Universe. This is the new affiliation from 1 September 2009.
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Phys. Rev. D 81, 035010 – Published 11 February, 2010

DOI: https://doi.org/10.1103/PhysRevD.81.035010

Abstract

Imagine discovering 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 a 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.

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Phys. Rev. D 81, 035010– Published 11 February, 2010
  • Received 16 July 2009

© 2010 American Physical Society

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