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Dark Matter and enhanced h → γγ rate from vector-like Leptons

Journal of High Energy Physics volume 2012, Article number: 64 (2012) Cite this article

Abstract

In this paper, we study an extension of the standard model with a vector-like generation of leptons. This model provides a viable dark matter candidate and a possibility to enhance the Higgs decay rate into a pair of photons. We evaluate constraints from electroweak precision tests and from vacuum stability, and find that the latter provide an upper limit on the lepton Yukawa couplings. A large enhancement of the Higgs di-photon rate can therefore only be obtained when the mass of the lightest charged lepton is close to the LEP limit. The relic density constraint suggests a co-annihilation scenario with a small mass difference between the lightest charged and neutral leptons, which also weakens the LEP limit on the lightest charged lepton mass and allows for larger Higgs di-photon decay rates. Cross sections for direct detection of the dark matter candidate are calculated, and prospects for detecting the new particles at the LHC are discussed briefly.

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Authors and Affiliations

  1. Enrico Fermi Institute, University of Chicago, Chicago, IL, 60637, U.S.A

    Aniket Joglekar & Carlos E. M. Wagner

  2. HEP Division, Argonne National Laboratory, 9700 Cass Ave, Argonne, IL, 60439, U.S.A

    Pedro Schwaller & Carlos E. M. Wagner

  3. Physics Department, University of Illinois at Chicago, Chicago, IL, 60607, U.S.A

    Pedro Schwaller

  4. Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL, 60637, U.S.A

    Carlos E. M. Wagner

Authors
  1. Aniket Joglekar
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  2. Pedro Schwaller
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  3. Carlos E. M. Wagner
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Correspondence to Pedro Schwaller.

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ArXiv ePrint: 1207.4235

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Joglekar, A., Schwaller, P. & Wagner, C.E.M. Dark Matter and enhanced h → γγ rate from vector-like Leptons. J. High Energ. Phys. 2012, 64 (2012). https://doi.org/10.1007/JHEP12(2012)064

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  • DOI: https://doi.org/10.1007/JHEP12(2012)064

Keywords

  • Higgs Physics
  • Beyond Standard Model
  • Cosmology of Theories beyond the SM