Higgs boson mixes with an SU(2) septet representation

Junji Hisano and Koji Tsumura
Phys. Rev. D 87, 053004 – Published 12 March 2013

Abstract

We study the possibility of the Higgs boson, which consists of an SU(2) doublet and a septet. The vacuum expectation value of a septet with hypercharge Y=2 is known to preserve the electroweak rho parameter unity at the tree level. Therefore, the septet can give a significant contribution to the electroweak symmetry breaking. Because of the mixing with the septet, the gauge coupling of the standard-model-like Higgs boson is larger than that in the standard model. We show the sizable vacuum expectation value of the Higgs septet can be allowed under the constraint from the electroweak precision data. The signal strengths of the Higgs boson for the diphoton and a pair of weak gauge boson decay channels at the LHC are enhanced, while those for the fermionic decay modes are suppressed. The mass of additional neutral Higgs boson is also bounded by the current LHC data for the standard model Higgs boson. We discuss the phenomenology of the multiply charged Higgs bosons, which come from the septet.

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  • Received 28 January 2013

DOI:https://doi.org/10.1103/PhysRevD.87.053004

© 2013 American Physical Society

Authors & Affiliations

Junji Hisano1,2,* and Koji Tsumura1,†

  • 1Department of Physics, Nagoya University, Nagoya 464-8602, Japan
  • 2IPMU, TODIAS, University of Tokyo, Kashiwa 277-8568, Japan

  • *hisano@eken.phys.nagoya-u.ac.jp
  • ko2@eken.phys.nagoya-u.ac.jp

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Issue

Vol. 87, Iss. 5 — 1 March 2013

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