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Dirac triplet extension of the MSSM

C. Alvarado1,*, A. Delgado1,2,†, A. Martin1,‡, and B. Ostdiek1,§

  • 1Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, Indiana 46556, USA
  • 2Theory Division, Physics Department, CERN, CH-1211 Geneva 23, Switzerland

  • *calvara1@nd.edu
  • †adelgad2@nd.edu
  • ‡amarti41@nd.edu
  • §bostdiek@nd.edu
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Phys. Rev. D 92, 035009 – Published 13 August, 2015

DOI: https://doi.org/10.1103/PhysRevD.92.035009

Abstract

In this paper we explore extensions of the minimal supersymmetric standard model involving two SU(2)L triplet chiral superfields that share a superpotential Dirac mass, only one of which couples to the Higgs fields. This choice is motivated by recent work using two singlet superfields with the same superpotential requirements. We find that, as in the singlet case, the Higgs mass in the triplet extension can easily be raised to 125 GeV without introducing large fine-tuning. For triplets that carry hypercharge, the regions of least fine-tuning are characterized by small contributions to the T parameter, and light stop squarks, mt˜1∼300−450  GeV; the latter is a result of the tanβ dependence of the triplet contribution to the Higgs mass. Despite such light stop masses, these models are viable provided the stop-electroweakino spectrum is sufficiently compressed.

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Phys. Rev. D 92, 035009– Published 13 August, 2015
  • Received 7 May 2015
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