Stop on top: SUSY parameter regions and fine-tuning constraints

Durmuş Ali Demir and Cem Salih Ün
Phys. Rev. D 90, 095015 – Published 17 November 2014

Abstract

We analyze minimal supersymmetric models in order to determine in what parameter regions with what amount of fine-tuning they are capable of accommodating the LHC-allowed top-stop degeneracy window. The stops must be light enough to enable Higgs naturalness yet heavy enough to induce a 125 GeV Higgs boson mass. These two constraints imply a large mass splitting. By an elaborate scan of the parameter space, we show that the stop-on-top scenario requires at least ΔCMSSMO(104) fine-tuning in the constrained minimal supersymmetric Standard Model (CMSSM). By relaxing the CMSSM parameter space with nonuniversal Higgs masses, we find that ΔNUHM1O(104). The CMSSM with a gravitino lightest supersymmetric particle works slightly better than the nonuniversal Higgs mass model. Compared to all these, the CMSSM with μ<0 and nonuniversal gauginos yields a much smaller fine-tuning Δμ,gO(100). Our results show that the gaugino sector can pave the road toward a more natural stop-on-top scenario.

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  • Received 14 July 2014

DOI:https://doi.org/10.1103/PhysRevD.90.095015

© 2014 American Physical Society

Authors & Affiliations

Durmuş Ali Demir1,* and Cem Salih Ün2,†

  • 1Department of Physics, İzmir Institute of Technology, IZTECH, TR35430 İzmir, Turkey
  • 2Department of Physics, Uludağ University, TR16059 Bursa, Turkey

  • *demir@physics.iztech.edu.tr
  • cemsalihun@uludag.edu.tr

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Issue

Vol. 90, Iss. 9 — 1 November 2014

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