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Naturalness in D-brane inspired models

  • Ron De Benedetti
  • Tianjun Li
  • James A. MaxinEmail author
  • Dimitri V. Nanopoulos
Open Access
Regular Article - Theoretical Physics
  • 14 Downloads

Abstract

We examine the naturalness of the D-brane inspired model constructed in flipped SU(5) supplemented with vector-like particles at the TeV scale, dubbed flippons. We find the model can produce a mainly Higgsino-like lightest supersymmetric particle (LSP) and small light stops, as favored by naturalness. In fact, a large trilinear scalar At term at the electroweak (EW) scale creates a large mass splitting between the top squarks, driving the light stop to near degeneracy with an LSP that is almost all Higgsino, with \( \Delta M\left({\tilde{t}}_1,{\tilde{\chi}}_1^0\right) \)< 5GeV, evading the LHC constraint on \( {\tilde{t}}_1\to c{\tilde{\chi}}_1^0 \) thus far. Given the smallness of the light stop, generating a 125 GeV light Higgs boson mass is aided by one-loop contributions from the Yukawa couplings between the flippons and Higgs fields. The resulting parameter space satisfying naturalness is rather constrained, thus we assess its viability by means of comparison to the LHC constraint on soft charm jets and direction detection limits on spin-independent cross-sections. Finally, we compute the level of electroweak fine-tuning and uncover a region with ΔEW< 30, i.e., fine-tuning better than 3%, regarded as low electroweak fine-tuning. Given the small light stop, the electroweak fine-tuning from only the top squarks is of \( \mathcal{O} \)(1), indicating no fine-tuning from neither the light stop \( {\tilde{t}}_1 \) nor the heavy stop \( {\tilde{t}}_2 \).

Keywords

Supersymmetry Phenomenology Strings and branes phenomenology 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2019

Authors and Affiliations

  1. 1.Department of Chemistry and PhysicsLouisiana State UniversityShreveportU.S.A.
  2. 2.CAS Key Laboratory of Theoretical Physics, Institute of Theoretical PhysicsChinese Academy of SciencesBeijingP.R. China
  3. 3.School of Physical SciencesUniversity of Chinese Academy of SciencesBeijingP.R. China
  4. 4.George P. and Cynthia W. Mitchell Institute for Fundamental Physics and AstronomyTexas A&M UniversityCollege StationU.S.A.
  5. 5.Astroparticle Physics GroupHouston Advanced Research Center (HARC)WoodlandsU.S.A.
  6. 6.Academy of Athens, Division of Natural SciencesAthensGreece

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