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Journal of High Energy Physics

, 2012:66

First Online: 12 December 2012Received: 27 August 2012Revised: 20 November 2012Accepted: 26 November 2012 Abstract

Previous work on t − b − τ Yukawa-unified supersymmetry, as expected from SUSY GUT theories based on the gauge group SO10, tended to have exceedingly large electroweak fine-tuning EWFT. Here, we examine supersymmetric models where we simultaneously require low EWFT -natural SUSY- and a high degree of Yukawa coupling unification, along with a light Higgs scalar with mh ~ 125 GeV. As Yukawa unification requires large tan β ~ 50, while EWFT requires rather light third generation squarks and low μ ≈ 100 − 250 GeV, B-physics constraints from BRB → Xsγ and BRBs → μμ can be severe. We are able to find models with EWFT Δ ≲ 50 − 100 better than 1–2% EWFT and with Yukawa unification as low as Ryuk ~ 1.2 20% unification. The unification is lessened to Ryuk ~ 1.3 when B-physics constraints are imposed. We present several Yukawa-unified natural SUSY YUNS benchmark points. LHC searches will be able to access gluinos in the lower 1 – 2 TeV portion of their predicted mass range although much of YUNS parameter space may lie beyond LHC14 reach. If heavy Higgs bosons can be accessed at a high rate, then the rare H, A → μμ decay might allow a determination of tan β ~ 50 as predicted by YUNS models. Finally, the predicted light higgsinos should be accessible to a linear ee collider with \ \sqrt{s}\sim 0.5 \ TeV.

KeywordsSupersymmetry Phenomenology ArXiv ePrint: 1208.3039

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Author: Howard Baer - Sabine Kraml - Suchita Kulkarni

Source: https://link.springer.com/







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