Article
Yukawa coupling unification in SO(10) with positive \mu\ and a heavier gluino
Physical review D: Particles and fields 06/2012; 86(3). DOI:10.1103/PhysRevD.86.035019
Source: arXiv
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Article: Yukawaunified natural supersymmetry
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ABSTRACT: Previous work on tb\tau Yukawaunified supersymmetry, as expected from SUSY GUT theories based on the gauge group SO(10), tended to have exceedingly large electroweak finetuning (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 m_h\sim125 GeV. As Yukawa unification requires large tan\beta\sim50, while EWFT requires rather light third generation squarks and low \mu\sim100250 GeV, Bphysics constraints from BR(B\to X_s\gamma) and BR(B_s\to \mu+\mu) can be severe. We are able to find models with EWFT \Delta\lesssim 50100 (better than 12% EWFT) and with Yukawa unification as low as R_yuk\sim1.3 (30% unification) if Bphysics constraints are imposed. This may be improved to R_yuk\sim1.2 if additional small flavor violating terms conspire to improve accord with Bconstraints. We present several Yukawaunified natural SUSY (YUNS) benchmark points. LHC searches will be able to access gluinos in the lower 12 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\to \mu+\mu decay might allow a determination of tan\beta\sim50 as predicted by YUNS models. Finally, the predicted light higgsinos should be accessible to a linear e+e collider with \sqrt{s}\sim0.5 TeV.Journal of High Energy Physics 08/2012; 2012(12). · 5.62 Impact Factor  [show abstract] [hide abstract]
ABSTRACT: It is shown that substantially enhanced Higgs to diphoton rate induced by light staus with large leftright mixing in MSSM requires at the GUT scale nonuniversal gaugino masses with bino and/or wino lighter than gluino. The possibility of such enhancement is investigated in MSSM models with arbitrary gaugino masses at the GUT scale with additional restriction of topbottomtau Yukawa unification, as predicted by minimal SO(10) GUTs. Many patterns of gaugino masses leading to enhanced Higgs to diphoton rate and the Yukawa unification are identified. Some of these patterns can be accommodated in a wellmotivated scenarios such as mirage mediation or SUSY breaking Fterms being a nonsinglet of SO(10). Phenomenological implications of a scenario with nonuniversal gaugino masses generated by a mixture of the singlet Fterm and the Fterm in a 24dimensional representation of SU(5) $\subset$ SO(10) are studied in detail. Possible nonuniversalities of other soft terms generated by such Fterms are discussed. The enhancement of Higgs to diphoton rate up to 30% can be obtained in agreement with all phenomenological constraints, including vacuum metastability bounds. The lightest sbottom and pseudoscalar Higgs are within easy reach of the 14 TeV LHC. The LSP can be either binolike or winolike. The thermal relic abundance in the former case may be in agreement with the cosmological data thanks to efficient stau coannihilation.Journal of High Energy Physics 07/2013; 2013(10). · 5.62 Impact Factor  [show abstract] [hide abstract]
ABSTRACT: We revisit a class of supersymmetric SO(10) models with tbτ Yukawa coupling unification condition, with emphasis on the prediction of the Higgs mass. We discuss qualitative features in this model that lead to a Higgs mass prediction close to 125 GeV. We show this with two distinct computing packages, Isajet and SuSpect, and also show that they yield similar global features in the parameter space of this model. We find that tbτ Yukawa coupling unification prefers values of the CPodd Higgs mass m A to be around 600–800 GeV, with all colored sparticle masses above 3 TeV. We also briefly discuss prospects for testing this scenario with the ongoing and planned direct dark matter detection experiments. In this class of models with tbτ Yukawa unification, the neutralino dark matter particle is heavy ( $ {m_{{\widetilde{\chi}_1^0}}} $ ≳ 400 GeV), which coannihilates with a stau to yield 1 the correct relic abundance.Journal of High Energy Physics 07/2013; 2013(7). · 5.62 Impact Factor
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