Nonuniversal gaugino masses from nonsinglet F -terms in nonminimal unified models

We investigate supersymmetric SO(10) GUT model with µ < 0. The requirements of top-bottom-tau Yukawa unification, correct radiative electroweak symmetry breaking and agreement with the present experimental data may be met when the soft masses of scalars and gauginos are non-universal. We show how appropriate nonuniversalities can easily be obtained in the SO(10) GUT broken to the Standard Model. We discuss how values of BR(b → sγ) and (g − 2) µ simultaneously in a good agreement with the experimental data can be achieved in SO(10) model with µ < 0. In the region of the parameter space preferred by our analysis there are two main mechanisms leading to the LSP relic abundance consistent with the WMAP results. One is the co-annihilation with the stau and the second is the resonant annihilation via exchange of the Z boson or the light Higgs scalar. A very interesting feature of SO(10) models with negative µ is that they predict relatively light sparticle spectra. Even the heaviest superpartners may easily have masses below 1.5 TeV in contrast to multi-TeV particles typical for models with positive µ.

Section: So(10) Yukawa Unification With Negative µmentioning

confidence: 93%

Section: Jhep08(2011)147mentioning

confidence: 99%

Yukawa unification in SO(10) with light sparticle spectrum

Badziak

Olechowski

Pokorski

2011

“…In addition, when µ ≪ M 1,2 , these processes are largely insensitive to other SUSY parameters but higgsino mass µ. Therefore, we do not consider the production of stops and gluino in this paper, which contribute to the fine-tuning in more complicated and model-dependent way [19][20][21][22]. The current constraints on the mass limits of stop and gluino in natural SUSY have been discussed in [28][29][30][31][32][33].…”

Section: Calculations and Discussionmentioning

confidence: 99%

“…(1.1), µ and m Hu must be of the order of ∼ 100 − 200 GeV, which implies light higgsinos. At the same time, the electroweak gaugino mass parameters M 1,2 are preferred to be of the similar order as the heavy gluino mass parameter M 3 and large Higgs-stop trilinear coupling A t is JHEP02(2014)049 needed [19][20][21][22]. Hence, generically we have µ ≪ M 1,2 and the mass splittings between the lightest chargino and the lightest two neutralinos at leading order are determined by [27] …”

Section: Introductionmentioning

confidence: 99%

Probing light higgsinos in natural SUSY from monojet signals at the LHC

Han

Kobakhidze

Liu

et al. 2014

127

123

We investigate a strategy to search for light, nearly degenerate higgsinos within the natural MSSM at the LHC. We demonstrate that the higgsino mass range µ in 100 − 160 GeV, which is preferred by the naturalness, can be probed at 3σ significance through the monojet search at 14 TeV HL-LHC with 3000 fb −1 luminosity. The proposed method can also probe certain region in the parameter space for the lightest neutralino with a high higgsino purity, that cannot be reached by planned direct detection experiments at XENON-1T(2017).

“…This happens because µ 2 is related to m 2 hu and m 2 h d through the electroweak symmetry breaking condition eq. GUT models (denoted by circles, squares and diamonds respectively) considered in [57]. GUT models with F terms in 75 or 200 of SU (5), in 210 or 770 of SO (10) and in the corresponding representations of "flipped SO(10)" embedded in E 6 predict gaugino mass ratios in the intermediate and low fine tuning region.…”

Section: The Gaugino Focus Point -Analytic Discussionmentioning

confidence: 99%

Non-universal gaugino masses and fine tuning implications for SUSY searches in the MSSM and the GNMSSM

Kaminska

Ross

Schmidt-Hoberg

2013

For the case of the MSSM and the most general form of the NMSSM (GN-MSSM) we determine the reduction in the fine tuning that follows from allowing gaugino masses to be non-degenerate at the unification scale, taking account of the LHC8 bounds on SUSY masses, the Higgs mass bound, gauge coupling unification and the requirement of an acceptable dark matter density. We show that low-fine tuned points fall in the region of gaugino mass ratios predicted by specific unified and string models. For the case of the MSSM the minimum fine tuning is still large, approximately 1:60 allowing for a 3 GeV uncertainty in the Higgs mass (1:500 for the central value), but for the GNMSSM it is below 1:20. We find that the spectrum of SUSY states corresponding to the low-fine tuned points in the GNMSSM is often compressed, weakening the LHC bounds on coloured states. The prospect for testing the remaining low-fine-tuned regions at LHC14 is discussed.