Quasi Yukawa Unification and Fine-Tuning in U(1) Extended SSM

Abstract

We consider the low scale implications in the U(1)' extended MSSM (UMSSM). We restrict the parameter space such that the lightest supersymmetric particle (LSP) is always the lightest neutralino. In addition, we impose quasi Yukawa unification (QYU) at the grand unification scale (M_GUT). QYU strictly requires the ratios among the yukawa couplings as y_t/y_b ~ 1.2, y_tau/y_b ~ 1.4, and y_t/y_tau ~ 0.8. We find that the need of fine-tuning over the fundamental parameter space of QYU is in the acceptable range (Delta_EW <= 10^3), even if the universal boundary conditions are imposed at M_ GUT, in contrast to CMSSM and NUHM. UMSSM with the universal boundary conditions yields heavy stops (m_{stop} >~ 2.5 TeV), gluinos (m_gluino >~ 2 TeV), and squarks from the first two families (m_squarks >~ 4 TeV). Similarly the stau mass is bounded from below at about 1.5 TeV. Despite this heavy spectrum, we find Delta_EW >~ 300, which is much lower than that needed for the minimal supersymmetric models. In addition, UMSSM yield relatively small mu-term, and the LSP neutralio is mostly form by the Higgsinos of mass >~ 700 GeV. We obtain also bino-like dark matter (DM) of mass about 400 GeV. Wino is usually found to be heavier than Higgsinos and binos, but there is a small region where mu ~ M_1 ~ M_2 ~ 1 TeV. We also identify chargino-neutralino coannihilation channel and A-resonance solutions which reduce the relic abundance of LSP neutralino down to the ranges compatible with the current WMAP measurements.

22 pages, 7 figures

References in corpus (37)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• micrOMEGAs2.0: a program to calculate the relic density of dark matter in a generic model
• micrOMEGAs4.1: two dark matter candidates
• Automatic Calculation of supersymmetric Renormalization Group Equations and Self Energies
• Supersymmetry, Naturalness, and Signatures at the LHC
• Search for neutral MSSM Higgs bosons decaying to a pair of tau leptons in pp collisions
• Results on the Spin-Dependent Scattering of Weakly Interacting Massive Particles on Nucleons from the Run 3 Data of the LUX Experiment
• Dark matter allowed scenarios for Yukawa-unified SO(10) SUSY GUTs
• Relaxed fine-tuning in models with non-universal gaugino masses
• New GUT predictions for quark and lepton mass ratios confronted with phenomenology
• Quark and lepton masses at the GUT scale including SUSY threshold corrections
• SUSY GUTs with Yukawa unification: a go/no-go study using FCNC processes
• Constraining the MSSM with universal gaugino masses and implication for searches at the LHC
• Minimal E_6 Supersymmetric Standard Model
• Yukawa Unification and Neutralino Dark Matter in SU(4)_c \times SU(2)_L \times SU(2)_R
• Naturalness of the Non-Universal MSSM in the light of the recent Higgs results
• Is "just-so" Higgs splitting needed for t-b-τYukawa unified SUSY GUTs?
• A new, direct link between the baryon asymmetry and neutrino masses
• Amelioration of Little Hierarchy Problem in SU(4)_c x SU(2)_L x SU(2)_R
• Mono-jet, -photon and -Z Signals of a Supersymmetric (B-L) model at the Large Hadron Collider
• Yukawa unification in SUSY SO(10) in light of the LHC Higgs data
• Mass Spectrum and Higgs Profile in BLSSM
• Stop on Top: SUSY Parameter Regions, Fine-Tuning Constraints
• Quark and lepton masses and mixing in SO(10) with a GUT-scale vector matter
• Constraining Natural SUSY via the Higgs Coupling and the Muon Anomalous Magnetic Moment Measurements
• Radiative Fermion Mass Hierarchy in a Non-supersymmetric Unified Theory
• The Super-Natural Supersymmetry and Its Classic Example: M-Theory Inspired NMSSM
• Discovery and Identification of Extra Neutral Gauge Bosons at the LHC
• Improving naturalness in Gauge Mediation with non-unified messenger sectors
• Yukawa Unification and Sparticle Spectroscopy in Gauge Mediation Models
• Light Neutralino Dark Matter in $U(1{)}^{\prime }$ models
• Masses of Third Family Vector-like Quarks and Leptons in Yukawa-Unified $E_6$
• Flavour structure of supersymmetric SO(10) GUTs with extended matter sector
• A Predictive Yukawa Unified SO(10) Model: Higgs and Sparticle Masses
• A Minimal Supersymmetric ${\mathrm{E}}_6$ Unified Theory

Cited by in corpus (10)

• Electron and muon magnetic moments and implications for dark matter and model characterisation in non-universal $U(1{)}^{\prime }$ supersymmetric models
• Muon g-2 in an Alternative Quasi-Yukawa Unification with Low Fine-Tuned Inverse SeeSaw Mechanism
• $E_6$ Motivated UMSSM Confronts Experimental Data
• Charged Higgs in MSSM and Beyond
• Least Fine-Tuned U(1) Extended SSM
• Masses of Third Family Vector-like Quarks and Leptons in Yukawa-Unified $E_6$
• Dark matter and Collider signals in supersymmetric $U(1{)}^{\prime }$ models with non-universal $Z^{\prime }$ couplings
• Low Fine-Tuning with Heavy Higgsinos in Yukawa Unified SUSY GUTs
• Model Characterization and Dark Matter in the Secluded $U(1{)}^{\prime }$ Model
• Vectorlike Particles, $Z^{\prime }$ and Yukawa Unification in F-theory inspired $E_6$