Yukawa quasi-unification with μ0 (original) (raw)
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Constrained Minimal Supersymmetric Standard Model with Generalized Yukawa Quasi-Unification
We analyze the constrained minimal supersymmetric standard model with mu>0 supplemented by a generalized `asymptotic' Yukawa coupling quasi-unification condition, which allows an acceptable b-quark mass. We impose constraints from the cold dark matter abundance in the universe, B physics, and the mass of the lightest neutral CP-even Higgs boson. We find that, in contrast to previous results obtained for a more restrictive Yukawa quasi-unification condition, the lightest neutralino can act as a cold dark matter candidate in a relatively wide parameter range. In this range, the lightest neutralino relic abundance is drastically reduced mainly by stau-antistau coannihilations and, thus, the upper bound on this abundance from cold dark matter considerations becomes compatible with the recent data on the branching ratio of B_s --> mu^+mu^-. Also, masses for the lightest neutral CP-even Higgs boson about (125-126) GeV, favored by LHC, can be easily accommodated. The mass of the lightest neutralino, though, comes out large (~1 TeV).
MSSM With Yukawa Quasi-Unification
Arxiv preprint hep-ph/0303094, 2003
We consider the constrained minimal supersymmetric standard model which emerges from one theory with a small deviation from Yukawa unification which is adequate for µ > 0. We show that this model possesses a wide and natural range of parameters which is consistent with the data on b → sγ, the muon anomalous magnetic moment, the cold dark matter abundance in the universe, and the Higgs boson masses.
Nuclear Physics B, 2002
We construct concrete supersymmetric grand unified theories based on the Pati-Salam gauge group SU (4) c × SU (2) L × SU (2) R which naturally lead to a moderate violation of 'asymptotic' Yukawa unification and thus can allow an acceptable b-quark mass even with universal boundary conditions. We consider the constrained minimal supersymmetric standard model which emerges from one of these theories with a deviation from Yukawa unification which is adequate for µ > 0. We show that this model possesses a wide and natural range of parameters which is consistent with the data on b → sγ, the muon anomalous magnetic moment, the cold dark matter abundance in the universe, and the Higgs boson masses. The lightest supersymmetric particle can be as light as about 107 GeV.
CMSSM with Yukawa quasi-unification
We present an updated analysis of the constrained minimal supersymmetric standard model with µ > 0 supplemented by an "asymptotic" Yukawa coupling quasi-unification condition, which allows an acceptable b-quark mass. Imposing constraints from the cold dark matter abundance in the universe, B physics, the muon anomalous magnetic moment, and the mass mh of the lightest neutral CP-even Higgs boson, we find that the lightest neutralino cannot act as a cold dark matter candidate. This is mainly because the upper bound on the lightest neutralino relic abundance from cold dark matter considerations, despite the fact that this abundance is drastically reduced by neutralino-stau coannihilations, is incompatible with the recent data on the branching ratio of B s → µ + µ − . Allowing for a different particle, such as the axino or the gravitino, to be the lightest supersymmetric particle and, thus, constitute the cold dark matter in the universe, we find that the predicted mh 's in our model favor the range (119 -126) GeV.
Cosmological Constraints in SUSY with Yukawa Unification
2001
The cosmological relic density of the lightest supersymmetric particle of the minimal supersymmetric standard model is calculated under the assumption of gauge and Yukawa coupling unification. We employ radiative electroweak breaking with universal boundary conditions from gravity-mediated supersymmetry breaking. Further constraints are imposed by the experimental bounds on the b-quark mass and the BR(b -> s gamma). We find that coannihilation of the lightest supersymmetric particle, which turns out to be an almost pure bino, with the next-to-lightest supersymmetric particle (the lightest stau) is crucial for reducing its relic density to an acceptable level.
CMSSM with Yukawa Quasi-Unification Revisited
The constrained minimal supersymmetric standard model with {\mu}>0 supplemented by an `asymptotic' Yukawa coupling quasi-unification condition, which allows an acceptable b-quark mass, is reinvestigated. Imposing updated constraints from the cold dark matter abundance in the universe, B physics, the muon anomalous magnetic moment, and the mass mh of the lightest neutral CP-even Higgs boson, we find that the allowed parameter space is quite limited but not unnaturally small with the cold dark matter abundance suppressed only via neutralino-stau coannihilations. The lightest neutralino with mass in the range (341-677) GeV is possibly detectable in the future direct cold dark matter searches via its spin-independent cross section with nucleon. In the allowed parameter space of the model, we obtain mh=(117-122.2) GeV.
Yukawa unification with light supersymmetric particles consistent with LHC constraints
Nuclear Physics B, 2019
We investigate supersymmetric models with left-right symmetry based on the group SU (4) c × SU (2) L × SU (2) R (4-2-2) with negative sign of bilinear Higgs potential parameter µ in the context of the latest experimental results. In the backdrop of experimental results from the Large Hadron Collider, we investigate the possibility of Yukawa unification in 4-2-2 and find out the same is still not ruled out. Furthermore, this scenario also provides a satisfactory dark matter candidate. The current experimental bounds on sparticle masses, mass bounds on Higgs particle, updated phenomenological constraints from the rare decays of B meson and the anomalous magnetic moment of muon with the requirement of a Yukawa unified theory having 10% or better third family Yukawa unification are utilized to bound the parametric space of these models.
Supersymmetric dark matter and Yukawa unification
Physical Review D, 2002
An analysis of supersymmetric dark matter under the Yukawa unification constraint is given. The analysis utilizes the recently discovered region of the parameter space of models with gaugino mass nonuniversalities where large negative supersymmetric corrections to the b quark mass appear to allow b − τ unification for a positive µ sign consistent with the b → s + γ and g µ − 2 constraints. In the present analysis we use the revised theoretical determination of a SM µ (a µ = (g µ −2)/2) in computing the difference a exp µ −a SM µ which takes account of a reevaluation of the light by light contribution which has a positive sign. The analysis shows that the region of the parameter space with nonuniversalities of the gaugino masses which allows for unification of Yukawa couplings also contains regions which allow satisfaction of the relic density constraint. Specifically we find that the lightest neutralino mass consistent with the relic density constraint, bτ unification for SU(5) and b − t − τ unification for SO(10) in addition to other constraints lies in the region below 80 GeV. An analysis of the maximum and the minimum neutralino-proton scalar cross section for the allowed parameter space including the effect of a new determination of the pion-nucleon sigma term is also given. It is found that the full parameter space for this class of models can be explored in the next generation of proposed dark matter detectors. 1 Recently supersymmetric dark matter has come under a great deal of scrutiny due to the fact that the neutralino-proton cross sections for a wide class of supersymmetric models fall within the range that is accessible to the current and planned dark matter experiments[1, 2, 3, 4, 5]. Thus some recent studies have included a variety of effects in the predictions of relic densities and of detection rates in the direct and in the indirect detection of dark matter[6]. These include the effects of nonuniversality of the scalar masses at the unification scale[7], effects of CP violation with EDM constraints[8], effects of coannihilation[9], the effects of the g µ −2 constraint, as well as the effect of variations of the WIMP velocity[10, 11, 12], and the effects of rotation of the galaxy[13] in the prediction of detection rates for the direct and the indirect detection of dark matter. In this work we focus on the effects of constraints of Yukawa unification on dark matter. This topic has largely not been addressed in the literature, except for the work of Ref.[14] which, however, does not take account of gaugino mass nonuniversalities which is an important element of the present work. We focus on models where Yukawa unification occurs for µ positive (we use the sign convention of Ref.[15]) consistent with the b → s + γ and the g µ − 2 constraint from Brookhaven. The outline of the rest of the paper is as follows: In
CMSSM With Generalized Yukawa Quasi-Unification: An Update
Proceedings of Proceedings of the Corfu Summer Institute 2014 — PoS(CORFU2014)
We analyze the parametric space of the constrained minimal supersymmetric standard model (CMSSM) with µ > 0 supplemented by a generalized asymptotic Yukawa coupling quasi-unification condition which yields acceptable masses for the fermions of the third family. We impose constraints from the cold dark matter abundance in the universe and its direct detection experiments, the B-physics, as well as the masses of the sparticles and the lightest neutral CP-even Higgs boson, m h. We identify two distinct allowed regions with M 1/2 > m 0 and m 0 ≫ M 1/2 classified in the hyperbolic branch of the radiative electroweak symmetry breaking. In the first region we obtain, approximately, 44 tan β 52, −3 A 0 /M 1/2 0.1, 122 m h /GeV 127, and mass of the lightest sparticle in the range (0.75 − 1.43) TeV. Such heavy lightest sparticle masses can become consistent with the cold dark matter requirement on the lightest sparticle relic density thanks to neutralino-stau coannihilations. In the latter region, fixing m h to its central value from the LHC, we find a wider allowed parameter space with milder electroweak-symmetry-breaking fine-tuning, 40 tan β 50, −11 A 0 /M 1/2 15 and mass of the lightest sparticle in the range (0.09 − 1.1) TeV. This sparticle is possibly detectable by the present cold dark matter direct search experiments.