Focus points and naturalness in supersymmetry

Feng, Jonathan L.; Matchev, K.; Moroi, Takeo

doi:10.1103/physrevd.61.075005

Cited by 527 publications

(526 citation statements)

References 65 publications

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“…strip [116][117][118][119][120][121] hugging the electroweak symmetry breaking boundary where the neutralino is well-tempered [122]. 5 In this case we see both the 124 and 125 GeV Higgs mass contours and, as in the previous example, m H is compatible with experiment whenever the dark matter density falls within the allowed range.…”

Section: Jhep02(2016)071supporting

confidence: 66%

Scenarios for gluino coannihilation

Ellis

Evans

Luo

et al. 2016

J. High Energ. Phys.

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We study supersymmetric scenarios in which the gluino is the next-to-lightest supersymmetric particle (NLSP), with a mass sufficiently close to that of the lightest supersymmetric particle (LSP) that gluino coannihilation becomes important. One of these scenarios is the MSSM with soft supersymmetry-breaking squark and slepton masses that are universal at an input GUT renormalization scale, but with non-universal gaugino masses. The other scenario is an extension of the MSSM to include vector-like supermultiplets. In both scenarios, we identify the regions of parameter space where gluino coannihilation is important, and discuss their relations to other regions of parameter space where other mechanisms bring the dark matter density into the range allowed by cosmology. In the case of the non-universal MSSM scenario, we find that the allowed range of parameter space is constrained by the requirement of electroweak symmetry breaking, the avoidance of a charged LSP and the measured mass of the Higgs boson, in particular, as well as the appearance of other dark matter (co)annihilation processes. Nevertheless, LSP masses m χ 8 TeV with the correct dark matter density are quite possible. In the case of pure gravity mediation with additional vector-like supermultiplets, changes to the anomalymediated gluino mass and the threshold effects associated with these states can make the gluino almost degenerate with the LSP, and we find a similar upper bound.

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Section: Jhep02(2016)071supporting

confidence: 66%

Scenarios for gluino coannihilation

Ellis

Evans

Luo

et al. 2016

J. High Energ. Phys.

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“…Finally, the relic density can again be brought down into the WMAP range (17) at large m 0 (not shown in Fig. 2), in the 'focus-point' region close the boundary where electroweak symmetry breaking ceases to be possible and the lightest neutralino χ acquires a significant higgsino component [93].…”

Section: The Cmssmmentioning

confidence: 99%

Supersymmetric dark matter candidates

Ellis

Olive²

2010

Particle Dark Matter

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CERN-PH-TH/2010-004, UMN-TH-2831/10, FTPI-MINN-10/02After reviewing the theoretical, phenomenological and experimental motivations for supersymmetric extensions of the Standard Model, we recall that supersymmetric relics from the Big Bang are expected in models that conserve R parity. We then discuss possible supersymmetric dark matter candidates, focusing on the lightest neutralino and the gravitino. In the latter case, the next-to-lightest supersymmetric particle is expected to be long-lived, and possible candidates include spartners of the tau lepton, top quark and neutrino. We then discuss the roles of the renormalization-group equations and electroweak symmetry breaking in delimiting the supersymmetric parameter space. We discuss in particular the constrained minimal extension of the Standard Model (CMSSM), in which the supersymmetry-breaking parameters are assumed to be universal at the grand unification scale, presenting predictions from a frequentist analysis of its parameter space. We also discuss astrophysical and cosmological constraints on gravitino dark matter models, as well as the parameter space of minimal supergravity (mSUGRA) models in which there are extra relations between the trilinear and bilinear supersymmetry-breaking parameters, and between the gravitino and scalar masses. Finally, we discuss models with non-universal supersymmetry-breaking contributions to Higgs masses, and models in which the supersymmetry-breaking parameters are universal at some scale below that of grand unification. From 'Particle Dark Matter: Observations, Models and Searches' edited byGianfranco Bertone

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“…A most relevant analytic study concerning this issue is the well-known work by Feng et al [54], where they studied the focus point [35,54,55] region of the CMSSM . In the generic MSSM, the (1-loop) RG evolution of a shift in the initial values of m 2 Hu , m 2 8) where t ≡ ln Q, with Q the renormalization-scale, and y t is the top Yukawa coupling.…”

Section: Jhep06(2015)070mentioning

confidence: 99%

What is a natural SUSY scenario?

Casas

Moreno

Robles

et al. 2015

J. High Energ. Phys.

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The idea of "Natural SUSY", understood as a supersymmetric scenario where the fine-tuning is as mild as possible, is a reasonable guide to explore supersymmetric phenomenology. In this paper, we re-examine this issue in the context of the MSSM including several improvements, such as the mixing of the fine-tuning conditions for different soft terms and the presence of potential extra fine-tunings that must be combined with the electroweak one. We give tables and plots that allow to easily evaluate the fine-tuning and the corresponding naturalness bounds for any theoretical model defined at any high-energy (HE) scale. Then, we analyze in detail the complete fine-tuning bounds for the unconstrained MSSM, defined at any HE scale. We show that Natural SUSY does not demand light stops. Actually, an average stop mass below 800 GeV is disfavored, though one of the stops might be very light. Regarding phenomenology, the most stringent upper bound from naturalness is the one on the gluino mass, which typically sets the present level fine-tuning at O(1%). However, this result presents a strong dependence on the HE scale. E.g. if the latter is 10 7 GeV the level of fine-tuning is ∼ four times less severe. Finally, the most robust result of Natural SUSY is by far that Higgsinos should be rather light, certainly below 700 GeV for a fine-tuning of O(1%) or milder. Incidentally, this upper bound is not far from 1 TeV, which is the value required if dark matter is made of Higgsinos.

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Focus points and naturalness in supersymmetry

Cited by 527 publications

References 65 publications

Scenarios for gluino coannihilation

Scenarios for gluino coannihilation

Supersymmetric dark matter candidates

What is a natural SUSY scenario?

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