Revisiting no-scale supergravity inspired scenarios: Updated theoretical and phenomenological constraints

Benhenni, Amine; Kneur, Jean-Loïc; Moultaka, G.; Bailly, Sean

doi:10.1103/physrevd.84.075015

Cited by 5 publications

(5 citation statements)

References 126 publications

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“…Such a scenario has been studied assuming stau as the NLSP and gravitino as the LSP in Refs. [77,78,79,80]. However, the gravitino mass should be heavier compared to the gaugino mass in no-scale supergravity, and the parameter space satisfying all the constraints discussed above have heavy gaugino mass M 1/2 1800 GeV from the later study.…”

Section: Dark Matter In No-scale Mssmmentioning

confidence: 99%

Supernatural MSSM

Nanopoulos

Raza

et al. 2015

Phys. Rev. D

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We point out that the electroweak fine-tuning problem in the supersymmetric Standard Models (SSMs) is mainly due to the high energy definition of the fine-tuning measure. We propose super-natural supersymmetry which has an order one high energy fine-tuning measure automatically. The key point is that all the mass parameters in the SSMs arise from a single supersymmetry breaking parameter. In this paper, we show that there is no supersymmetry electroweak fine-tuning problem explicitly in the Minimal SSM (MSSM) with no-scale supergravity and Giudice-Masiero (GM) mechanism. We demonstrate that the Z-boson mass, the supersymmteric Higgs mixing parameter µ at the unification scale, and the sparticle spectrum can be given as functions of the universal gaugino mass M 1/2 . Because the light stau is the lightest supersymmetric particle (LSP) in the no-scale MSSM, to preserve R parity, we introduce a 1 E-mail:gldu@itp.ac.cn 2 E-mail:tli@itp.ac.cn 3 E-mail:dimitri@physics.tamu.edu 4 E-mail:shabbar@itp.ac.cn 1 arXiv:1502.06893v1 [hep-ph] 24 Feb 2015 non-thermally generated axino as the LSP dark matter candidate. We estimate the lifetime of the light stau by calculating its 2-body and 3-body decays to the LSP axino for several values of axion decay constant f a , and find that the light stau has a lifetime ττ 1 in [10 −4 , 100] s for an f a range [10 9 , 10 12 ] GeV. We show that our next to the LSP stau solutions are consistent with all the current experimental constraints, including the sparticle mass bounds, B-physics bounds, Higgs mass, cosmological bounds, and the bounds on long-lived charge particles at the LHC.

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Section: Dark Matter In No-scale Mssmmentioning

confidence: 99%

Supernatural MSSM

Nanopoulos

Raza

et al. 2015

Phys. Rev. D

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“…Other indirect constraints, such as B → sγ measurements, LEP Higgs mass bounds, etc, can be accomodated for sufficiently large m 1/2 . In our case, m 1/2 limits translate into bounds on η 0 values, favouring lower values η 0 < ∼ 8 − 10 (depending on other parameters, B 0 etc) [4]. But it is still possible to have viable parameter regions with non-trivial m 1/2 minima, including even a decoupled supersymmetric spectrum with a light SM-like Higgs, when η 0 ≃ 0.…”

Section: No-scale Favored Regionsmentioning

confidence: 67%

“…(1.1). Assuming furthermore µ ∼ m 1/2 , the latter minimization takes the convenient form [6,4] V f ull (m 1/2 ) + 1…”

Section: The Minimization Proceduresmentioning

confidence: 99%

“…, should be imposed only after the global minimum in the three directions v u , v d , m 1/2 has been found. This implies deviations of a few percent in the m 1/2 minima values when taken into account properly [4].…”

Section: The Minimization Proceduresmentioning

confidence: 99%

“…Modern MSSM spectrum calculation tools allow to incorporate the full one-loop as well as dominant two-loop contributions to the effective scalar potential and other important radiative corrections. We will take advantage of this to go further in the study of no-scale models [4], implementing the minimization mechanism within SuSpect [5]. In a generalized no-scale inspired framework, it first requires the definition of the soft parameters at the GUT scale…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Revisiting No-Scale Supergravity inspired scenarios : updated theoretical and phenomenological constraints

Benhenni¹,

Kneur²,

Moultaka³

et al. 2012

Proceedings of XXIst International Europhysics Conference on High Energy Physics — PoS(EPS-HEP2011)

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We consider no-scale supergravity inspired scenarios, emphasizing the possible dynamical determination of the soft supersymmetry-breaking parameters as triggered by the radiative corrections that lift an essentially flat tree-level potential in the hidden sector. We (re)emphasize the important role played by the scale-dependent vacuum energy contribution to the effective potential for the occurrence of consistent no-scale minima. The most relevant input parameters are introduced as B 0 (the soft breaking mixing Higgs parameter) and η 0 (the cosmological constant value at high energy) instead of m 1/2 and tan β , the latter being determined through a (generalized) potential minimization at electroweak scales. We examine the theoretical and phenomenological viability of such a mechanism when confronted with up-to-date calculations of the low energy sparticle spectrum and with present constraints from the LHC and other observables. The tight dark matter relic density constraint for a neutralino LSP scenario can be considerably relaxed for a gravitino LSP scenario possible in this framework.

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Implications of a 125 GeV Higgs for supersymmetric models

et al. 2012

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Preliminary results of the search for a Standard Model like Higgs boson at the LHC with 5 fb-1 data have just been presented by the ATLAS and CMS collaborations and an excess of events at a mass of ~125 GeV has been reported. If this excess of events is confirmed by further searches with more data, it will have extremely important consequences in the context of supersymmetric extensions of the Standard Model and, in particular the minimal one, the MSSM. We show that for a standard-like Higgs boson with a mass 123 < M_h < 127 GeV, several unconstrained or constrained (i.e. with soft supersymmetry-breaking parameters unified at the high scale) MSSM scenarios would be excluded, while the parameters of some other scenarios would be severely restricted. Examples of constrained MSSM scenarios which would be disfavoured as they predict a too light Higgs particle are the minimal anomaly and gauge mediated supersymmetry breaking models. The gravity mediated constrained MSSM would still be viable, provided the scalar top quarks are heavy and their trilinear coupling large. Significant areas of the parameter space of models with heavy supersymmetric particles, such as split or high-scale supersymmetry, could also be excluded as, in turn, they generally predict a too heavy Higgs particle.Comment: 14 pages, 5 figures. v2: references added, a few typos corrected. v3: additional discussions on non decoupling limit and minor improvement

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Revisiting no-scale supergravity inspired scenarios: Updated theoretical and phenomenological constraints

Cited by 5 publications

References 126 publications

Supernatural MSSM

Supernatural MSSM

Revisiting No-Scale Supergravity inspired scenarios : updated theoretical and phenomenological constraints

Implications of a 125 GeV Higgs for supersymmetric models

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