Updated constraints on the minimal supergravity model

Djouadi, Abdelhak; Drees, Manuel; Kneur, Jean-Loïc

doi:10.1088/1126-6708/2006/03/033

Cited by 92 publications

(88 citation statements)

References 101 publications

(61 reference statements)

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“…Our choice of parameters in the m 0 − m 1/2 plane would correspond to a stau-LSP without the right-sneutrino in the (super)particle spectrum, which is ruled out in the context of χ 0 1 -LSP scenario [19]. However with the right-sneutrino as the LSP, we find this choice to be a preferable and well-motivated option.…”

Section: Right Sneutrino Lsp In Supergravitymentioning

confidence: 94%

Right-chiral sneutrinos and long-lived staus: Event characteristics at the CERN Large Hadron Collider

2007

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We investigate the signals of a supersymmetric scenario where the lighter tausneutrino is the lightest supersymmetric particle, while the lighter stau-state is the next lightest. We confirm that such a scenario can be motivated within the framework of minimal supergravity, with just the addition of a right-chiral neutrino superfield. Such a spectrum leads to rather unusual signals of supersymmetry, showing stable tracks of the stau in the muon chambers. We have studied two types of signals, namely, (a) two or more hard jets and two stau tracks, and (b) hard jets with two muons and two stau tracks. We demonstrate that the stau tracks can be distinguished from the muonic ones through proper kinematic cuts which also enable one to remove all standard model backgrounds.

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Section: Right Sneutrino Lsp In Supergravitymentioning

confidence: 94%

Right-chiral sneutrinos and long-lived staus: Event characteristics at the CERN Large Hadron Collider

2007

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“…Only taking the WMAP upper limit allows for the possibility of multicomponent dark matter [46]. Other constraints applied to the mSUGRA parameter points include the g µ − 2 [47] constraint −11.4 × 10 −10 ≤ δ (g µ − 2) ≤ 9.4 × 10 −9 and constraints from B-physics measurements [48][49][50] which yield flavor constraints from the data, i.e. 2.77 × 10 −4 ≤ Br (b → sγ) ≤ 4.37 × 10 −4 (where this branching ratio has the NNLO correction [51]) and Br (B s → µ + µ − ) ≤ 1.1 × 10 −8 .…”

Section: Higgs Mass In Minimal Sugramentioning

confidence: 99%

Higgs boson mass predictions in supergravity unification, recent LHC-7 results, and dark matter

et al. 2012

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LHC-7 has narrowed down the mass range of the light Higgs boson. This result is consistent with the supergravity unification framework, and the current Higgs boson mass window implies a rather significant loop correction to the tree value, pointing to a relatively heavy scalar sparticle spectrum with universal boundary conditions. It is shown that the largest value of the Higgs boson mass is obtained on the Hyperbolic Branch of radiative breaking. The implications of light Higgs boson in the broader mass range of 115 GeV to 131 GeV and a narrower range of 123 GeV to 127 GeV are explored in the context of the discovery of supersymmetry at LHC-7 and for the observation of dark matter in direct detection experiments.

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“…In addition a number of indirect experimental constraints were imposed, which include those from the Tevatron, Belle/BaBar/Cleo and Brookhaven experiments. Specifically we impose the conservative constraints (−11.4 × 10 −10 ) ≤ δ (g µ − 2) ≤ (9.4 × 10 −9 ), see [36,37], [38], and 2.77 ≤ Br (b → sγ) × 10 4 ≤ 4.27 [39].…”

Section: Analysis Of the Parameter Space And Sparticle Massesmentioning

confidence: 99%

Predictive signatures of supersymmetry: Measuring the dark matter mass and gluino mass with early LHC data

et al. 2011

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We present a focused study of a predictive unified model whose measurable consequences are immediately relevant to early discovery prospects of supersymmetry at the LHC. ATLAS and CMS have released their analysis with 35 pb −1 of data and the model class we discuss is consistent with this data. It is shown that with an increase in luminosity the LSP dark matter mass and the gluino mass can be inferred from simple observables such as kinematic edges in leptonic channels and peak values in effective mass distributions. Specifically, we consider cases in which the neutralino is of low mass and where the relic density consistent with WMAP observations arises via the exchange of Higgs bosons in unified supergravity models. The magnitudes of the gaugino masses are sharply limited to focused regions of the parameter space, and in particular the dark matter mass lies in the range ∼ (50 − 65) GeV with an upper bound on the gluino mass of 575 GeV, with a typical mass of 450 GeV. We find that all model points in this paradigm are discoverable at the LHC at √ s = 7 TeV. We determine lower bounds on the entire sparticle spectrum in this model based on existing experimental constraints. In addition, we find the spin-independent cross section for neutralino scattering on nucleons to be generally in the range of σ SĨ χ 0 1 p = 10 −46±1 cm 2 with much higher cross sections also possible. Thus direct detection experiments such as CDMS and XENON already constrain some of the allowed parameter space of the low mass gaugino models and further data will provide important cross-checks of the model assumptions in the near future.

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Updated constraints on the minimal supergravity model

Cited by 92 publications

References 101 publications

Right-chiral sneutrinos and long-lived staus: Event characteristics at the CERN Large Hadron Collider

Right-chiral sneutrinos and long-lived staus: Event characteristics at the CERN Large Hadron Collider

Higgs boson mass predictions in supergravity unification, recent LHC-7 results, and dark matter

Predictive signatures of supersymmetry: Measuring the dark matter mass and gluino mass with early LHC data

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