Implications of LHC searches on SUSY particle spectra

Arbey, Alexandre; Battaglia, M.; Mahmoudi, F.

doi:10.1140/epjc/s10052-011-1847-3

Cited by 72 publications

(16 citation statements)

References 79 publications

(67 reference statements)

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“…As explained above, this is mainly a consequence of the flavour observables ∆ 0− , A F B (B → K * µ + µ − ), and the g − 2 constraint, which play a dominant role in driving the profile likelihood results when relaxing the Planck constraint on the neutralino relic density. 7 Similar patterns can be observed for spin-dependent neutralino-proton and neutralinoneutron scattering (central and right-hand panels). The narrow region at low mχ0 plane for all three analyses, and also shows up in the mχ0…”

Section: Jhep09(2014)081supporting

confidence: 67%

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Profile likelihood maps of a 15-dimensional MSSM

Strege

Bertone

Besjes

et al. 2014

J. High Energ. Phys.

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We present statistically convergent profile likelihood maps obtained via global fits of a phenomenological Minimal Supersymmetric Standard Model with 15 free parameters (the MSSM-15), based on over 250M points. We derive constraints on the model parameters from direct detection limits on dark matter, the Planck relic density measurement and data from accelerator searches. We provide a detailed analysis of the rich phenomenology of this model, and determine the SUSY mass spectrum and dark matter properties that are preferred by current experimental constraints. We evaluate the impact of the measurement of the anomalous magnetic moment of the muon (g − 2) on our results, and provide an analysis of scenarios in which the lightest neutralino is a subdominant component of the dark matter. The MSSM-15 parameters are relatively weakly constrained by current data sets, with the exception of the parameters related to dark matter phenomenology (M 1 , M 2 , µ), which are restricted to the sub-TeV regime, mainly due to the relic density constraint. The mass of the lightest neutralino is found to be < 1.5 TeV at 99% C.L., but can extend up to 3 TeV when excluding the g − 2 constraint from the analysis. Low-mass bino-like neutralinos are strongly favoured, with spin-independent scattering cross-sections extending to very small values, ∼ 10 −20 pb. ATLAS SUSY null searches strongly impact on this mass range, and thus rule out a region of parameter space that is outside the reach of any current or future direct detection experiment. The best-fit point obtained after inclusion of all data corresponds to a squark mass of 2.3 TeV, a gluino mass of 2.1 TeV and a 130 GeV neutralino with a spin-independent cross-section of 2.4×10 −10 pb, which is within the reach of future multi-ton scale direct detection experiments and of the upcoming LHC run at increased centre-of-mass energy.

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Section: Jhep09(2014)081supporting

confidence: 67%

“…The pMSSM has been studied in the past using random scans [6][7][8], as well as Bayesian methods [9][10][11][12]. Both approaches have limitations.…”

Section: Jhep09(2014)081mentioning

confidence: 99%

Profile likelihood maps of a 15-dimensional MSSM

Strege

Bertone

Besjes

et al. 2014

J. High Energ. Phys.

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“…To further illustrate the latter feature we display in the left panel of figure 2 the maximal value for the h → γγ decay width normalised to its SM value, that can be obtained for fixed mτ 1 . In order to arrive at the plot we have used the results from a general 19 parameter scan in the phenomenological MSSM, as described in [84,85]. The fast decoupling of the stau corrections in Γ(h → γγ) is evident from the figure.…”

Section: Jhep01(2013)061mentioning

confidence: 99%

MSSM: cornered and correlated

Haisch

Mahmoudi

2013

J. High Energ. Phys.

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Inspired by the latest results of ATLAS and CMS on the search for the standard model (SM) Higgs scalar, we discuss in this article the correlations between Higgs-boson properties, low-energy observables, such as B → X s γ, B s → µ + µ − , and (g − 2) µ , and the dark matter (DM) relic density. We focus on the corners of the MSSM parameter space where the pp → h → γγ signal is enhanced due to the presence of a light stau state. In this region tan β, M A , A t , and µ take large values, and we find striking correlations between many of the considered observables. In particular, the B → X s γ branching fraction is enhanced, while the B s → µ + µ − rate tends to be below the SM expectation. In contrast, the Higgs-boson couplings show good overall agreement with the preliminary experimental determinations, the DM abundance is consistent with observation, and the discrepancy in (g − 2) µ is reduced. The predicted deviations and found correlations could be tested in the near future and hence may become very valuable as guidelines and consistency checks.

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“…We perform flat random scans on the standard parameters, similarly to [7][8][9]. The phases however are very severely constrained by the electric dipole moment (EDM) measurements given in Tab.…”

Section: Methodsmentioning

confidence: 99%