Constraints on the pMSSM from searches for squarks and gluinos by ATLAS

Strübig, A.; Caron, S.; Rammensee, M.

doi:10.1007/jhep05(2012)150

Cited by 7 publications

(6 citation statements)

References 70 publications

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“…A large fraction of these previous studies, including our own [9], focused on the possibility of relatively light sparticles with all masses in the SUSY spectrum being below ∼ 1 TeV which now seems to be disfavored (though not yet excluded). Our earlier results [9], as well as the parallel studies of these same model sets [11], both conclude that nearly all (∼ 99%) of such models are now excluded by the ATLAS and CMS SUSY searches. This being the case, it is well motivated to generate new sets of pMSSM models with soft SUSY breaking parameters above 1 TeV, that can not be so easily excluded in the near future, and can be used for LHC and other studies.…”

Section: Introductionmentioning

confidence: 55%

“…Given our choices for the pMSSM parameter scan ranges, it is relatively unlikely for a random model in our scan to have squarks or gluinos light enough to be observed with this amount of data at the LHC. Other potential reasons for models to have been missed by these 7 TeV 1 fb −1 ATLAS searches, including compressed sparticle spectra, have been thoroughly discussed [11] in existing studies of the Figure 16: Effective mass distribution for events passing the cuts of the two jet signal region from the ATLAS jets plus MET search [48]. The SM background is shown in gray, with our signal prediction (blue) and the corresponding ATLAS signal prediction (green) on top, for the benchmark mSUGRA point m 0 = 660 GeV, m1 2 = 240 GeV, A 0 = 0 GeV, tan β = 10, µ > 0.…”

Section: Lhc Met Searchesmentioning

confidence: 99%

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The new look pMSSM with neutralino and gravitino LSPs

et al. 2012

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The pMSSM provides a broad perspective on SUSY phenomenology. In this paper we generate two new, very large, sets of pMSSM models with sparticle masses extending up to 4 TeV, where the lightest supersymmetric particle (LSP) is either a neutralino or gravitino. The existence of a gravitino LSP necessitates a detailed study of its cosmological effects and we find that Big Bang Nucleosynthesis places strong constraints on this scenario. Both sets are subjected to a global set of theoretical, observational and experimental constraints resulting in a sample of ∼ 225k viable models for each LSP type. The characteristics of these two model sets are briefly compared. We confront the neutralino LSP model set with searches for SUSY at the 7 TeV LHC using both the missing (MET) and non-missing E T ATLAS analyses. In the MET case, we employ Monte Carlo estimates of the ratios of the SM backgrounds at 7 and 8 TeV to rescale the 7 TeV data-driven ATLAS backgrounds to 8 TeV. This allows us to determine the pMSSM parameter space coverage for this collision energy. We find that an integrated luminosity of ∼ 5 − 20 fb −1 at 8 TeV would yield a substantial increase in this coverage compared to that at 7 TeV and can probe roughly half of the model set. If the pMSSM is not discovered during the 8 TeV run, then our model set will be essentially void of gluinos and lightest first and second generation squarks that are < ∼ 700 − 800 GeV, which is much less than the analogous mSUGRA bound. Finally, we demonstrate that non-MET SUSY searches continue to play an important role in exploring the pMSSM parameter space. These two pMSSM model sets can be used as the basis for investigations for years to come.

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Section: Introductionmentioning

confidence: 55%

Section: Lhc Met Searchesmentioning

confidence: 99%

The new look pMSSM with neutralino and gravitino LSPs

et al. 2012

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“…Several groups have advocated the use of the pMSSM for interpretation of LHC results [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. Most of these studies use estimated experimental efficiencies and acceptances for pMSSM points, and compare them to the model-independent limits from a selection of LHC searches to constrain the pMSSM parameter space.…”

Section: Jhep10(2015)134mentioning

confidence: 99%

Summary of the ATLAS experiment’s sensitivity to supersymmetry after LHC Run 1 — interpreted in the phenomenological MSSM

Aad

Bergeås

Brenner

et al. 2015

J. High Energ. Phys.

100

169

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A summary of the constraints from the ATLAS experiment on R-parityconserving supersymmetry is presented. Results from 22 separate ATLAS searches are considered, each based on analysis of up to 20.3 fb −1 of proton-proton collision data at centre-of-mass energies of √ s = 7 and 8 TeV at the Large Hadron Collider. The results are interpreted in the context of the 19-parameter phenomenological minimal supersymmetric standard model, in which the lightest supersymmetric particle is a neutralino, taking into account constraints from previous precision electroweak and flavour measurements as well as from dark matter related measurements. The results are presented in terms of constraints on supersymmetric particle masses and are compared to limits from simplified models. The impact of ATLAS searches on parameters such as the dark matter relic density, the couplings of the observed Higgs boson, and the degree of electroweak fine-tuning is also shown. Spectra for surviving supersymmetry model points with low fine-tunings are presented. The ATLAS collaboration 58 Keywords: Hadron-Hadron Scattering IntroductionDuring the first run of the Large Hadron Collider (LHC), the ATLAS [1] and CMS [2] Collaborations performed a wide range of searches for supersymmetry (SUSY) [3][4][5][6][7][8][9][10][11], using proton-proton (pp) collision data at centre-of-mass energies ( √ s) of 7 and 8 TeV. SUSY, a theoretically favoured framework for extending the Standard Model (SM), is able to address some of its unanswered questions, particularly the hierarchy problem [12][13][14][15], which is related to the fine-tuning needed to obtain the correct mass for the observed Higgs boson. SUSY can also provide credible dark matter candidates [16,17] and can improve the unification of the electroweak and strong interactions [18][19][20][21][22][23][24][25][26].The minimal supersymmetric extension of the Standard Model (MSSM) [27][28][29][30][31] predicts partners for each of the SM states. It predicts a pair of scalar partners -one for each fermion chirality -for each of the SM quarks and leptons. These spin-zero partner particles are known as squarks (q) and sleptons (˜ ) respectively. In the first two generations the pair of chiral partners is largely unmixed, so the mass states can be labelledẽ L andẽ R , where the L and R subscripts denote the scalar partners of the left-and right-handed Standard Model fermion states respectively. In the third generation of quarks and leptons the mixing between the scalars is larger, and the mixed states are labelled by their mass indices e.g.t 1 and t 2 , wheret 1 is lighter by construction. Each state in the SM gluon colour octet has a spinhalf partner known as a gluinog. There are a total of eight spin-half partners of the electroweak gauge and Higgs bosons: the neutral bino (superpartner of the U(1) gauge field); the winos, which are a charged pair and a neutral particle (superpartners of the W bosons of the SU(2) L gauge fields); and the Higgsinos, which are two neutral particles and a charged pai...

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“…Within the constrained MSSM (CMSSM) resulting limits can be used to exclude squarks and gluinos with masses below 1 − 1.4 TeV [4,5]. Exact exclusion limits, however, depend on the detailed structure of the underlying model parameters and become much weaker, e.g., in parameter regions with compressed spectra where final-state jets do not pass the cuts applied in the experimental searches [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

NLO corrections to squark-squark production and decay at the LHC

Hollik

Lindert

Pagani

2013

J. High Energ. Phys.

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We present the analysis of the signature 2j + ETmiss (+X) via squark-squark production and direct decay into the lightest neutralino, pp -> squark squark -> j j chi_1^0 chi_1^0 (+X), in next-to-leading order QCD within the framework of the minimal supersymmetric standard model. In our approximation the produced squarks are treated on shell. Thus, the calculation of production and decay factorizes. In this way, we provide a consistent, fully differential calculation of NLO QCD factorizable corrections to the given processes. Clustering final states into partonic jets, we investigate the experimental inclusive signature 2j + ETmiss for several benchmark scenarios. We compare resulting differential distributions with leading-order approximations rescaled by a flat K-factor and examine a possible impact for cut-and-count searches for supersymmetry at the LHC.Comment: 42 pages, 15 figures; to be published in JHE

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Constraints on the pMSSM from searches for squarks and gluinos by ATLAS

Cited by 7 publications

References 70 publications

The new look pMSSM with neutralino and gravitino LSPs

The new look pMSSM with neutralino and gravitino LSPs

Summary of the ATLAS experiment’s sensitivity to supersymmetry after LHC Run 1 — interpreted in the phenomenological MSSM

NLO corrections to squark-squark production and decay at the LHC

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