Natural SUSY endures

By J. Ruderman, A. Weiler. Journal of High Energy Physics, 2011

593 citations recorded by the source corpus.

The first 1 fb−1 of LHC searches have set impressive limits on new colored particles decaying to missing energy. We address the implication of these searches for naturalness in supersymmetry (SUSY). General bottom-up considerations of natural electroweak symmetry breaking show that higgsinos, stops, and the gluino should not be too far above the weak scale. The rest of the spectrum, including the squarks of the first two generations, can be heavier and beyond the current LHC reach. We have used collider simulations to determine the limits that all of the 1 fb−1 searches pose on higgsinos, stops, and the gluino. We find that stops and the left-handed sbottom are starting to be constrained and must be heavier than about 200–300 GeV when decaying to higgsinos. The gluino must be heavier than about 600–800 GeV when it decays to stops and sbottoms. While these findings point toward scenarios with a lighter third generation split from the other squarks, we do find that moderately-tuned regions remain, where the gluino is just above 1 TeV and all the squarks are degenerate and light. Among all the searches, jets plus missing energy and same-sign dileptons often provide the most powerful probes of natural SUSY. Overall, our results indicate that natural SUSY has survived the first 1 fb−1 of data. The LHC is now on the brink of exploring the most interesting region of SUSY parameter space.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/181a894e5360c4a0c77e4cb0d9ce7c662d41be5c

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

Search for a scalar partner of the top quark in the jets plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector (2017, unknown): “Non-asymptotic higgsino: a pMSSM-inspired simplified model with a higgsino LSP, χ̃1 = mχ̃01 + 5 GeV, and mχ̃02 = mχ̃01 + 10 GeV, assumes three sets of branching ratios for the considered decays of t̃1 → tχ̃ 0 2, t̃1 → tχ̃ 0 1, t̃1 → bχ̃ ± 1 [89].”
Robust Independent Validation of Experiment and Theory: Rivet version 3 (2019, methodology): “Extraction of SM parameters for example using TopFitter [36, 37] and other phenomenological studies of the SM [38–42] have used Rivet, and it has also been employed in searching for and constraining BSM physics [43–46], sometimes making use of the related Contur package [47].”
The State of Supersymmetry after Run I of the LHC (2013, background): “Theories featuring a light third generation (or at the very least, light stops) and heavy first- and second-generation particles have recently been dubbed “natural SUSY” models [62], perhaps a concession to the fact that universal models with conventional LHC signals are no longer natural.”
Implications of a light Higgs in composite models (2012, background): “This spectrum, dubbed natural SUSY, is to date the most compelling scenario for supersymmetry [33, 34].”
Search for gluino mediated bottom- and top-squark production in multijet final states in pp collisions at 8 TeV (2013, result): “5 TeV suggested by natural models of SUSY [11], they are nonetheless among the most stringent bounds that have yet been obtained and greatly improve our results from Ref.”
Neutralino dark matter at 14 TeV and 100 TeV (2014, background): “At hadron colliders such as the Large Hadron Collider (LHC), the pair production of colored superpartners, squarks and gluinos, are the dominant SUSY processes.”
Searches for electroweak production of supersymmetric particles with compressed mass spectra in √s = 13 TeV pp collisions with the ATLAS detector (2019, background): “[5 ,1 0] [1 0, 20 ]”
Twin Higgs mechanism and a composite Higgs boson (2015, background): “This is particularly true for the case of Natural SUSY [1,2], where light stops are generally required.”
Physics opportunities of a 100 TeV proton–proton collider (2015, background): “SUSY with light third generation squarks is a well motivated [50, 114] and well studied scenario [115, 116, 117].”
Search for supersymmetry in proton-proton collisions at 13 TeV in final states with jets and missing transverse momentum (2019, background): “In the absence of extreme fine tuning [25–28] that would precisely cancel these effects, the Higgs boson mass is generically driven to the cutoff scale of validity of the theory, which could be as high as the Planck scale of quantum gravity.”
Search for electroweak production of supersymmetric states in scenarios with compressed mass spectra at √s = 13 TeV with the ATLAS detector (2017, unknown): “the weak scale [14,15], while the magnitude of the bino and”
On naturalness of the MSSM and NMSSM (2012, background): “• The CMS [1] and ATALS [2] SUSY searches constrain the colored particles stringently and push their masses towards the TeV region, except that the light stops ∼ O(200)GeV can still be allowed [3–11].”