Hunting Quasi-Degenerate Higgsinos

Abstract

We present a new strategy to uncover light, quasi-degenerate Higgsinos, a likely ingredient in a natural supersymmetric model. Our strategy focuses on Higgsinos with inter-state splittings of O(5-50) GeV that are produced in association with a hard, initial state jet and decay via off-shell gauge bosons to two or more leptons and missing energy, $pp\to j+\text{MET}+2^{+}\ell$. The additional jet is used for triggering, allowing us to significantly loosen the lepton requirements and gain sensitivity to small inter-Higgsino splittings. Focusing on the two-lepton signal, we find the seemingly large backgrounds from diboson plus jet, $\bar{t}t$ and $Z/{\gamma }^{\ast }+j$ can be reduced with careful cuts, and that fake backgrounds appear minor. For Higgsino masses $m_{\chi }$ just above the current LEP II bound ($\mu \simeq 110$) GeV we find the significance can be as high as 3 sigma at the LHC using the existing 20 fb${}^{-1}$ of 8 TeV data. Extrapolating to LHC at 14 TeV with 100 fb${}^{-1}$ data, and as one example $M_1=M_2=500$ GeV, we find 5 sigma evidence for $m_{\chi }\lesssim 140$ GeV and 2 sigma evidence for $m_{\chi }\lesssim 200$ GeV . We also present a reinterpretation of ATLAS/CMS monojet bounds in terms of degenerate Higgsino ($\delta m_{\chi }\ll 5$) GeV plus jet production. We find the current monojet bounds on $m_{\chi }$ are no better than the chargino bounds from LEP II.

25 pages, 12 figures, 3 tables

References in corpus (13)

• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Parton distributions for the LHC
• Constraints on Dark Matter from Colliders
• The Tevatron at the Frontier of Dark Matter Direct Detection
• Supersymmetry, Naturalness, and Signatures at the LHC
• Update of Parton Distributions at NNLO
• Living Dangerously with Low-Energy Supersymmetry
• Search for the Standard Model Higgs boson in the decay channel H->ZZ(*)->4l with 4.8 fb-1 of pp collision data at sqrt(s) = 7 TeV with ATLAS
• S-particles at their naturalness limits
• Natural Priors, CMSSM Fits and LHC Weather Forecasts
• Nearly Degenerate Gauginos and Dark Matter at the LHC
• Next-to-Leading Order Predictions for Dark Matter Production at Hadron Colliders
• Supersymmetry with a Chargino NLSP and Gravitino LSP

Cited by in corpus (113)

• Exploring new models in all detail with SARAH
• Searches for electroweak production of supersymmetric particles with compressed mass spectra in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Neutralino Dark Matter at 14 and 100 TeV
• WIMPs at the Galactic Center
• Discovering Inelastic Thermal-Relic Dark Matter at Colliders
• Monojet plus soft dilepton signal from light higgsino pair production at LHC14
• Search for electroweak production of supersymmetric states in scenarios with compressed mass spectra at $\sqrt{s}=13$ TeV with the ATLAS detector
• Higgsino Dark Matter in High-Scale Supersymmetry
• Search for new physics in events with two soft oppositely charged leptons and missing transverse momentum in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Towards the Final Word on Neutralino Dark Matter
• Search for the electroweak production of supersymmetric particles in $\sqrt{s}$=8 TeV $pp$ collisions with the ATLAS detector
• Higgsino Dark Matter or Not: Role of Disappearing Track Searches at the LHC and Future Colliders
• Upper bounds on sparticle masses from naturalness or how to disprove weak scale supersymmetry
• Closing the window for compressed Dark Sectors with disappearing charged tracks
• Midi-review: Status of weak scale supersymmetry after LHC Run 2 and ton-scale noble liquid WIMP searches
• Singlet-Doublet Dark Matter Freeze-in: LHC displaced signatures versus cosmology
• Accessing the core of naturalness, nearly degenerate higgsinos, at the LHC
• The Relic Neutralino Surface at a 100 TeV collider
• Prospects for Electroweakino Discovery at a 100 TeV Hadron Collider
• New Physics Opportunities for Long-Lived Particles at Electron-Proton Colliders
• Compressing the Inert Doublet Model
• Constraining the minimal dark matter fiveplet with LHC searches
• Split Dirac Supersymmetry: An Ultraviolet Completion of Higgsino Dark Matter
• Natural SUSY with a bino- or wino-like LSP
• A new approach for detecting compressed bino/wino at the LHC
• Multi-channel assault on natural supersymmetry at the high luminosity LHC
• Search for supersymmetry in final states with two or three soft leptons and missing transverse momentum in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for pair production of higgsinos in final states with at least three $b$-tagged jets in $\sqrt{s}=13$ TeV $pp$ collisions using the ATLAS detector
• Electroweakino constraints from LHC data
• Closing up a light stop window in natural SUSY at LHC
• Neutralinos and Sleptons at the LHC in Light of Muon $(g-2{)}_{\mu }$
• The Reach of the High-Energy LHC for Gluinos and Top Squarks in SUSY Models with Light Higgsinos
• A natural Little Hierarchy for SUSY from radiative breaking of PQ symmetry
• LHC luminosity and energy upgrades confront natural supersymmetry models
• Higgs and superparticle mass predictions from the string theory landscape
• Search for supersymmetry in events with soft leptons, low jet multiplicity, and missing transverse momentum in proton-proton collisions at sqrt(s) = 8 TeV
• LHC Collider Phenomenology of Minimal Universal Extra Dimensions
• A landscape solution to the SUSY flavor and CP problems
• The Not-So-Well Tempered Neutralino
• Probing bino-wino coannihilation dark matter under the neutrino floor at the LHC
• Gluino reach and mass extraction at the LHC in radiatively-driven natural SUSY
• Top-squark in natural SUSY under current LHC run-2 data
• Supergravity gauge theories strike back: There is no crisis for SUSY but a new collider may be required for discovery
• Gravity safe, electroweak natural axionic solution to strong CP and SUSY mu problems
• Single top squark production as a probe of natural supersymmetry at the LHC
• Catching sparks from well-forged neutralinos
• Cornering Higgsino: Use of Soft Displaced Track
• Prospects for Higgs coupling measurements in SUSY with radiatively-driven naturalness
• The Search for Electroweakinos
• Anomaly mediated SUSY breaking model retrofitted for naturalness
• Naturalness versus stringy naturalness (with implications for collider and dark matter searches)
• The LHC higgsino discovery plane for present and future SUSY searches
• Implications of an axino LSP for naturalness
• What hadron collider is required to discover or falsify natural supersymmetry?
• Complementarity for Dark Sector Bound States
• Naturalness, b to s gamma, and SUSY Heavy Higgses
• Search for higgsino pair production in pp collisions at sqrt(s) = 13 TeV in final states with large missing transverse momentum and two Higgs bosons decaying via H to bb-bar
• Aspects of the same-sign diboson signature from wino pair production with light higgsinos at the high luminosity LHC
• New angular (and other) cuts to improve the higgsino signal at the LHC
• A string landscape guide to soft SUSY breaking terms
• Illuminating New Electroweak States at Hadron Colliders
• Superparticle phenomenology from the natural mini-landscape
• Higgsino Dark Matter in a Non-Standard History of the Universe
• MT2 to the Rescue -- Searching for Sleptons in Compressed Spectra at the LHC
• Deep Learning Jet Image as a Probe of Light Higgsino Dark Matter at the LHC
• An indirect probe of higgsino world at the CEPC
• LHC SUSY and WIMP dark matter searches confront the string theory landscape
• Leptonic mono-top from single stop production at LHC
• Natural Supersymmetry: Status and Prospects
• On the coverage of neutralino dark matter in coannihilations at the upgraded LHC
• Can invisible objects be `seen' via forward proton detectors at the LHC?
• Enhancing the discovery prospects for SUSY-like decays with a forgotten kinematic variable
• Dijet and electroweak limits on a $Z^{\prime }$ boson coupled to quarks
• Improving naturalness in Gauge Mediation with non-unified messenger sectors
• Di-Higgs signatures from R-parity violating supersymmetry as the origin of neutrino mass
• Searching for the light Higgsinos in MSSM at the future e-p colliders
• Radiative natural supersymmetry emergent from the string landscape
• Mirage mediation from the landscape
• New Limits on Heavier Electroweakinos and their LHC Signatures
• Probing Squeezed Bino-Slepton Spectra with the Large Hadron Collider
• Supersymmetry: Aspirations and Prospects
• Light higgsino scenario confronted with muon g-2
• Landscape Higgs and sparticle mass predictions from a logarithmic soft term distribution
• Charting generalized supersoft supersymmetry
• Search for inelastic dark matter in events with two displaced muons and missing transverse momentum in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Radiative Corrections to Aid the Direct Detection of the Higgsino-like Neutralino Dark Matter: Spin-Independent Interactions
• Is the magnitude of the Peccei-Quinn scale set by the landscape?
• Precision unification and Higgsino dark matter in GUT scale supersymmetry
• Exploring nearly degenerate higgsinos using mono-$Z/W$ signal
• Chasing New Physics in Stacks of Soft Tracks
• Taking aim at the wino-higgsino plane with the LHC
• Expanding the parameter space of natural supersymmetry
• Distribution of supersymmetry mu parameter and Peccei-Quinn scale f_a from the landscape
• Search for the SUSY Electroweak Sector at $ep$ Colliders
• Probing quadruplet scalar dark matter at current and future $pp$ colliders
• Non-thermal CMSSM with a 125 GeV Higgs
• Inert sextuplet scalar dark matter at the LHC and future colliders
• Low Fine Tuning in Yukawa-deflected Gauge Mediation
• Precision gaugino mass measurements as a probe of large trilinear soft terms at ILC
• Extending the Reach of Compressed Gluinos at the LHC
• Light Higgsino as the tail of the $\mu$-$B_{\mu }$ solution
• Limiting SUSY compressed spectra scenarios
• Status and Implications of BSM Searches at the LHC
• Probing compressed dark sectors at 100 TeV in the dileptonic mono-Z channel
• Higgsino Dark Matter in an economical Scherk-Schwarz setup
• $E_6$ Models in Light of Precision $M_W$ Measurements
• Surviving scenario of stop decays for ATLAS $\ell +jets+E_T^{miss}$ search
• Indirect Probe of Electroweak-Interacting Particles with Mono-Lepton Signatures at Hadron Colliders
• Supersymmetry with a Heavy Lightest Supersymmetric Particle
• Same-sign Higgsino Production at the CERN LHC: How Not to Hunt for Natural Supersymmetry
• General search for supersymmetric particles in scenarios with compressed mass spectra using proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Deciphering compressed electroweakino excesses with MadAnalysis 5
• Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos