Implications of an axino LSP for naturalness

Abstract

Both the naturalness of the electroweak symmetry breaking and the resolution of the strong CP problem may require a small Higgsino mass $\mu$ generated by a realization of the DFSZ axion model. Assuming the axino is the lightest supersymmetric particle, we study its implications on $\mu$ and the axion scale. Copiously produced light Higgsinos at collider (effectively only neutral NLSP pairs) eventually decay to axinos leaving prompt multi-leptons or displaced vertices which are being looked for at the LHC. We use latest LHC7+8 results to derive current limits on $\mu$ and the axion scale. Various Higgsino-axino phenomenology is illustrated by comparing with a standard case without lightest axinos as well as with a more general case with additional light gauginos in the spectrum.

arXiv comment22 pages, 20 figures. v2: published version updated with LHC 14 TeV projections

References in corpus (64)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• FastJet user manual
• MadGraph 5 : Going Beyond
• Matching matrix elements and shower evolution for top-quark production in hadronic collisions
• Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics
• Natural SUSY Endures
• Search for direct production of charginos, neutralinos and sleptons in final states with two leptons and missing transverse momentum in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Experimental Signatures of Low Energy Gauge Mediated Supersymmetry Breaking
• Radiative natural SUSY with a 125 GeV Higgs boson
• Searches for electroweak production of charginos, neutralinos, and sleptons decaying to leptons and W, Z, and Higgs bosons in pp collisions at 8 TeV
• SUSY, the Third Generation and the LHC
• Supersymmetry, Naturalness, and Signatures at the LHC
• Production of dark matter axions from collapse of string-wall systems
• Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in sqrt(s) = 8TeV pp collisions with the ATLAS detector
• Mass Splitting between Charged and Neutral Winos at Two-Loop Level
• Search for charginos nearly mass-degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Massive Doublet Leptons
• Hunting Quasi-Degenerate Higgsinos
• Axino Mass in Supergravity Models
• Compressed electroweakino spectra at the LHC
• Axino Mass
• Probing Light Higgsinos in Natural SUSY from Monojet Signals at the LHC
• Displaced Supersymmetry
• Signatures of Axinos and Gravitinos at Colliders
• Long-Lived Neutralino NLSPs
• Monojets and mono-photons from light higgsino pair production at LHC14
• Search for a light Higgs boson decaying to long-lived weakly-interacting particles in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Prospects to study a long-lived charged next lightest supersymmetric particle at the LHC
• Measurement of angular correlations in Drell-Yan lepton pairs to probe Z/gamma* boson transverse momentum at sqrt(s)=7 TeV with the ATLAS detector
• Triggers for displaced decays of long-lived neutral particles in the ATLAS detector
• Solving the Tension between High-Scale Inflation and Axion Isocurvature Perturbations
• Prompt Decays of General Neutralino NLSPs at the Tevatron
• Electroweakinos in the Light of the Higgs Boson
• Higgs and Z-boson Signatures of Supersymmetry
• Mainly axion cold dark matter from natural supersymmetry
• Dark matter in the Kim-Nilles mechanism
• Effective interactions of axion supermultiplet and thermal production of axino dark matter
• Mixed axion/neutralino dark matter in the SUSY DFSZ axion model
• Cosmology of the DFSZ axino
• Cornering electroweakinos at the LHC
• General Neutralino NLSPs at the Early LHC
• Search for resonant pair production of neutral long-lived particles decaying to bbbar in ppbar collisions at sqrt(s)=1.96 TeV
• Direct Chargino-Neutralino Production at the LHC: Interpreting the Exclusion Limits in the Complex MSSM
• The abundance of relativistic axions in a flaton model of Peccei-Quinn symmetry
• Review of axino dark matter
• Thermal inflation, baryogenesis and axions
• The Reach of Tevatron Upgrades in Gauge-Mediated Supersymmetry Breaking Models
• String theoretic QCD axions in the light of PLANCK and BICEP2
• Higgs signal in Chargino-Neutralino production at the LHC
• Wh plus missing-E_T signature from gaugino pair production at the LHC
• The Reach of the CERN Large Hadron Collider for Gauge-Mediated Supersymmetry Breaking Models
• Collider signals from slow decays in supersymmetric models with an intermediate-scale solution to the mu problem
• Excess Higgs Production in Neutralino Decays
• Cosmological constraints on a Peccei-Quinn flatino as the lightest supersymmetric particle
• Long-lived higgsinos as probes of gravitino dark matter at the LHC
• Gaugino physics of split supersymmetry spectrum at the LHC and future proton colliders
• Search for heavy metastable particles decaying to jet pairs in pp collisions at sqrt{s} = 1.96 TeV
• Axion Dark Matter with High-Scale Inflation
• Phenomenological Implications of Low Energy Supersymmetry Breaking
• Axinos in Cosmology and at Colliders
• Anatomizing Exotic Production of the Higgs Boson
• Resolving the existence of Higgsinos in the LHC inverse problem
• PQ-symmetry for a small Dirac neutrino mass, dark radiation and cosmic neutrinos

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