A light sneutrino rescues the light stop

Abstract

Stop searches in supersymmetric frameworks with $R$-parity conservation usually assume the lightest neutralino to be the lightest supersymmetric particle. In this paper we consider an alternative scenario in which the left-handed tau sneutrino is lighter than neutralinos and stable at collider scales, but possibly unstable at cosmological scales. Moreover the (mostly right-handed) stop $\tilde{t}$ is lighter than all electroweakinos, and heavier than the scalars of the third generation doublet, whose charged component, $\tilde{\tau }$, is heavier than the neutral one, $\tilde{\nu }$. The remaining supersymmetric particles are decoupled from the stop phenomenology. In most of the parameter space, the relevant stop decays are only into $t\tilde{\tau }\tau$, $t\tilde{\nu }\nu$ and $b\tilde{\nu }\tau$ via off-shell electroweakinos. We constrain the branching ratios of these decays by recasting the most sensitive stop searches. Due to the "double invisible" kinematics of the $\tilde{t}\to t\tilde{\nu }\nu$ process, and the low efficiency in tagging the $t\tilde{\tau }\tau$ decay products, light stops are generically allowed. In the minimal supersymmetric standard model with $\sim$ 100 GeV sneutrinos, stops with masses as small as $\sim$ 350 GeV turn out to be allowed at 95% CL.

arXiv comment25 pages

References in corpus (46)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• FastJet user manual
• Results from a search for dark matter in the complete LUX exposure
• Theories with Gauge-Mediated Supersymmetry Breaking
• Did LIGO detect dark matter?
• The Physics of Heavy Z' Gauge Bosons
• SARAH 4: A tool for (not only SUSY) model builders
• SPheno 3.1: extensions including flavour, CP-phases and models beyond the MSSM
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• The Radial Acceleration Relation in Rotationally Supported Galaxies
• Dark Matter Results from First 98.7-day Data of PandaX-II Experiment
• The Standard Model from extra dimensions
• Dirac Gaugino Masses and Supersoft Supersymmetry Breaking
• Supersymmetry and Electroweak breaking from extra dimensions at the TeV-scale
• Tensionless Strings and the Weak Gravity Conjecture
• Designing and recasting LHC analyses with MadAnalysis 5
• Heavy Sneutrinos as Dark Matter
• Soft Masses in Theories with Supersymmetry Breaking by TeV-Compactification
• Light Stau Phenomenology and the Higgs γγRate
• On Black Holes in Massive Gravity
• Search for Heavy Neutral and Charged Leptons in e+ e- Annihilation at LEP
• Sneutrino cold dark matter, a new analysis: relic abundance and detection rates
• Search for long-lived charged particles in proton-proton collisions at sqrt(s) = 13 TeV
• Right-handed sneutrino as thermal dark matter
• Search for Stable and Long-Lived Massive Charged Particles in e+e- Collisions at sqrt(s) = 183-209 GeV
• The Effective Theory of the Light Stop Scenario
• Maximally Natural Supersymmetry
• Diphoton decays of stoponium at the Large Hadron Collider
• Hairy Black Holes in Massive Gravity: Thermodynamics and Phase Structure
• Production and Decay of Scalar Stoponium Bound States
• Light Stops, Light Staus and the 125 GeV Higgs
• Supersymmetry and precision data after LEP2
• Search for pair-production of long-lived heavy charged particles in e+e- annihilation
• Top-squark in natural SUSY under current LHC run-2 data
• Search for Heavy Stable and Long-Lived Particles in e+e- Collisions at sqrt(s)=189 GeV
• Constraints on sneutrino dark matter from LHC Run 1
• Multi-lepton signatures at LHC from sneutrino dark matter
• The Light Stop Scenario from Gauge Mediation
• Hiding Missing Energy in Missing Energy
• Confronting SUSY models with LHC data via electroweakino production
• Simplified Supersymmetry with Sneutrino LSP at 8 TeV LHC
• Natural Supersymmetry from Extra Dimensions
• Higgs-Stoponium Mixing Near the Stop-Antistop Threshold
• Re-reheating, late entropy injection and constraints from baryogenesis scenarios

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