Les Houches

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Compressed spectra, stops, EWinos

EWinos

• Proposal to study pp→ chi2,chi3 → gamma l^+ l^- chi1 chi1. Signal with low MET if chi1 much lighter than nearly degenerate chi2,chi3.
• Higgs to electroweakino ⇒ in Higgs group Higgs to electroweakino
• EWinos decays to other (light) Higgses e.g. in NMSSM ⇒ cross-section too small if decays into Higgs. Is there anything not covered by 2HDM Higgs searches? Daniele Barducci, Genevieve Belanger, Dipan Sengupta

Compressed spectra

• Analyse the decay squark → q lepton + RH sneutrino in a regime where the squark, sneutrino splitting is small (as arises in some Pati-Salam type of GUTs). Basic question: How large the splitting must be for the signal to be visible at the LHC? Leader: Werner Porod, other members:???
• What prospectfo ISR tagging?
• Studying dilepton invariant mass distribution below 20GeV might be needed if compressed spectra. Leader: ???, other members:???

Stops

• Is light stop totally excluded in the MSSM? Leader:Giacomo P. other members:??? Two holes hard to analyse: 1) stop close in mass with LSP+top, in a regime where top cross-section measurements doesn't help. 2) stop → b chargino in a regime where W is off-shell.

• Which Higgs mass tool to trust in a regime where stops are around 1TeV. Spheno,softSUSY,suspect VS. FeynHiggs VS. SUSYHD.

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