Theory Seminar (High Energy/Cosmology)

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Electroweak inos, natural SUSY and HL-LHC
Date: Thursday, May 5th
Time: 3:30 pm
Place: 5310 Chamberlin Hall
Speaker: Howard Baer
Abstract: Recent clarifications in naturalness require light higgsinos ~100-200 GeV while stops are highly mixed but can lie in the multi-TeV range at little cost to naturalness. These qualities means the expected mass hierarchy of electroweak-inos is inverted from the usual case in that higgsinos lie at the lower mass rungs while gauginos lie at higher mass. Qualitatively new signatures for SUSY discovery at LHC then appear. Gluino pair cascade decays should contain distinctive low invariant mass dilepton pairs. A new same-sign diboson signature emerges from wino pair production which should provide the greatest reach for HL-LHC in the gaugino mass direction. Soft dilepton pairs from higgsino pair production recoiling againsthard jets should give HL-LHC reach in the higgsino mass direction. It appears that 3000 fb-1 should be sufficient to cover natural SUSY parameter space with better than 3% electroweak fine-tuning. I also mention implications of naturalness for ILC searches and for higgsino-like WIMP and axion dark matter searches.
Host: Vernon Barger
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