Jesse Liu

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Jesse Liu


I am a PhD student on the ATLAS Experiment in the Oxford supersymmetry group. My research interests are in designing LHC discovery strategies for new dynamics, from Higgs bosons to supersymmetry and dark matter.

Phenomenology of supersymmetric dark matter
My theoretical analysis of early 13 TeV search techniques for new coloured particles identified the so-called 'Higgsino' as a promising candidate for dark matter in a 19-parameter 'pMSSM' supersymmetry framework.

Opening the soft lepton frontier for compressed electroweak SUSY
With international collaborators, I devised and led a dedicated experimental search opening sensitivity to Higgsino dark matter and bino DM with slepton coannihilators beyond LEP for the first time in nearly two decades. We targeted the very challenging 'compressed scenarios' of electroweak supersymmetry using low momentum 'soft' leptons. This research revealed striking blind spots where Higgsinos and sleptons can still be as light as 100 GeV.

Photon collider searches for new physics
When LHC beams cross, photons from the proton electromagnetic fields can collide to make new particles. The protons remain intact, travel down the beampipe, and are detected by very forward detectors. This allows reconstruction of the full missing momentum 4-vector, inaccessible to conventional searches. My proposal shows this strategy can uncover the 100 GeV slepton blind spot.

Technical detector responsibilities
Essential to these experimental results is my technical expertise in the operational performance of the ATLAS silicon tracker detector, trigger strategy design, and simulation software for new physics signatures.

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