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This thesis discusses searches for electroweakly produced
supersymmetric partners of the gauge and the Higgs bosons (gauginos
and higgsinos) decaying to multiple leptons, using pp collisions at
sqrt(s) = 13 TeV. The thesis presents an in-depth study of multiple
searches, as well as the first 13 TeV cross section measurement for
the dominant background in these searches, WZ production. Two
searches were performed using 36.1/fb of data: the gaugino search,
which makes use of a novel kinematic variable, and the higgsino
search, which produced the first higgsino limits at the LHC. A
search using 139/fb of data makes use of a new technique developed
in this thesis to cross check an excess of data above the
background expectation in a search using a Recursive Jigsaw
Reconstruction technique. None of the searches showed a significant
excess of data, and limits were expanded with respect to previous
results. These searches will benefit from the addition of
luminosity during HL-LHC; however, the current detector will not be
able to withstand the increase in radiation. Electronics for the
detector upgrade are tested and irradiated to ensure their
performance.
This thesis discusses searches for electroweakly produced
supersymmetric partners of the gauge and the Higgs bosons (gauginos
and higgsinos) decaying to multiple leptons, using pp collisions at
sqrt(s) = 13 TeV. The thesis presents an in-depth study of multiple
searches, as well as the first 13 TeV cross section measurement for
the dominant background in these searches, WZ production. Two
searches were performed using 36.1/fb of data: the gaugino search,
which makes use of a novel kinematic variable, and the higgsino
search, which produced the first higgsino limits at the LHC. A
search using 139/fb of data makes use of a new technique developed
in this thesis to cross check an excess of data above the
background expectation in a search using a Recursive Jigsaw
Reconstruction technique. None of the searches showed a significant
excess of data, and limits were expanded with respect to previous
results. These searches will benefit from the addition of
luminosity during HL-LHC; however, the current detector will not be
able to withstand the increase in radiation. Electronics for the
detector upgrade are tested and irradiated to ensure their
performance.
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