This thesis focuses on searches for squarks with the ATLAS detector
in "compressed" scenarios where the scalar top is very close in
mass to the lightest supersymmetric particle. These models are
theoretically appealing because the presence of a quasi-degenerate
scalar top enhances the self-annihilation cross-section of the
lightest supersymmetric particle, acting therefore as a regulator
of the dark matter relic density. Two main analyses are presented:
the first is a search for scalar tops decaying to charm quarks. The
identification of jets originating from the charm quark is very
challenging due to its short lifetime. The calibration of tools for
charm-tagging has paved the way to measuring the decay of the Higgs
boson to pairs of charm quarks. The second analysis presented is
the development of a novel technique for reconstructing low
momentum b-hadrons. This tool has enabled the ATLAS collaboration
to explore topologies that were previously inaccessible.
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