03424nam 22006135 450 991086318720332120250610110125.03-030-54288-210.1007/978-3-030-54288-7(CKB)4100000011401243(MiAaPQ)EBC6321313(DE-He213)978-3-030-54288-7(PPN)250215470(MiAaPQ)EBC6321253(MiAaPQ)EBC29228831(EXLCZ)99410000001140124320200827d2020 u| 0engurcnu||||||||txtrdacontentcrdamediacrrdacarrierSearching for Squarks in Compressed States and States with Jets from Charm Quarks with the Atlas Detector /by Samuel Jones1st ed. 2020.Springer International Publishing2020Cham :Springer International Publishing :Imprint: Springer,2020.1 online resource (235 pages)Springer Theses, Recognizing Outstanding Ph.D. Research,2190-50533-030-54287-4 Introduction -- Theoretical Background -- The ATLAS Experiment -- Data Acquisition and Reconstruction -- Search for SUSY in Final States with Jets from Charm Quarks -- Soft b-tagging in Compressed SUSY Scenarios -- Conclusion -- Appendix.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.Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053Particles (Nuclear physics)Quantum field theoryPhysical measurementsMeasurementElementary Particles, Quantum Field Theoryhttps://scigraph.springernature.com/ontologies/product-market-codes/P23029Measurement Science and Instrumentationhttps://scigraph.springernature.com/ontologies/product-market-codes/P31040Particles (Nuclear physics)Quantum field theory.Physical measurements.Measurement.Elementary Particles, Quantum Field Theory.Measurement Science and Instrumentation.539.72167539.72167Jones Samuelauthttp://id.loc.gov/vocabulary/relators/aut823098MiAaPQMiAaPQMiAaPQBOOK9910863187203321Searching for Squarks4165820UNINA