LEADER 03424nam 22006135 450 001 9910863187203321 005 20250610110125.0 010 $a3-030-54288-2 024 7 $a10.1007/978-3-030-54288-7 035 $a(CKB)4100000011401243 035 $a(MiAaPQ)EBC6321313 035 $a(DE-He213)978-3-030-54288-7 035 $a(PPN)250215470 035 $a(MiAaPQ)EBC6321253 035 $a(MiAaPQ)EBC29228831 035 $a(EXLCZ)994100000011401243 100 $a20200827d2020 u| 0 101 0 $aeng 135 $aurcnu|||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aSearching for Squarks $ein Compressed States and States with Jets from Charm Quarks with the Atlas Detector /$fby Samuel Jones 205 $a1st ed. 2020. 210 $cSpringer International Publishing$d2020 210 1$aCham :$cSpringer International Publishing :$cImprint: Springer,$d2020. 215 $a1 online resource (235 pages) 225 1 $aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 311 08$a3-030-54287-4 327 $aIntroduction -- 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. 330 $aThis thesis focuses on searches for squarks with the ATLAS detector in "compressed" scenarios where the scalar top is very close in mass to the lightest supersymmetric particle. These models are theoretically appealing because the presence of a quasi-degenerate scalar top enhances the self-annihilation cross-section of the lightest supersymmetric particle, acting therefore as a regulator of the dark matter relic density. Two main analyses are presented: the first is a search for scalar tops decaying to charm quarks. The identification of jets originating from the charm quark is very challenging due to its short lifetime. The calibration of tools for charm-tagging has paved the way to measuring the decay of the Higgs boson to pairs of charm quarks. The second analysis presented is the development of a novel technique for reconstructing low momentum b-hadrons. This tool has enabled the ATLAS collaboration to explore topologies that were previously inaccessible. 410 0$aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 606 $aParticles (Nuclear physics) 606 $aQuantum field theory 606 $aPhysical measurements 606 $aMeasurement 606 $aElementary Particles, Quantum Field Theory$3https://scigraph.springernature.com/ontologies/product-market-codes/P23029 606 $aMeasurement Science and Instrumentation$3https://scigraph.springernature.com/ontologies/product-market-codes/P31040 615 0$aParticles (Nuclear physics) 615 0$aQuantum field theory. 615 0$aPhysical measurements. 615 0$aMeasurement. 615 14$aElementary Particles, Quantum Field Theory. 615 24$aMeasurement Science and Instrumentation. 676 $a539.72167 676 $a539.72167 700 $aJones$b Samuel$4aut$4http://id.loc.gov/vocabulary/relators/aut$0823098 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910863187203321 996 $aSearching for Squarks$94165820 997 $aUNINA