LEADER 03766nam 22005415 450 001 996418437003316 005 20200901103559.0 010 $a3-030-52877-4 024 7 $a10.1007/978-3-030-52877-5 035 $a(CKB)4100000011413923 035 $a(DE-He213)978-3-030-52877-5 035 $a(MiAaPQ)EBC6331613 035 $a(PPN)250221454 035 $a(EXLCZ)994100000011413923 100 $a20200901d2020 u| 0 101 0 $aeng 135 $aurnn|008mamaa 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aSearches for Supersymmetric Particles in Final States with Multiple Top and Bottom Quarks with the Atlas Detector$b[electronic resource] /$fby Chiara Rizzi 205 $a1st ed. 2020. 210 1$aCham :$cSpringer International Publishing :$cImprint: Springer,$d2020. 215 $a1 online resource (XIX, 279 p. 164 illus., 152 illus. in color.) 225 1 $aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 311 $a3-030-52876-6 327 $aStandard Model and Supersymmetry -- LHC and ATLAS -- Proton-Proton Interactions and Their Simulationproton-Proton Interactions and Their Simulation -- Event Reconstruction -- Statistical Methods -- Common Aspects to SUSY searches with Multiple b-jets and ETmiss -- Search for Gluino Air Production -- Search for Higgsino Pair Production -- Comparison with Other ATLAS and CMS Searches -- Conclusion -- Appendix. 330 $aThis PhD thesis documents two of the highest-profile searches for supersymmetry performed at the ATLAS experiment using up to 80/fb of proton-proton collision data at a center-of-mass energy of 13 TeV delivered by the Large Hadron Collider (LHC) during its Run 2 (2015-2018). The signals of interest feature a high multiplicity of jets originating from the hadronisation of b-quarks and large missing transverse momentum, which constitutes one of the most promising final state signatures for discovery of new phenomena at the LHC. The first search is focused on the strong production of a pair of gluinos, with each gluino decaying into a neutralino and a top-antitop-quark pair or a bottom-antibottom-quark pair. The second search targets the pair production of higgsinos, with each higgsino decaying into a gravitino and a Higgs boson, which in turn is required to decay into a bottom-antibottom-quark pair. Both searches employ state-of-the-art experimental techniques and analysis strategies at the LHC, resulting in some of the most restrictive bounds available to date on the masses of the gluino,neutralino, and higgsino in the context of the models explored. 410 0$aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 606 $aElementary particles (Physics) 606 $aQuantum field theory 606 $aMathematical physics 606 $aElementary Particles, Quantum Field Theory$3https://scigraph.springernature.com/ontologies/product-market-codes/P23029 606 $aTheoretical, Mathematical and Computational Physics$3https://scigraph.springernature.com/ontologies/product-market-codes/P19005 615 0$aElementary particles (Physics). 615 0$aQuantum field theory. 615 0$aMathematical physics. 615 14$aElementary Particles, Quantum Field Theory. 615 24$aTheoretical, Mathematical and Computational Physics. 676 $a539.72 700 $aRizzi$b Chiara$4aut$4http://id.loc.gov/vocabulary/relators/aut$0843834 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a996418437003316 996 $aSearches for Supersymmetric Particles in Final States with Multiple Top and Bottom Quarks with the Atlas Detector$91882730 997 $aUNISA