Electroweak gauginos with highly boosted hadronically decaying bosons at the LHC / / Yuta Okazaki

• Record Nr.: UNINA9910637714103321
• Autore: Okazaki Yuta
• Pubbl/distr/stampa: Singapore : , : Springer, , [2023]; ©2023
• ISBN: 9789811965937; 9789811965920
• Descrizione fisica: 1 online resource (230 pages)
• Collana: Springer Theses
• Disciplina: 297.05
• Soggetti: Bosons
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Nota di bibliografia: Includes bibliographical references.
• Nota di contenuto: Intro -- Supervisor's Foreword -- Preface -- Parts of this book have been published in the following journal articles -- Acknowledgements -- Contents -- Acronyms -- 1 Introduction -- References -- 2 Theoretical Background -- 2.1 The Standard Model -- 2.2 Supersymmetry -- 2.2.1 R-parity -- 2.2.2 SUSY Breaking -- 2.3 Minimal Supersymmetric Standard Model -- 2.3.1 Particle Contents in MSSM -- 2.3.2 Soft Breaking and the Soft Term in the MSSM Lagrangian -- 2.3.3 Gaugino Mass -- 2.3.4 SUSY Solutions of the SM Problems in the MSSM -- 2.3.5 Target Scenarios and Signal Models -- 2.3.6 Signal Topology -- 2.3.7 Current Limits by Collider Experiments -- 2.3.8 Current Limits by Other Experiments -- 2.4 Other SUSY Models -- 2.4.1 Soft Breaking Mechanism -- 2.4.2 General Gauge Mediation Scenario -- 2.4.3 Naturalness Driven Axino LSP Scenario -- References -- 3 Experimental Apparatus -- 3.1 Large Hadron Collider -- 3.2 ATLAS Detector -- 3.2.1 Coordinate Systems in ATLAS -- 3.2.2 Magnet System -- 3.2.3 Inner Detector -- 3.2.4 Calorimeters -- 3.2.5 Muon Spectrometer -- 3.2.6 Trigger and Data Acquisition -- References -- 4 Data and Monte Carlo Simulations -- 4.1 Recorded Data by the ATLAS Detector -- 4.2 Monte Carlo Simulation -- 4.2.1 Hard-Scatter Event Generation -- 4.2.2 SM Background Simulation -- 4.2.3 Signal Simulation Samples -- References -- 5 Physics Object Reconstruction -- 5.1 Overview -- 5.2 Tracks, Vertices, and Topo-clusters -- 5.3 Jets ; -- 5.3.1 Large-R Jet -- 5.3.2 Small-R Jet -- 5.3.3 Track Jet -- 5.4 Electrons and Photons -- 5.5 Muons -- 5.6 Object Selection -- 5.7 Missing Transverse Energy -- References -- 6 BosonTagging -- 6.1 Boosted W/Z Tagging -- 6.1.1 Overview -- 6.1.2 Optimization -- 6.1.3 Efficiency for Signal Jets -- 6.1.4 Efficiency for Background Jets -- 6.1.5 Physics Process Dependency -- 6.2 Vrightarrow bb Tagging Techinique.; References -- 7 Event Selection -- 7.1 Selection Strategy -- 7.2 Trigger Selection and Event Cleaning -- 7.3 Discriminating Variables -- 7.4 Preselection -- 7.5 Signal Region Selection -- 7.5.1 SR-4Q -- 7.5.2 SR-2B2Q -- References -- 8 Background Estimation -- 8.1 Strategy -- 8.2 Reducible Backgrounds Estimation -- 8.2.1 Overview -- 8.2.2 Control Regions -- 8.3 Validation for the Reducible Background Estimation -- 8.3.1 Preselection in 1L/1Y Categories -- 8.3.2 Definition of CRs and VRs in the 1L/1Y Categories -- 8.3.3 Comparison Between 0L/1L/1Y for V+jets MC -- 8.3.4 Jet Variable Comparison in the CRs and SRs/VRs -- 8.3.5 Transfer Factor Comparison -- 8.4 Physics Process Dependency in the Reducible Background Estimation and the Impact of the Composition Uncertainty -- 8.5 Irreducible Backgrounds Estimation -- Appendix -- References -- 9 Systematic Uncertainties -- 9.1 Large-R Jets -- 9.2 Boson Tagging Efficiency Uncertainty -- 9.3 Other Experimental Uncertainties -- 9.4 Theoretical Uncertainty -- 9.5 Summary of Systematic Uncertainties -- References -- 10 Results -- 10.1 Background Determination -- 10.2 Results on the Signal Regions -- 10.3 Model-Specific Exclusion Limits -- 10.3.1 (tildeW,tildeB)-SIM -- 10.3.2 (tildeW,tildeB), (tildeH,tildeB), (tildeW,tildeH) and (tildeH,tildeW) Models -- 10.3.3 (tildeH,tildeG) Model -- 10.3.4 (tildeH,tildea) Model -- References -- 11 Discussions -- 11.1 Future Prospects -- 11.1.1 Future Prospects of the Multi-lepton and Multi-b-and-1-Lepton analyses -- 11.1.2 Future Prospects of the Full-Hadronic Analysis -- 11.2 Implication to Dark Matter -- 11.2.1 tildeB-Like Dark Matter -- 11.2.2 tildeW-/tildeH-Like Dark Matter -- 11.3 Implication to Muon g-2 Anomaly -- 11.3.1 Light Electroweakino Scenarios Motivated by Muon g-2 Anomaly -- 11.4 Implication to Naturalness -- References -- 12 Conclusions.; Appendix A Supersymmetry Framework -- A.1 Operator -- A.2 Gaugino Mass Eigenstates -- A.3 Grand Unified Theory -- A.4 Couplings between Z/h and the Lightest Neutralino -- A.5 Muon g-2 Contribution of SUSY Particles -- A.6 Gauge Mediated Symmetry Breaking -- Appendix B Event Cleaning -- B.1 Event Cleaning Based on Detector Responses -- B.2 Dead Tile Module Jets Veto -- B.3 Non-collision Background Veto -- B.4 Track Jets Cleaning -- Appendix C Event Display.