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Search for a Light Charged Higgs Decaying into cb in the CMS experiment with pp collisions at √s=8 TeV
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | 양운기 | - |
| dc.contributor.author | 좌연재 | - |
| dc.date.accessioned | 2017-07-19T09:12:40Z | - |
| dc.date.available | 2017-07-19T09:12:40Z | - |
| dc.date.issued | 2016-08 | - |
| dc.identifier.other | 000000136793 | - |
| dc.identifier.uri | https://hdl.handle.net/10371/131647 | - |
| dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 물리·천문학부, 2016. 8. 양운기. | - |
| dc.description.abstract | This document describes the first attempt to search for a charged Higgs boson decaying to c¯b in top quark events in a CMS data corresponding to 19.7 fb−1 at √s= 8 TeV in LHC. The tt event in lepton+jets channel consists of a lepton, missing transverse energy, two b-jets, and two light quark jets in the final state. If a charged Higgs is produced in place of the hadronic W and it decays to cb, one more b-jet will be found in the final state. Selected tt events are thrown to a kinematic fitter for the full reconstruction constraining both leptonic and hadronic top quark mass, and leptonic W to their PDG values. The di-jet invariant mass is the only free parameter and reveals W mass from the SM tt events. This analysis looks for an excess over the hadronic W in the di-jet mass distribution in two b-tagged and three b-tagged events simultaneously.Upper limits on the branching ratio of a top quark decaying to a charged Higgs and b quark with 95% C.L. are placed at ~ 1% for H± mass of 90 to 150 GeV/c2 in null hypothesis. | - |
| dc.description.tableofcontents | Chapter 1 Introduction 1
1.1 The Standard Model 1 1.2 Extra Higgs boson 3 1.2.1 Beyond Standard Model Higgs Sector 3 1.2.2 Charged Higgs Boson 5 Chapter 2 Large Hadron Collider and CMS detector 6 2.1 Large Hadron Collider 6 2.2 Compact Muon Solenoid 8 2.2.1 Coordinate Convention 10 2.2.2 Superconducting Solenoid 11 2.2.3 Tracking Detectors 11 2.2.4 Caloriemeter Subdetectors 11 2.2.5 Muon Detectors 12 2.2.6 Trigger 12 Chapter 3 Data and Simulated Sample 14 3.1 Simulation Samples 15 3.2 Data samples and Trigger 15 Chapter 4 Event Selection 18 4.1 Object Identification and Selection 18 4.1.1 Pre-selection cuts 21 4.1.2 Data driven QCD sample 24 4.2 Treatment on two or more b-tagged Sample 25 4.3 Event Yields and Control Region Plots 26 Chapter 5 Top Specific Correction 35 5.1 Top Specific Correction Performance 41 Chapter 6 tt Event Reconstruction 43 6.1 Kinematic fitter 43 6.2 Goodness Cut 45 6.3 High H± mass fitter 48 6.4 Kinematic Fitter Performance 52 6.5 Mass Template 56 Chapter 7 Systematic Uncertainty 60 Chapter 8 Fit onB(t -> H±b) 75 8.1 Upper limit on B(t ! H±b) at 95% CL with Stat. Error 75 8.2 Upper limit on B(t ! H±b) at 95% CL with Syst. Error 76 Chapter 9 Result and Summary 80 A Appendix 87 A.1 Measurements of Jet Response and its Uncertainty 87 A.2 Mass Templates: H± vs W± in tt 88 Abstract in Korean 97 | - |
| dc.format | application/pdf | - |
| dc.format.extent | 10548315 bytes | - |
| dc.format.medium | application/pdf | - |
| dc.language.iso | en | - |
| dc.publisher | 서울대학교 대학원 | - |
| dc.subject | Charged Higgs | - |
| dc.subject | Two Higgs Doublet Model | - |
| dc.subject | Multi Higgs Doublet Model | - |
| dc.subject.ddc | 523 | - |
| dc.title | Search for a Light Charged Higgs Decaying into cb in the CMS experiment with pp collisions at √s=8 TeV | - |
| dc.type | Thesis | - |
| dc.description.degree | Master | - |
| dc.citation.pages | 96 | - |
| dc.contributor.affiliation | 자연과학대학 물리·천문학부 | - |
| dc.date.awarded | 2016-08 | - |
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