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Four top search in hadronic channel

Four top search in hadronic channel. SEP. 5 , 2017 JONGSEOK LEE ( SUNGKYUNKWAN UNIVERSITY). Contents. Plan for 2016-2017 Four top search Displaced muon perfomance (service work) Phi asymmetry in FLUKA simulation (service work) Geant4 simulation (service work) Plan for 2017-2018.

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Four top search in hadronic channel

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  1. Four top search in hadronic channel SEP. 5, 2017 JONGSEOK LEE ( SUNGKYUNKWAN UNIVERSITY)

  2. Contents • Plan for 2016-2017 • Four top search • Displaced muon perfomance (service work) • Phi asymmetry in FLUKA simulation (service work) • Geant4 simulation (service work) • Plan for 2017-2018

  3. Plan for H++ analysis at 2016 & 2017

  4. Plan for service work at 2016 & 2017 Complete

  5. Feynman diagrams for 4top Leading-order Feynman diagrams for 4top production in the SM from gluon-gluon fusion (left) and quark-antiquark annihilation (right)

  6. Decays of a top quark _ q ν q l b b W W t t Hadronic (left) and Leptonic (right) decays of a top quark

  7. W+ decay modes BR(4top  hadrons) = 20%

  8. Channels of top

  9. Number of jets IsHadronTrig // jet_pt>30, |jet_eta|<2.4, jet_LooseId normalized to 1 normalized to 1 normalized to 1 normalized to 1 9

  10. HT IsHadronTrig normalized to 1 normalized to 1

  11. Cut criteria • Step1(Skim) : NJet>=6, NBJet>=2 • Step2(HLT) : IsHadronTrig • Step3(Event selection for ttbar) : HT>600 • Step4(Event selection for lepton channel) : (NLooseMuon+NLooseElectron)==0&&MET<100 • Step5(Events selection for ttbar) : NJet>=10&&NBJet>=3

  12. Cut efficiency

  13. Cut efficiency

  14. Number of expected events at 36fb-1

  15. HT at 36fb-1 IsHadronTrig 15

  16. HT at 36fb-1 IsHadronTrig 16

  17. Cut criteria • Step1(Skim) : NJet>=6, NBJet>=2 • Step2(HLT) : IsHadronTrig • Step3(Event selection for ttbar) : HT>600 • Step4(Event selection for lepton channel) : (NLooseMuon+NLooseElectron)==0&&MET<100 • Step5(Events selection for ttbar) : (NJet-NBJet)>=8&&NBJet>=4

  18. Number of expected events at 36fb-1

  19. W and top reconstruction 1. Choose 1st~8th highest pt jet 2. Choose a best 4Mjj combination by minimum(|MW - <Mjj>|) 3. Choose 1st~4th highest pt bjet 4. Choose a best 4Mjjb combination by minimum(|Mtop - <Mjjb>|)

  20. ΔRmin and number of particles

  21. <Mjj> of best 4Mjj NJet>=6, NBJet>=2, IsHadronTrig normalized to 1

  22. Number of Mjj in best 4Mjj NJet>=6, NBJet>=2, IsHadronTrig normalized to 1 22

  23. <Mjjb> of best 4Mjjb NJet>=6, NBJet>=2, IsHadronTrig normalized to 1

  24. Number of Mjjb in best 4Mjj NJet>=6, NBJet>=2, IsHadronTrig normalized to 1 24

  25. Number of expected events at 36fb-1 • Step1(Skim) : NJet>=6, NBJet>=2 • Step2(HLT) : IsHadronTrig • Step3(Event selection for ttbar) : HT>600 • Step4(Event selection for lepton channel) : (NLooseMuon+NLooseElectron)==0&&MET<100 • Step5(Events selection for ttbar) : NW>=4&&Ntop>=3

  26. Displaced muon perfomance • Development of displaced muon gun • Production of displaced muon gun sample • Analysis

  27. Parameters for simulation • CMSSW_8_1_0_pre6 • d0_max = 250cm • d0_min = 20cm • eta_max = 2.9 • eta_min = -2.9 • pt_max = 100 • pt_min = 1.0 • 40k events

  28. Efficiency : PT VS η(displaced stand alone muon) 28

  29. Efficiency : PT VS η(displaced stand alone muon) 29

  30. Efficiency : dz VS η(displaced stand alone muon) dz vs η (≡a=b/c, efficiency) dz vs η (≡b, associated) dz vs η (≡c, simulated) 30

  31. Phi asymmetry in FLUKA simulation 31

  32. phi asymmetry in CSCs Background rate Jian Wang’s slide FLUKA simulation 5k events Normalized to L=10.9x10E33 Hz/cm2 Version 3.0.0.0

  33. phi asymmetry in RE-4 Data FLUKA simulation 5k events Normalized to L=1x10E34 Hz/cm2 Version 3.0.0.0

  34. phi asymmetry in DTs 34

  35. Geant4 simulation • Installation and tutorial : https://indico.cern.ch/event/636105/contributions/2574992/attachments/1452248/2239804/170502_Jongseok_Lee_Geant4_installation_and_tutorial.pdf 35

  36. Electron scattering Aluminium foil 0.52mm e- 13MeV

  37. Electron scattering (13MeV, Al) log scale normalization 37

  38. Simplified calorimeter with layers of two materials e- 50MeV

  39. e- beam (50MeV)

  40. Energy deposit VS Track length e- 50MeV e- 50MeV dE/dx = 1/5 e- 500MeV e- 500MeV

  41. Synchrotron radiation 1 Tesla vacuum 500m3 e 10GeV

  42. e 10GeV, 1Tesla, 500m3

  43. Plan for 2017-2018

  44. backup

  45. 2017년도 이론물리 대학원생 파견 공모 https://www.nrf.re.kr/biz/notice/view?nts_no=94429&menu_no=44&biz_no=&search_type=&search_keyword=&page=k

  46. 2017년도 한-스위스 박사과정생 연수사업 신규과제 공모 https://www.nrf.re.kr/biz/notice/view?nts_no=93878&menu_no=&biz_no=&search_type=ALL&search_keyword=&page=6

  47. top trigger  Trigger for 2016 Run2016B-H 25 ns 23Sep2016ReReco data with RunIISummer16 Moriond17_80X MC https://twiki.cern.ch/twiki/bin/viewauth/CMS/TopTrigger

  48. Number of leptons IsHadronTrig tight leptons normalized to 1 tight leptons normalized to 1 loose leptons normalized to 1 loose leptons normalized to 1 48

  49. MET IsHadronTrig normalized to 1 normalized to 1

  50. Search for standard model production of four top quarks in proton-proton collisions at 13 TeV (CMS PAS TOP-16-016) • A search for events containing four top quarks has been performed • using 2.6 fb-1 of data recorded by the CMS experiment at 13 TeV. • The analysis focuses on a combination of the single lepton channel in the μ + jets and e + jets final states and dilepton channel in the μμ, μe, and ee final states. • An event classification scheme based on a BDT algorithm is defined. • ex) BDT = jet_pt*0.1 + sin(pt*3) + cos(Njets) BDT output distribution in the μ+jets channel

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