Status of Analysis The ee → WW → qqln process at 1.4 TeV Andreas A. Maier 1 1 CERN January 16, 2018 Andreas A. Maier (CERN) Status of Analysis January 16, 2018 1 / 33
Outline Event selection figures 5 Introduction 1 Events Analysis details 2 Leptons Event selection 3 Jets Event yields Derived observables 4 Single selection cuts Lepton dressing 6 Final event yield Conclusion 7 Andreas A. Maier (CERN) Status of Analysis January 16, 2018 2 / 33
Analysis goal Measurement of the triple gauge couplings in the WW final state CLIC is a gauge boson factory important for EFT 1 analyses JHEP 05, 096 (2017) scale of new physics is large and EFT serves as low energy description chose qql ν final state: Figure: The two main processes in e + e − collisions for triple gauge couplings (marked in red) and the main background process. 1 Effective Field Theory Andreas A. Maier (CERN) Status of Analysis January 16, 2018 3 / 33
Datasets Sample ID Xsec [fb] Signal qqln 3249 4309.7 Bkg qqln 3249 4309.7 Bkg qqll 3246 2725.8 Bkg qqqqln 5594 110.4 Bkg qqqqll 5572 62.1 Bkg qqqq 4034 1245.1 Bkg qqnn 2094 933.9 Bkg qqqqnn 5527 23.2 Table: Samples used in the analysis The events in the datasets are scaled with the luminosity (1.5 ab − 1 ) and their cross-section. Additionally, they are divided by the total number of entries in the dataset. W and WW → qql ν are separated by MC truth leptonic and hadronic W ± boson masses both be < 100 GeV. Andreas A. Maier (CERN) Status of Analysis January 16, 2018 4 / 33
Physics objects The physics objects used in this analysis are: Leptons Isolated leptons Jets use Pandora PFOs without isolated leptons reconstructed using the Valencia alrogithm 2 with jet size R = 0 . 8 clustering order β = 1 . 0 jet shrinking for forward jets γ = 0 . 7 Missing energy Initial state minus sum of selected jets and lepton 2 algorithm string in marlin: ‘ValenciaPlugin 0.8 1 0.7’ Andreas A. Maier (CERN) Status of Analysis January 16, 2018 5 / 33
Event selection A preliminary list of event selection cuts has been applied to select the qql ν final state: Pre-cut - an intermediate step to see separate effects Exactly one charged lepton Exactly one muon (electrons are still undressed and left out for now) Final - the preliminary full event selection The pre-cut selection Remove events with forward jets by requiring | cos θ | < 0 . 95 Maximum total jet energy < 750 GeV Lepton p T > 30 GeV Andreas A. Maier (CERN) Status of Analysis January 16, 2018 6 / 33
Outline Event selection figures 5 Introduction 1 Events Analysis details 2 Leptons Event selection 3 Jets Event yields Derived observables 4 Single selection cuts Lepton dressing 6 Final event yield Conclusion 7 Andreas A. Maier (CERN) Status of Analysis January 16, 2018 7 / 33
Signal WW → qql ν Signal qqln cut Single Total Entries Events Before cuts 100.0% 100.0% 51272 1578748.8 Lepton number 33.2% 33.2% 17029 524350.8 Muons only 55.1% 18.3% 9383 288917.9 Forward jets 49.4% 9.0% 4634 142688.4 Maximum total jet energy 96.0% 8.7% 4448 136961.2 Lepton pT 95.4% 8.3% 4243 130648.9 Table: Selection efficiencies for the signal qqln sample The relative efficiency of every selection cut is listed (‘Single’) as well as the total efficiency (‘Total’). The number of entries and the scaled number of events, using the cross-section and luminosity, are shown as well. Andreas A. Maier (CERN) Status of Analysis January 16, 2018 8 / 33
Background W → qql ν Bkg qqln cut Single Total Entries Events Before cuts 100.0% 100.0% 158673 4885801.2 Lepton number 21.5% 21.5% 34183 1052550.5 Muons only 4.0% 0.9% 1357 41784.2 Forward jets 61.4% 0.5% 833 25649.4 Maximum total jet energy 85.2% 0.4% 710 21862.1 Lepton pT 89.6% 0.4% 636 19583.5 Table: Selection efficiencies for the bkg qqln sample The relative efficiency of every selection cut is listed (‘Single’) as well as the total efficiency (‘Total’). The number of entries and the scaled number of events, using the cross-section and luminosity, are shown as well. Andreas A. Maier (CERN) Status of Analysis January 16, 2018 9 / 33
Background WW → qqll Bkg qqll cut Single Total Entries Events Before cuts 100.0% 100.0% 209945 4088700.0 Lepton number 14.6% 14.6% 30651 596931.3 Muons only 1.7% 0.2% 510 9932.3 Forward jets 46.5% 0.1% 237 4615.6 Maximum total jet energy 86.5% 0.1% 205 3992.4 Lepton pT 44.9% 0.0% 92 1791.7 Table: Selection efficiencies for the bkg qqll sample The relative efficiency of every selection cut is listed (‘Single’) as well as the total efficiency (‘Total’). The number of entries and the scaled number of events, using the cross-section and luminosity, are shown as well. Andreas A. Maier (CERN) Status of Analysis January 16, 2018 10 / 33
Outline Event selection figures 5 Introduction 1 Events Analysis details 2 Leptons Event selection 3 Jets Event yields Derived observables 4 Single selection cuts Lepton dressing 6 Final event yield Conclusion 7 Andreas A. Maier (CERN) Status of Analysis January 16, 2018 11 / 33
Final event yield Sample Entries Events Final signal qqln 4243 130648.9 Final bkg qqln 636 19583.5 Final bkg qqll 92 1791.7 Final bkg qqqqln 18635 20780.8 Final bkg qqqqll 260 95.2 Final bkg qqqq 0 0.0 Final bkg qqnn 0 0.0 Final bkg qqqqnn 5 2.6 Signal + background 23871 172902.8 Background fraction 82.2% 24.4% Table: Event yields for the final sample Andreas A. Maier (CERN) Status of Analysis January 16, 2018 12 / 33
Outline Event selection figures 5 Introduction 1 Events Analysis details 2 Leptons Event selection 3 Jets Event yields Derived observables 4 Single selection cuts Lepton dressing 6 Final event yield Conclusion 7 Andreas A. Maier (CERN) Status of Analysis January 16, 2018 13 / 33
Beam energy Signal qqln Signal qqln 0.006 0.006 Bkg qqln Bkg qqln Events Events 0.004 0.004 Bkg qqll Bkg qqll Other bkg Other bkg 0.002 0.002 0.000 0.000 0 200 400 600 800 1000 1200 1400 0 200 400 600 800 1000 1200 1400 E beam [GeV] m beam [GeV] Pre signal qqln Pre signal qqln 0.003 0.003 Pre bkg qqln Pre bkg qqln Events Events 0.002 Pre bkg qqll 0.002 Pre bkg qqll Pre other bkg Pre other bkg 0.001 0.001 0.000 0.000 0 200 400 600 800 1000 1200 1400 0 200 400 600 800 1000 1200 1400 E beam [GeV] m beam [GeV] Final signal qqln Final signal qqln 0.003 0.003 Final bkg qqln Final bkg qqln Events Events 0.002 0.002 Final bkg qqll Final bkg qqll Final other bkg Final other bkg 0.001 0.001 0.000 0.000 0 200 400 600 800 1000 1200 1400 0 200 400 600 800 1000 1200 1400 E beam [GeV] m beam [GeV] Figure: e + e − beam energy and mass Andreas A. Maier (CERN) Status of Analysis January 16, 2018 14 / 33
MC truth W ± boson masses 0.06 0.004 Signal qqln Signal qqln Bkg qqln Bkg qqln 0.04 Events Events Bkg qqll Bkg qqll 0.002 0.02 Other bkg Other bkg 0.00 0.000 0 25 50 75 100 125 150 175 200 0 200 400 600 800 1000 1200 1400 True m qq [GeV] True m l [GeV] 0.10 Pre signal qqln Pre signal qqln 0.02 Pre bkg qqln Pre bkg qqln Events Events Pre bkg qqll Pre bkg qqll 0.05 0.01 Pre other bkg Pre other bkg 0.00 0.00 0 25 50 75 100 125 150 175 200 0 200 400 600 800 1000 1200 1400 True m qq [GeV] True m l [GeV] 0.10 Final signal qqln Final signal qqln 0.02 Final bkg qqln Final bkg qqln Events Events Final bkg qqll Final bkg qqll 0.05 0.01 Final other bkg Final other bkg 0.00 0.00 0 25 50 75 100 125 150 175 200 0 200 400 600 800 1000 1200 1400 True m qq [GeV] True m l [GeV] Figure: Masses of the two W objects at truth level. Andreas A. Maier (CERN) Status of Analysis January 16, 2018 15 / 33
Outline Event selection figures 5 Introduction 1 Events Analysis details 2 Leptons Event selection 3 Jets Event yields Derived observables 4 Single selection cuts Lepton dressing 6 Final event yield Conclusion 7 Andreas A. Maier (CERN) Status of Analysis January 16, 2018 16 / 33
All leptons 0.4 0.75 Signal qqln Bkg qqln Signal qqln Events 0.50 Entries Bkg qqll Bkg qqln 0.2 Other bkg Bkg qqll 0.25 Other bkg 0.00 0.0 0 1 2 3 4 5 6 20 15 10 5 0 5 10 15 20 N lep Lepton type 1.0 Pre signal qqln 0.4 Pre bkg qqln Pre signal qqln Events Entries Pre bkg qqll 0.5 Pre bkg qqln 0.2 Pre other bkg Pre bkg qqll Pre other bkg 0.0 0.0 0 1 2 3 4 5 6 20 15 10 5 0 5 10 15 20 N lep Lepton type 1.0 Final signal qqln 0.4 Final bkg qqln Final signal qqln Events Entries Final bkg qqll 0.5 Final bkg qqln 0.2 Final other bkg Final bkg qqll Final other bkg 0.0 0.0 0 1 2 3 4 5 6 20 15 10 5 0 5 10 15 20 N lep Lepton type Figure: Total lepton number and type Andreas A. Maier (CERN) Status of Analysis January 16, 2018 17 / 33
Total energy 0.03 Signal qqln Bkg qqln Events 0.02 Bkg qqll Other bkg 0.01 0.00 0 200 400 600 800 1000 Lepton E tot [GeV] 0.002 Pre signal qqln Pre bkg qqln Events Pre bkg qqll 0.001 Pre other bkg 0.000 0 200 400 600 800 1000 Lepton E tot [GeV] Final signal qqln 0.0015 Final bkg qqln Events 0.0010 Final bkg qqll Final other bkg 0.0005 0.0000 0 200 400 600 800 1000 Lepton E tot [GeV] Figure: Total lepton energy Andreas A. Maier (CERN) Status of Analysis January 16, 2018 18 / 33
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