2005 09 topwg bernardo

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Published on October 29, 2007

Author: Haralda

Source: authorstream.com

W polarization studies since Rome:  W polarization studies since Rome F. Hubaut, E. Monnier, P. Pralavorio, B. Resende – CPPM Top Working Group – 8 September 2005 Goal:  Goal 1 : Compare fast sim / full sim using TopReX 2 : Compare TopReX / MC@NLO Work presented in ATLAS-SN-2005-052 use TopReX+ATLfast Samples used in the current analysis: Fast vs Full sim. comparison:  Fast vs Full sim. comparison First results with TopReX shown at Rome Good agreement, limited by statistics Since then : Improve statistics  Production at CPPM/CCIN2P3 : stat increased by 2 Improve analysis with in-situ calibration for light jets Still to be done: use full sim with cone 0.4 for jets  Currently using cone 0.7 In-situ light jet calibration:  In-situ light jet calibration Formula (cf. Clermont, Saclay) : Mass peaks a = 6 ± 1, b = 0.06 ± 0.01 (fit from 10 to 250 GeV) Comparable results obtained for MC@NLO and Toprex Quality improvement  reduce combinatorial background W mass TopReX full sim s ~2 GeV thad mass TopReX full sim <M> ~ 175 GeV s ~ 11.5  7.5 Fast vs Full sim. : Selection efficiency (%):  Fast vs Full sim. : Selection efficiency (%) Improve overall selection efficiency by 60 % with in-situ calibration Main differences arise from lepton spectra εl=90% εj=95% Fast vs Full sim. : Lepton reconstruction:  Fast vs Full sim. : Lepton reconstruction Electron PT Electron η Muon PT Muon η Matter effects, Brem. Fast vs Full sim. : reconstructed masses:  Fast vs Full sim. : reconstructed masses 174.6 GeV σ=7.2 GeV 173.2 GeV σ=7.7 GeV Hadronic top mass Leptonic top mass ttbar mass 175.2 ± 0.3 GeV σ=7.5 ± 0.4 GeV 172.7 ± 0.3 GeV σ=7.4 ± 0.4 GeV Fair agreement for reconstruted top masses Mtt spectrum slightly shifted Fast vs Full sim. : W polarization (1):  Selection cuts and reconstruction distort the parton level distribution: Fast vs Full sim. : W polarization (1) Reconstruction and cuts parton level Correction function Standard Model LO : F0=0.703 FL=0.297 FR=0.000  Fair agreement between full and fast simulation Fast vs Full sim. : W polarization (2):  Fast vs Full sim. : W polarization (2) F0=0.699 ± 0.005 FL=0.299 ± 0.003 FR=0.002 ± 0.003 F0=0.677 ± 0.016 FL=0.308 ± 0.009 FR=0.015 ± 0.009 TopReX, selection+ reconstrcution + correction Fit results with 2 parameters (constraint F0+FL+FR=1) TopReX full sim 1.5 fb-1 TopReX ATLfast 10 fb-1 TopReX vs. MC@NLO comparison:  TopReX vs. MC@NLO comparison Generator comparison No EW NLO effect : W polarization at parton level should be the same Pythia vs. Herwig may create differences Samples  Use full sim data for comparison TopReX vs. MC@NLO : Selection efficiency (%):  TopReX vs. MC@NLO : Selection efficiency (%) Expected differences in jets, more surprising for leptons TopReX vs MC@NLO : Lepton reconstruction:  TopReX vs MC@NLO : Lepton reconstruction Electron PT Electron η Muon PT Muon η TopReX vs. MC@NLO : reconstructed masses:  TopReX vs. MC@NLO : reconstructed masses 175.2 ± 0.3 GeV σ=7.5 ± 0.4 GeV 172.7 ± 0.3 GeV σ=7.4 ± 0.4 GeV Hadronic top mass Leptonic top mass ttbar mass 174.6 ± 0.4 GeV σ=7.2 ± 0.6 GeV 171.9 ± 0.4 GeV σ=8.5 ± 0.8 GeV Very good agreement for reconstructed top masses and Mtt spectrum TopReX vs. MC@NLO : W polarization (1):  TopReX vs. MC@NLO : W polarization (1) Reconstruction and cuts parton level Correction function  Very good agreement within statistics Same W polarization, as expected TopReX vs. MC@NLO : W polarization (2):  TopReX vs. MC@NLO : W polarization (2) F0=0.698 ± 0.025 FL=0.394 ± 0.013 FR=0.008 ± 0.013 Fit results with 2 parameters (constraint F0+FL+FR=1) MC@NLO full sim 0.5 fb-1 F0=0.677 ± 0.016 FL=0.308 ± 0.009 FR=0.015 ± 0.009 TopReX full sim 1.5 fb-1 Selection + reconstruction + correction Problem with Herwig-ATLfast for W polarization:  Problem with Herwig-ATLfast for W polarization Reconstruction and cuts parton level To have a more detailed comparison  increase stat  fast sim Correction function Problem in Herwig-ATLfast interface ? Understand this problem before concluding Conclusions:  Conclusions Work since Rome: implement in-situ calibration, double full sim stat (TopReX) Current status for W polarisation: Correction functions weakly affected by change full sim / fast sim Similar conclusion for MC@NLO / TopReX Analogous study on spin correlation underway Samples listed in CERN wiki (under construction) : Dileptonic sample : 10.0.1 simulation being done (no TRT problem ?), reco soon Redo all analyses with AOD ... Work started AOD vs CBNT (1):  AOD vs CBNT (1) Performed by Chengguang Zhu (SDU) in collaboration with CPPM Systematics comparison : spectrum for objects (example: jets,pTmiss) Reconstructed top masses (example hadronic top mass) AOD vs CBNT (2):  AOD vs CBNT (2) W polarization (with no correction function, no in-situ calibration) Nice agreement, study to be completed with full stat SPARES:  SPARES Spare: Event reconstruction:  Spare: Event reconstruction Select 2 non-b jets with Mjj closest to MW Select the b jet with Mjjb closest to Mt PTmissPTν ; Pzν by constraining Mlν to Mw Select the b jet closest to the lepton Select the n with Mlνb closest to Mt Quality cuts : D(MWhad) < 20 GeV D(Mtop) < 35 GeV Spare: W polarization:  W polarization is measured through angular distribution of charged lepton: Spare: W polarization Longitudinal W+ Fraction F0 Left-handed W+ Fraction FL Right-handed W+ Fraction FR

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