CSCObjectSelection of topview
A) Semileptonic ttbar Events: 1) Leptons Number of Isolated Leptons: exactly 1 Electrons must have a Pt higher (or equal) to 20GeV Muons must have a Pt higher (or equal) to 20GeV Use Tight leptons 2) Jets Number of Jets: at least 4 Jets must have a Pt higher (or equal) to 30GeV Number of b-jets: at least 2 3) Missing Pt missing should be higher (or equal) to 20GeV B) Trigger: at level 1 EM25 (MU20 or MU40) for electrons (muons) at Level 2 and EF, E25I (MU20I) for electrons (muons).
Qualities | e cut pt>20GeV | e cut pt>25GeV | comments |
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4+ jets | 59.3% | 59.9% | jet which is close to selected electron deltaR<0.1 is considered as a electron. 4% electron as above is not selected in e events (2% in all events), and 28% events with 3 jets, means 28%*2%=0.56% events, electron helps to pass cut of 4+jets |
all jets tag efficiency | 26.6% | 26.5% | more electron-jets come in to worsen the efficiency |
electron purity | 98.4% | 98.8% | higher fake rate for low pt electrons |
electron reconstruction efficiency | 69.6% | 70.2% | a little bit higher for high pt electron |
electron selection efficiency | 51.2% | 46.9% | |
kinematic cut | 9.77% | 9.43% | |
ljet rejection | 131 | 133 | same as above |
quality cut | 2.93% | 2.81% |
Assigned to | Due date | Description | State | Closed | Notify | |
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ChengguangZhu | 2007-12-08 | purpose: 1.fix the bug on electron-jet removal 2.Use 2 steps on objects selection: preselection and final selection. procedure: 1.put pre and loose selection on e muon and jets before ttbar alg 2.preselect electron of all pt, abs(eta)<2.5, robust isolated , care about isolation in crack. robust loose isEM (check isEM on crack) 3.preselect muon of all pt, abs(eta),2.5, robust isolated, (isolation on crack), robust combined (depend on ID detector) 4.jets with pt>10GeV and abs(eta)<2.5, don't divide ljets and bjets 5.Set ntuple for preselected objects, not on all objects 6.do final and tight selection of them in ttbar alg 7.From preselected containers, use tight selection cut put them into new containers, set ntuple: nselelec nselmuon nseljets, nselbjets |
edit |
1. from background: tau events and combinatoral background has diffirent shape compared to signal. the variation of 10% (change the quantity of the background level) of tau event has no impact on the measurement (sn-2005), the cmbk is not valuated in that note, but its shape correlated with almost all object variation, means error from cmbk correlate with almost all other systematic errors 2.from correction function: the error should be trivial, increasing the statistics of MC. This correction function (efficiency function later called) is taken for mixing signal and background. My logic is to substract the background from data and calculate the correction function with only signal. The argument is my method will bring more error? true. Is there any paper using the correction operate on mixed signal and background? I should understand how much error my method introduced. 3. more systematic errors: b jet miscalibration use variation of 3% but not inlcude the revaluating of etmiss. etmiss miscalibration correlate with b jet calibraiton and (pile-up?), etmiss resolution should be one more.
1. bias of A measurement too large, may not put in the CSC note. 2.truth info of A not readable. to look at MCNLO event if no-correlation data give correct resuts to check if my code is correct.
Correction function is applied on pure signal or mixed signal and background? parton level distribution of cospsi is only for pure signal, as
reco level distribution of data is mixed signal and background (tau event and cmbk), as In exist analysis, correction function is done unpon the 2 distribution above. The correction function is to correct the acceptance(cut etc..) and resolution effect. Same cuts operate on different physics channel, the acceptance is different, apparently, the selection efficiencies are different, background is rejected and signal is more reserved. cs should be as high as possible, and cb as low as possible. Assume: the MC same as data for signal and background, correct proportion. the upper correction function could be regarded as 2 parts: in parton level and , which is all data from parton level to reco level and . The points are signal in paton level has a expected shape on cospsi. tau events has a paton level shape too, cmbk and other background heavily denpends on the event reconstruction method, may has a specific shape or flat in parton level. We see that the distribution of them are totally different and correction function for each are different too. For a specific value of , for example, 0.2. In parton level, the quantity of events are
Assigned to | Due date | Description | State | Closed | Notify | |
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ChengguangZhu | 2007-12-13 | look for paper using correction funtion mixing bkgd and signal; check truth of MCNLO data for A and Ad | edit |
L1 trig: correction fucntion: 1.079624+(0.149426)*x+(-1.221292)*x*x+(0.304894)*x*x*x+(1.180660)*x*x*x*x A: 0.815048 error: 0.167271 L2 trig: correction fucntion: 1.079624+(0.149426)*x+(-1.221292)*x*x+(0.304894)*x*x*x+(1.180660)*x*x*x*x A: 0.731522 error: 0.170414 L3 trig: correction fucntion: 1.079624+(0.149426)*x+(-1.221292)*x*x+(0.304894)*x*x*x+(1.180660)*x*x*x*x A: 0.710314 error: 0.171958%ENDHIDE%
Assigned to | Due date | Description | State | Closed | Notify | |
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ChengguangZhu | 2007-12-20 | with trigger, A and Ad changes, to test what kind of events are triggered off, and have bias on A and Ad | edit |
L1_trig : correction fucntion: 0.986804+(-0.150406)*x Ad: -0.432209 error: 0.101379 L2_trig : correction fucntion: 0.986804+(-0.150406)*x Ad: -0.409707 error: 0.104382 EF_trig : correction fucntion: 0.986804+(-0.150406)*x Ad: -0.396277 error: 0.105264%ENDHIDE%
Assigned to | Due date | Description | State | Closed | Notify | |
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ChengguangZhu | 2007-12-07 | quality of the ttbar reconstruction; angle resolutions for spin correlations; resolution of cospsi PHI, PSI of pure signals, cmbks; use fit for PSI other than mean; distribution of Ad according ptele or l_pt; Fast measurement is corrected to truth value?; what is the differece beteen fast and full, which makes the full simulation so large deviation on measurement, can be corrected? | edit |
root [0] .L method2_a.cxx root [1] CheckObjects(1) in Initialized() ..... in parAEfficiencyFunctionFromMC() ..... efficiency func for par A: 1.098214+(0.212162)*x+(-1.114520)*x*x+(-0.168282)*x*x*x+(0.416528)*x*x*x*x in TruthParATest()..... The mean of coslep*cpshad_lej*(-9)/0.51 :0.332396 and error:0.0244047 in PerfectMCTest() ..... The mean of coslep*cpshad_lej*(-9)/0.51 :0.383894 and error:0.160355 in UnPerfectMCTest() ..... The mean of coslep*cpshad_lej*(-9)/0.51 :0.794352 and error:0.176444 in ReconstructionEffiencyDiffernece() ..... in ElectronPtResolutionDifference() ..... in ChooseCorrections() ..... all corrections: (((nselelec+nselmuon==1 && nselmuon==1)*m_reco_effi_diff_num(ptmuon_true,etamuon_true))+((nselelec+nselmuon==1 && nselelec==1)*e_reco_effi_diff_num(ptele_true,etaele_true)))*(((nselelec+nselmuon==1 && nselelec==1)*ElectronResolutionEffectDist(ptele_true))+(nselelec+nselmuon==1 && nselmuon==1)) in CorrectionsTransformToParameterA() ..... fit the correction to parameter A Correction func for par A: 0.877674+(-0.015678*x)+(0.033812*x*x) The mean of coslep*cpshad_lej*(-9)/0.51 :0.755641 and error:0.164871
root [0] .L method2_ad.cxx root [1] CheckObjects(1) in Initialized() ..... in parAEfficiencyFunctionFromMC() ..... efficiency func for par Ad: 0.976399+(-0.073418)*x in TruthParATest()..... The mean of cosphilep_lej*(-3)/0.51 :-0.175966 and error:0.0143719 in PerfectMCTest() ..... The mean of cosphilep_lej*(-3)/0.51 :-0.166506 and error:0.0945965 in UnPerfectMCTest() ..... The mean of cosphilep_lej*(-3)/0.51 :-0.338016 and error:0.102039 in ReconstructionEffiencyDiffernece() ..... in ElectronPtResolutionDifference() ..... in ChooseCorrections() ..... all corrections: (((nselelec+nselmuon==1 && nselmuon==1)*m_reco_effi_diff_num(ptmuon_true,etamuon_true))+((nselelec+nselmuon==1 && nselelec==1)*e_reco_effi_diff_num(ptele_true,etaele_true)))*(((nselelec+nselmuon==1 && nselelec==1)*ElectronResolutionEffectDist(ptele_true))+(nselelec+nselmuon==1 && nselmuon==1)) in CorrectionsTransformToParameterA() ..... fit the correction to parameter A Correction func for par A: 0.862251+(-0.007647*x)+(0.051789*x*x) The mean of cosphilep_lej*(-3)/0.51 :-0.349955 and error:0.0948953
I | Attachment | History | Action | Size | Date | Who | Comment |
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cxx | T7CSCnote_et25.cxx | r2 r1 | manage | 16.5 K | 2008-03-07 - 09:49 | ChengguangZhu | |
T7polarization.pdf | r1 | manage | 177.0 K | 2007-11-29 - 11:11 | ChengguangZhu | e | |
gif | fakeelectron.gif | r1 | manage | 9.5 K | 2007-11-30 - 17:11 | ChengguangZhu | Fake electron rate v.s. pt of electron |
gif | fit_cospsi_with_new_corrfun.gif | r2 r1 | manage | 13.3 K | 2007-12-08 - 16:10 | ChengguangZhu | |
gif | fit_cospsi_with_new_corrfun2.gif | r2 r1 | manage | 12.1 K | 2007-12-08 - 16:08 | ChengguangZhu | |
gif | fit_cospsi_with_old_corrfun.gif | r1 | manage | 11.4 K | 2007-12-01 - 13:04 | ChengguangZhu | Fit cospsi of "ept>25G" data with old efficiency function |
gif | parA_with_correction.gif | r1 | manage | 23.2 K | 2007-12-06 - 17:46 | ChengguangZhu | for parameter A, correction from reconstruction efficiencya and e pt resolution is added. |
gif | parAd_with_correction.gif | r1 | manage | 27.8 K | 2007-12-06 - 18:22 | ChengguangZhu | parameter Ad, correction with reco effi and e pt reso |
ppt | top_zhucg_SDU_20070321_2.ppt.ppt | r1 | manage | 1883.0 K | 2007-11-30 - 18:12 | ChengguangZhu | in ppt 1 |
ppt | top_zhucg_SDU_20070418_5.ppt | r1 | manage | 1168.5 K | 2007-11-30 - 18:12 | ChengguangZhu | in ppt 2 |
gif | ttbar_spin_correl_angle.v.s.eta_lepton.gif | r1 | manage | 16.0 K | 2007-12-03 - 17:03 | ChengguangZhu | ttbar spin correlation measurement value v.s. lepton eta |
gif | ttbar_spin_correl_angle.v.s.pt_lepton.gif | r1 | manage | 14.2 K | 2007-12-03 - 16:55 | ChengguangZhu | ttbar spin correlation measurement value v.s. lepton pt |
gif | ttcorrelation_A_with_new_corrfun1.gif | r3 r2 r1 | manage | 15.1 K | 2007-12-03 - 17:56 | ChengguangZhu | |
gif | ttcorrelation_A_with_new_corrfun2.gif | r2 r1 | manage | 15.4 K | 2007-12-03 - 15:17 | ChengguangZhu | |
gif | ttcorrelation_A_with_old_corrfun.gif | r1 | manage | 11.2 K | 2007-12-02 - 18:32 | ChengguangZhu | ttbar correlation factor with old efficiency function |
gif | ttcorrelation_Ad_with_new_corrfun1.gif | r2 r1 | manage | 17.9 K | 2007-12-03 - 17:55 | ChengguangZhu | |
gif | ttcorrelation_Ad_with_new_corrfun2.gif | r2 r1 | manage | 18.0 K | 2007-12-03 - 15:19 | ChengguangZhu | |
gif | ttcorrelation_Ad_with_old_corrfun.gif | r1 | manage | 17.4 K | 2007-12-02 - 19:41 | ChengguangZhu |