1. S. Li 1,2, Y. Liu 1 E. Monnier 2, Z. Zhao 1 Center of Particle Physics and Technology, University of Science and Technology of China 1 & Centre de Physique des Particules de Marseille, CNRS/IN2P3 2 1

2.  No need to apply Electron Energy rescale for 2011 data (Rel 16.6):  https://twiki.cern.ch/twiki/bin/view/AtlasProtected/Energ yScaleResolutionRecommendations#2011_data_Release_16 _6 https://twiki.cern.ch/twiki/bin/view/AtlasProtected/Energ yScaleResolutionRecommendations#2011_data_Release_16 _6  No need to apply Jet OffsetEtaJES correction for 2011 data if >16.6.1 release, no new JetUserGuide available. Jet_*OriginEM yielding 0 value for both 2011 data and mc10, need consulting the latest MC10 approximation in the latest JetUserGuide version:  https://svnweb.cern.ch/trac/atlasgrp/browser/CombPerf/J etETMiss/JetUserGuide/tags/JetUserGuide-00-01- 01/AtlasJetUserGuide.pdf https://svnweb.cern.ch/trac/atlasgrp/browser/CombPerf/J etETMiss/JetUserGuide/tags/JetUserGuide-00-01- 01/AtlasJetUserGuide.pdf  New WW baseline heading for pLHC using 2011 data only:  https://twiki.cern.ch/twiki/bin/view/AtlasProtected/Baslin ecutsforWWatPLHC https://twiki.cern.ch/twiki/bin/view/AtlasProtected/Baslin ecutsforWWatPLHC 2

3.  Both tight and medium+iso+Blayer electron ID spotted the same 9 events in black  Green colored: events came up when increasing the jet pt threshold for tight  Yellow colored: events came up when increasing the jet pt threshold for medium 3 chRun Number Event Number LBMETrel /GeV pT(ll) /GeV Inv.M(ll) /GeV ee1780443169653133544.619.0254.9 eµ1780442655814429276.371.695.3 eµ178044740934714371.053.717.5 eµ1781095753441466422.430.094.5 µµ1780441071888717043.2 (MET=52.5) 6.775.9 µµ1780441079668317153.852.180.1 µµ1780444648827947775.869.8104.1 µµ1781095713821365951.063.578.8 µµ1781096658494576566.272.744.9 eµ1781095849840967425.2 (MET=30.9) 12.853.8 µµ17810948377288566 117.5 122.231.9 eµ17804434058470357 43.6 35.079.2 eµ17810969695548801 48.2 27.246.3

4. eeeµµµAll ch TMTMTMTM Data 125922813 WW→ll 0.841.224.815.741.84 7.49± 0.06 8.80± 0.07 DiBoson 0.040.430.502.100.12 0.65± 0.05 2.64± 0.17 Top 0.110.160.430.540.15 0.69± 0.05 0.85± 0.05 Wjets 0.1.590.176.300.09 0.26± 0.15 7.97±0.95 Zjets 0. 0.681.450.09 0.77±0.27 1.54± 0.39 DrellYan 0. WW→l+tau 0.050.080.430.560.13 0.61± 0.01 0.77± 0.02 JF17 0. 4

5. eeeµµµAll ch TMTMTMTM Data 11562289 WW→ll 0.840.894.814.901.84 7.49± 0.06 7.64± 0.06 DiBoson 0.040.060.500.600.12 0.65± 0.05 0.78± 0.07 Top 0.110.120.43 0.15 0.69± 0.05 0.70± 0.05 Wjets 0. 0.170.640.09 0.26± 0.15 0.73± 0.30 Zjets 0. 0.68 0.09 0.77± 0.27 0.77± 0.27 DrellYan 0. WW→l+tau 0.05 0.430.450.13 0.61± 0.01 0.63± 0.02 JF17 0. 5

6. eeeµµµAll ch TMTMTMTM Data 11552288 WW→ll 0.840.914.814.931.84 7.49± 0.06 7.67± 0.06 DiBoson 0.040.070.500.630.12 0.65± 0.05 0.81± 0.07 Top 0.110.140.430.450.15 0.69± 0.05 0.73± 0.05 Wjets 0. 0.170.730.09 0.26± 0.15 0.81± 0.31 Zjets 0. 0.68 0.09 0.77± 0.27 0.77± 0.27 DrellYan 0. WW→l+tau 0.050.060.430.450.13 0.61± 0.01 0.64± 0.02 JF17 0. 6

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17. Sample fake factor Electron Tight ID Medium+ Iso+ Bayer Medium++ +new iso Medium++ +old iso Data0.0320.3640.0550.035 JF170.0160.2250.0260.017 Data with MC subtraction 0.0230.3430.0410.026 17 Elec ID Channel s WW Events (1fakeable +1ID) WW Events (1fakeable +1ID) With MC subtracted WW Events ( 2ID leptons) Expected Wjets backgroun d Tight ee65.0310.12 eµeµ2418.0850.41 Medium+ Iso + Bayer ee32.6420.91 eµeµ1310.6493.65 Medium++ +new iso ee32.1910.09 eµeµ137.5250.31 Medium++ +old iso ee54.1110.11 eµeµ2317.3260.46

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35.  All with bunch train pile-up MC10 samples with no reweighting applied  An impression of dramatic background enriching due to the medium+iso+Blayer for Electron ID mainly from Wjets, more intensive study needed to be done as soon as possible(Medium++? Need to be cross- checked with John Alison)  Accurate estimation needs to be done using data-driven(Wjets, DY background etc.) 35

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39.  Using New Medium+iso+Blayer Electron ID study presented by Jochen Hartert: https://indico.cern.ch/getFile.py/access?contribId=1&resId=0&materialId=slides&confId=117360  New Electron ID selection introduced recently(not optimized): egammaPID::ElectronMedium_WithTrackMatch (*Note that: el_loose, el_medium, el_tight available for 2011 egamma D3PD) New Electron Isolation correction applied: (OLD: etcone20_pt_corrected<4GeV, not in d3pd, need to be re-calculated) https://svnweb.cern.ch/trac/atlasusr/export/30076/mfiascar/WjetsD3PDskimming/trunk/IsoCorrectio n.h https://svnweb.cern.ch/trac/atlasusr/export/30076/mfiascar/WjetsD3PDskimming/trunk/IsoCorrectio n.h (NEW: caloIso98, using dedicated el_isIso mask (based on etcone30/ET, bin-by-bin tuned, flatter efficiency, better QCD rejection power) http://alxr.usatlas.bnl.gov/lxr- stb5/source/atlas/Reconstruction/egamma/egammaInterfaces/egammaInterfaces/egammaIsolationMVATopToo lDefs.h http://alxr.usatlas.bnl.gov/lxr- stb5/source/atlas/Reconstruction/egamma/egammaInterfaces/egammaInterfaces/egammaIsolationMVATopToo lDefs.h egammaPID::TrackBlayer_Electron as Blayer requirement instead of simply NBLHits>0 if any hits are expected  Electron/Muon MC10 smearing applied(Job Running, ~100 MC samples!) Using the same random seeding policy for electron and muon: Rndm_seed = 680049+EventNumber+index*100 Using ERescaler Tool for Electron smearing and refer to MCP release 16 smearing recommendation: https://twiki.cern.ch/twiki/bin/view/AtlasProtected/MCPAnalysisGuidelinesRel16#AnchorResolutions  PileUp reweighting for mc10? Not yet, currently using non-pileup MC. o Different reweighting for e and µ, need to be discussed (mainly due to period difference) o Tested w/ and w/o rel15 reweighting, no dramatic impact! o Running on bunch train pile-up samples also, not yet finished https://twiki.cern.ch/twiki/bin/view/AtlasProtected/WZGroupInclusiveMeasurement 39

40.  OffsetEtaJES correction required for both data and MC suggested by Jet experts: (Toshi Sumida & Caterina Doglioni)  https://svnweb.cern.ch/trac/atlasgrp/browser/C ombPerf/JetETMiss/JetUserGuide/tags/JetUserGui de-00-01-01/AtlasJetUserGuide.pdf https://svnweb.cern.ch/trac/atlasgrp/browser/C ombPerf/JetETMiss/JetUserGuide/tags/JetUserGui de-00-01-01/AtlasJetUserGuide.pdf  Not optimal especially for bunch train pile-up MC  Negative Energy *full scaled* jets need to be cleaned due to a D3PDmaker level bug. (Mainly in forward region?)  EtaOriginEM, PhiOriginEM, MOriginEM mostly(?) yield 0 in current MC samples as well as in 2011 data(?), should refer to the latest ATLAS Jet User guide so as to approximately recover them(the one on Jet/Etmiss twiki is obsolete!) 40

41. 7 new candidates spotted w/ old Iso, 2 disappeared w/ new caloIso98 41

42. chRunNum ber EventNu mber LBMETrel /GeV pT(ll) /GeV Inv.M(ll) /GeV ee165732331138 49 18240.337.133.8 eµ161948337307 28 58759.157.137.4 eµ166924302103 10 14961.562.554.8 eµ167607647864 13 26020.517.985.8 eµ167607703659 57 27562.446.136.9 eµ167607126511 969 42356.249.947.1 eµ167680325781 07 12036.345.5156.2 42 Yellow: killed with NEW caloIso98 Electron ID!

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46. eeeµµµAll ch TMTMTMTM Data 12511228±2.8315± 3.87 WW→ll 0.841.275.136.151.84 7.80±0.10 9.26±0.11 DiBoson 0.070.650.512.490.14 0.72±0.08 3.28±0.32 Top 0.220.400.440.620.24 0.90±0.17 1.26±0.20 Wjets 0.4.370.889.050. 0.88±0.88 13.42± 3.79 Zjets 0. 2.260. 2.26±1.42 DrellYan 0. WW→l+tau 0.050.080.450.580.15 0.65±0.03 0.81±0.03 JF17 0. 46

47. eeeµµµAll ch TMTMTMTM Data 1259228±2.8313± 3.61 WW→ll 0.841.265.136.121.84 7.80± 0.10 9.22± 0.11 DiBoson 0.070.650.512.530.14 0.72± 0.08 3.31± 0.32 Top 0.220.380.440.610.24 0.90± 0.17 1.23± 0.20 Wjets 0.3.500.888.170. 0.88± 0.88 11.67± 3.58 Zjets 0. 2.260. 2.26± 1.42 DrellYan 0. WW→l+tau 0.050.080.450.590.15 0.65± 0.03 0.82± 0.03 JF17 0. 47