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

2.  Using New Medium+iso+Blayer Electron ID study presented by Jochen Hartert and Elina Berglund: https://indico.cern.ch/getFile.py/access?contribId=2&resId=0&materialId=slides&confId=117359 https://indico.cern.ch/getFile.py/access?contribId=3&resId=0&materialId=slides&confId=117359  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: (etcone20_pt_corrected<4GeV, not in d3pd, need to be re-calculated) https://svnweb.cern.ch/trac/atlasusr/export/30076/mfiascar/WjetsD3PDskimming/tru nk/IsoCorrection.h https://svnweb.cern.ch/trac/atlasusr/export/30076/mfiascar/WjetsD3PDskimming/tru nk/IsoCorrection.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 MCP release 16 smearing recommendation: https://twiki.cern.ch/twiki/bin/view/AtlasProtected/MCPAnalysisGuidelinesRel16#Ancho rResolutions https://twiki.cern.ch/twiki/bin/view/AtlasProtected/MCPAnalysisGuidelinesRel16#Ancho rResolutions  PileUp reweighting for mc10? Not yet, currently using non-pileup MC.  Different reweighting for e and µ, need to be discussed  Running on bunch train pile-up samples also, not yet finnished https://twiki.cern.ch/twiki/bin/view/AtlasProtected/WZGroupInclusiveMeasurement

3.  OffsetEtaJES correction required for both data and MC suggested by Jet experts:  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 bug. (Mainly in forward region)  EtaOriginEM, PhiOriginEM, MOriginEM yield 0 in current MC samples, should refer to the latest jet user’s guide

4. 7 new candidates spotted

5. 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

9. eeeµµµAll ch TMTMTMTM Data 1251122815 WW→ll 0.020.030.07 0.91 1.001.01 DiBoson 2.0E-34.1E-37.0E-38.6E-30.06 0.070.08 Top 0.220.430.46 0.02 0.700.90 Wjets 0.0.080. 0.08 Zjets 0. DrellYan (No low mass) 0. WW→l+tau 0.2.0E-43.0E-34.3E-30.06 0.07 JF17 0. Some problematical issues out that needs to be resolved which has led to extremely low eff especially for WW→ll signal samples. Cross-check with Harvard group on-going… s/b ratio roughly suppressed, needs more investigation…

10. eeeµµµAll ch TMTMTMTM Data 1251122815 WW→ll 0.841.275.136.151.84 7.809.26 DiBoson 0.070.650.512.490.14 0.720.81 Top 0.220.400.440.620.24 0.901.26 Wjets 0.4.370.889.050. 0.8813.42 Zjets 0. 2.260. 2.26 DrellYan (No low mass) 0. WW→l+tau 0.050.080.450.580.15 0.650.81 JF17 0.

14.  Some problematic issues for WW analysis on mc10 have been more or less resolved and corrected  DY & di-jet samples not fully processed  Working on Bunch Train Pile-Up MC10 samples  First impression of dramatic background enriching due to the medium+iso+Blayer for Electron ID mainly from other DiBosons and Top, more intensive study needed to be done as soon as possible  Acurate estimation needs to be done using data- driven(Wjets background for example)  Event selection cross-check is still on-going as well as optimizing new selection