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WW event selection with new Electron ID in 2011 data. 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. NEWS FOR 2011 ANALYSIS.

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ww event selection with new electron id in 2011 data

WW event selection with new Electron ID in 2011 data

S. Li1,2, Y. Liu1

E. Monnier2, Z. Zhao1

Center of Particle Physics and Technology,

University of Science and Technology of China1

& Centre de Physique des Particules de Marseille,

CNRS/IN2P32

news for 2011 analysis
NEWS FOR 2011 ANALYSIS
  • No need to apply Electron Energy rescale for 2011 data (Rel 16.6):
  • https://twiki.cern.ch/twiki/bin/view/AtlasProtected/EnergyScaleResolutionRecommendations#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/JetETMiss/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/BaslinecutsforWWatPLHC
new events in 2011 data by ww baseline selection
New Events in 2011 data by WW baseline selection
  • 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
slide4
WW selection on 2010 reprocessed data and MC10 with bunch train pile-up: new caloIso (caloIso98), reweight NOT applied
slide5
WW selection on 2010 reprocessed data and MC10 with bunch train pile-up: Medium++ + old Isolation(etcone30<6GeV)
slide6
WW selection on 2010 reprocessed data and MC10 with bunch train pile-up: Medium++ + new caloIso (caloIso98)
slide7
ee channel: METrel (2010, 35.2pb-1)

Medium++ + Iso

tight

Medium + Iso + BLAyer

ee channel di lepton pt 2010 35 2pb 1
ee channel: Di-lepton pT (2010, 35.2pb-1)

Medium++ + Iso

tight

Medium + Iso + BLAyer

ee channel di lepton inv mass 2010 35 2pb 1
ee channel: Di-lepton inv. mass (2010, 35.2pb-1)

Medium++ + Iso

tight

Medium + Iso + BLAyer

e channel metrel 2010 35 2pb 1
eµ channel: METrel (2010, 35.2pb-1)

Medium++ + Iso

tight

Medium + Iso + BLAyer

e channel di lepton pt 2010 35 2pb 1
eµ channel: Di-lepton pT (2010, 35.2pb-1)

Medium++ + Iso

tight

Medium + Iso + BLAyer

e channel di lepton inv mass 2010 35 2pb 1
eµ channel: Di-lepton inv. mass (2010, 35.2pb-1)

Medium++ + Iso

Medium + Iso + BLAyer

tight

slide28
ee channel: METrel

tight

Medium + Iso + BLAyer

11.6pb-1

tight

Medium + Iso + BLAyer

35.2pb-1

ee channel di lepton pt
ee channel: Di-lepton pT

tight

Medium + Iso + BLAyer

11.6pb-1

tight

Medium + Iso + BLAyer

35.2pb-1

ee channel di lepton inv mass
ee channel: Di-lepton inv. mass

tight

Medium + Iso + BLAyer

11.6pb-1

tight

Medium + Iso + BLAyer

35.2pb-1

e channel metrel
eµ channel: METrel

tight

Medium + Iso + BLAyer

11.6pb-1

tight

Medium + Iso + BLAyer

35.2pb-1

e channel di lepton pt
eµ channel: Di-lepton pT

Medium + Iso + BLAyer

tight

11.6pb-1

tight

Medium + Iso + BLAyer

35.2pb-1

e channel di lepton inv mass
eµ channel: Di-lepton inv. mass

tight

Medium + Iso + BLAyer

11.6pb-1

tight

Medium + Iso + BLAyer

35.2pb-1

summary and future work
Summary and Future work
  • 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.)
channel metrel
µµ channel: METrel

Medium + Iso + BLAyer

tight

11.6pb-1

tight

Medium + Iso + BLAyer

35.2pb-1

channel di lepton pt
µµ channel: Di-lepton pT

tight

Medium + Iso + BLAyer

11.6pb-1

tight

Medium + Iso + BLAyer

35.2pb-1

channel di lepton inv mass
µµ channel: Di-lepton inv. mass

tight

Medium + Iso + BLAyer

11.6pb-1

tight

Medium + Iso + BLAyer

35.2pb-1

status
Status
  • 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/IsoCorrection.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/egammaIsolationMVATopToolDefs.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.
  • Different reweighting for e and µ, need to be discussed (mainly due to period difference)
  • Tested w/ and w/o rel15 reweighting, no dramatic impact!
  • Running on bunch train pile-up samples also, not yet finished
  • https://twiki.cern.ch/twiki/bin/view/AtlasProtected/WZGroupInclusiveMeasurement
some words about jet selection in rel 16
Some words about Jet selection in Rel.16
  • OffsetEtaJES correction required for both data and MC suggested by Jet experts:

(Toshi Sumida & CaterinaDoglioni)

  • https://svnweb.cern.ch/trac/atlasgrp/browser/CombPerf/JetETMiss/JetUserGuide/tags/JetUserGuide-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/Etmisstwikiis obsolete!)
jet multiplicities from data w tight w medium electron id
Jet Multiplicities from data w/ tight w/medium Electron ID

7 new candidates spotted w/ old Iso,

2 disappeared w/ new caloIso98

interesting new candidates
Interesting New Candidates

Yellow: killed with NEW caloIso98 Electron ID!

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