1

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

2

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

NEWS FOR 2011 ANALYSIS

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

New Events in 2011 data by WW baseline selection

ch RunNumber

EventNumber

LB METrel/GeV

pT(ll)/GeV

Inv.M(ll)/GeV

ee 178044 31696531 335 44.6 19.0 254.9

eµ 178044 26558144 292 76.3 71.6 95.3

eµ 178044 7409347 143 71.0 53.7 17.5

eµ 178109 57534414 664 22.4 30.0 94.5

µµ 178044 10718887 170 43.2(MET=52.5)

6.7 75.9

µµ 178044 10796683 171 53.8 52.1 80.1

µµ 178044 46488279 477 75.8 69.8 104.1

µµ 178109 57138213 659 51.0 63.5 78.8

µµ 178109 66584945 765 66.2 72.7 44.9

eµ 178109 58498409 674 25.2(MET=30.9)

12.8 53.8

µµ 178109 48377288 566 117.5 122.2 31.9

eµ 178044 34058470 357 43.6 35.0 79.2

eµ 178109 69695548 801 48.2 27.2 46.3

4

ee eµ µµ All ch

T M T M T M T M

Data 1 2 5 9 2 2 8 13

WW→ll 0.84 1.22 4.81 5.74 1.84 1.84 7.49±0.06

8.80±0.07

DiBoson 0.04 0.43 0.50 2.10 0.12 0.12 0.65±0.05

2.64±0.17

Top 0.11 0.16 0.43 0.54 0.15 0.15 0.69±0.05

0.85±0.05

Wjets 0. 1.59 0.17 6.30 0.09 0.09 0.26±0.15

7.97±0.95

Zjets 0. 0. 0.68 1.45 0.09 0.09 0.77±0.27

1.54±0.39

DrellYan 0. 0. 0. 0. 0. 0. 0. 0.

WW→l+tau 0.05 0.08 0.43 0.56 0.13 0.13 0.61±0.01

0.77±0.02

JF17 0. 0. 0. 0. 0. 0. 0. 0.

WW selection on 2010 reprocessed data and MC10 with bunch train pile-up: new caloIso (caloIso98), reweight NOT applied

5

ee eµ µµ All ch

T M T M T M T M

Data 1 1 5 6 2 2 8 9

WW→ll 0.84 0.89 4.81 4.90 1.84 1.84 7.49±0.06

7.64±0.06

DiBoson 0.04 0.06 0.50 0.60 0.12 0.12 0.65±0.05

0.78±0.07

Top 0.11 0.12 0.43 0.43 0.15 0.15 0.69±0.05

0.70±0.05

Wjets 0. 0. 0.17 0.64 0.09 0.09 0.26±0.15

0.73±0.30

Zjets 0. 0. 0.68 0.68 0.09 0.09 0.77±0.27

0.77±0.27

DrellYan 0. 0. 0. 0. 0. 0. 0. 0.

WW→l+tau 0.05 0.05 0.43 0.45 0.13 0.13 0.61±0.01

0.63±0.02

JF17 0. 0. 0. 0. 0. 0. 0. 0.

WW selection on 2010 reprocessed data and MC10 with bunch train pile-up: Medium++ + old Isolation(etcone30<6GeV)

6

ee eµ µµ All ch

T M T M T M T M

Data 1 1 5 5 2 2 8 8

WW→ll 0.84 0.91 4.81 4.93 1.84 1.84 7.49±0.06

7.67±0.06

DiBoson 0.04 0.07 0.50 0.63 0.12 0.12 0.65±0.05

0.81±0.07

Top 0.11 0.14 0.43 0.45 0.15 0.15 0.69±0.05

0.73±0.05

Wjets 0. 0. 0.17 0.73 0.09 0.09 0.26±0.15

0.81±0.31

Zjets 0. 0. 0.68 0.68 0.09 0.09 0.77±0.27

0.77±0.27

DrellYan 0. 0. 0. 0. 0. 0. 0. 0.

WW→l+tau 0.05 0.06 0.43 0.45 0.13 0.13 0.61±0.01

0.64±0.02

JF17 0. 0. 0. 0. 0. 0. 0. 0.

WW selection on 2010 reprocessed data and MC10 with bunch train pile-up: Medium++ + new caloIso (caloIso98)

7

ee channel: METrel (2010, 35.2pb-1)MEDIUM++ + ISO

TIGHT MEDIUM + ISO + BLAYER

8

ee channel: Di-lepton pT (2010, 35.2pb-

1)

TIGHT MEDIUM + ISO + BLAYER

MEDIUM++ + ISO

9

ee channel: Di-lepton inv. mass (2010, 35.2pb-

1)

TIGHT MEDIUM + ISO + BLAYER

MEDIUM++ + ISO

10

eµ channel: METrel (2010, 35.2pb-1)

TIGHT MEDIUM + ISO + BLAYER

MEDIUM++ + ISO

11

eµ channel: Di-lepton pT (2010, 35.2pb-

1)

TIGHT MEDIUM + ISO + BLAYER

MEDIUM++ + ISO

12

eµ channel: Di-lepton inv. mass (2010, 35.2pb-

1)

TIGHTMEDIUM + ISO

+ BLAYER

MEDIUM++ + ISO

13

Pile-Up effects in 2011 data:Using Zmumu sample (Without JES correction)

20102011

14

Pile-Up effects in 2011 data:Using Zmumu sample (With JES correction)

20102011

15

Jet Multiplicities w.r.t. various NVtx bin:2010 normalized to 2011(Without JES correction)

16

Jet Multiplicities w.r.t. various NVtx bin:2010 normalized to 2011(With JES correction)

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Sample fake factor

Electron Tight ID

Medium+ Iso+ Bayer

Medium+++new iso

Medium+++old iso

Data 0.032 0.364 0.055 0.035

JF17 0.016 0.225 0.026 0.017Data with MC subtraction

0.023 0.343 0.041 0.026

Data-driven Wjets background estimation: fake factor estimation

ElecID

Channels

WW Events

(1fakeable +1ID)

WW Events

(1fakeable +1ID)With MC

subtracted

WW Events

(2ID leptons)

Expected Wjets

background

Tightee 6 5.03 1 0.12

eµ 24 18.08 5 0.41

Medium+ Iso + Bayer

ee 3 2.64 2 0.91

eµ 13 10.64 9 3.65

Medium+++new iso

ee 3 2.19 1 0.09

eµ 13 7.52 5 0.31

Medium+++old iso

ee 5 4.11 1 0.11

eµ 23 17.32 6 0.46

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Electron Tight ID: FakeRate pT dependence

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Electron Tight ID: FakeRate MET dependence

20

Electron Medium+iso+BLayer ID: FakeRate pT dependence

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Electron Medium+iso+BLayer ID: FakeRate MET dependence

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Electron Medium++ ID(with new isolation): FakeRate pT dependence

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Electron Medium++ ID(with new isolation): FakeRate MET dependence

Electron Medium++ ID(with old isolation): FakeRate pT dependence

Electron Medium++ ID(with old isolation): FakeRate MET dependence

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WW selection exercise in 2011 data:Jet Multiplicities

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WW selection exercise in 2011 data:Jet Multiplicities(with 30GeV pT Threshold)

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ee channel: METrelTIGHT MEDIUM + ISO

+ BLAYER

11.6PB-1

35.2PB-1

TIGHT MEDIUM + ISO + BLAYER

29

ee channel: Di-lepton pT

TIGHT MEDIUM + ISO + BLAYER

11.6PB-1

35.2PB-1

TIGHT MEDIUM + ISO + BLAYER

30

ee channel: Di-lepton inv. mass

TIGHT MEDIUM + ISO + BLAYER

11.6PB-1

35.2PB-1

TIGHT MEDIUM + ISO + BLAYER

31

eµ channel: METrel

TIGHT MEDIUM + ISO + BLAYER

11.6PB-1

35.2PB-1

TIGHT MEDIUM + ISO + BLAYER

32

eµ channel: Di-lepton pT

TIGHTMEDIUM + ISO

+ BLAYER

11.6PB-1

35.2PB-1

TIGHT MEDIUM + ISO + BLAYER

33

Spare

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eµ channel: Di-lepton inv. mass

TIGHT MEDIUM + ISO + BLAYER

11.6PB-1

35.2PB-1

TIGHT MEDIUM + ISO + BLAYER

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.)

Summary and Future work

36

µµ channel: METrel

TIGHTMEDIUM + ISO

+ BLAYER

11.6PB-1

35.2PB-1

TIGHT MEDIUM + ISO + BLAYER

37

µµ channel: Di-lepton pT

TIGHT MEDIUM + ISO + BLAYER

11.6PB-1

35.2PB-1

TIGHT MEDIUM + ISO + BLAYER

38

µµ channel: Di-lepton inv. massTIGHT MEDIUM + ISO

+ BLAYER

11.6PB-1

35.2PB-1

TIGHT MEDIUM + ISO + BLAYER

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

(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.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

Status

40

OffsetEtaJES correction required for both data and MC suggested by Jet experts:(Toshi Sumida & Caterina Doglioni)

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/Etmiss twiki is obsolete!)

Some words about Jet selection in Rel.16

41

Jet Multiplicities from data w/ tight w/medium Electron ID

7 new candidates spotted w/ old Iso, 2 disappeared w/

new caloIso98

42

ch RunNumber

EventNumber

LB METrel/GeV

pT(ll)/GeV

Inv.M(ll)

/GeV

ee 165732 33113849

182 40.3 37.1 33.8

eµ 161948 33730728

587 59.1 57.1 37.4

eµ 166924 30210310

149 61.5 62.5 54.8

eµ 167607 64786413

260 20.5 17.9 85.8

eµ 167607 70365957

275 62.4 46.1 36.9

eµ 167607 126511969

423 56.2 49.9 47.1

eµ 167680 32578107

120 36.3 45.5 156.2

Interesting New Candidates

Yellow: killed with NEW caloIso98 Electron ID!

43

MET_rel distribution w/ tight and w/medium+new iso+blayer Electron ID

44

pT(ll) distribution w/ tight and w/medium+new iso+blayer Electron ID

45

Inv.M(ll) distribution w/ tight and w/medium+new iso+blayer Electron ID

46

ee eµ µµ All ch

T M T M T M T M

Data 1 2 5 11 2 2 8±2.83 15±3.87

WW→ll 0.84 1.27 5.13 6.15 1.84 1.84 7.80±0.10

9.26±0.11

DiBoson 0.07 0.65 0.51 2.49 0.14 0.14 0.72±0.08

3.28±0.32

Top 0.22 0.40 0.44 0.62 0.24 0.24 0.90±0.17

1.26±0.20

Wjets 0. 4.37 0.88 9.05 0. 0. 0.88±0.88

13.42±3.79

Zjets 0. 0. 0. 2.26 0. 0. 0. 2.26±1.42

DrellYan 0. 0. 0. 0. 0. 0. 0. 0.

WW→l+tau 0.05 0.08 0.45 0.58 0.15 0.15 0.65±0.03

0.81±0.03

JF17 0. 0. 0. 0. 0. 0. 0. 0.

Some preliminary results from MC10:with OLD caloIso (etcone20_pt_corrected)

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ee eµ µµ All ch

T M T M T M T M

Data 1 2 5 9 2 2 8±2.83 13±3.61

WW→ll 0.84 1.26 5.13 6.12 1.84 1.84 7.80±0.10

9.22±0.11

DiBoson 0.07 0.65 0.51 2.53 0.14 0.14 0.72±0.08

3.31±0.32

Top 0.22 0.38 0.44 0.61 0.24 0.24 0.90±0.17

1.23±0.20

Wjets 0. 3.50 0.88 8.17 0. 0. 0.88±0.88

11.67±3.58

Zjets 0. 0. 0. 2.26 0. 0. 0. 2.26±1.42

DrellYan 0. 0. 0. 0. 0. 0. 0. 0.

WW→l+tau 0.05 0.08 0.45 0.59 0.15 0.15 0.65±0.03

0.82±0.03

JF17 0. 0. 0. 0. 0. 0. 0. 0.

Some preliminary results from MC10:with new caloIso (caloIso98)