Results from WZ, Higgs and Top for the Summer Conferences

G. Steinbrück Beaune 19-June-2003 1

Results from WZ, Higgs and Top for the Summer Conferences

Results from WZ, Higgs and Top for the Summer Conferences

Georg Steinbrück

Columbia University, New York

Beaune, June 19, 2003

WZ Higgs Top


EW for the Summer: OverviewEW for the Summer: Overview

Update all Cross sections

W/ZElectrons

W/ZMuons

Combine R (electrons) with CDF

Z’ee

WZ EB:


Z CS (Muon Channel)Z CS (Muon Channel)

1585 Candidates

in 32 pb-1

SpringSummer

Applying Spring analysis to more data (with some improvements)

Main Improvement: Single Muon trigger (todo)

5210 Zcandidates in ~100pb (?)

W will come soon

• More data

• Improved Trigger studies


W/Ze CSW/Ze CS

NZ = 2294 ± 57

QCD background removed by fitting to signal and background

More data (todo)

Main Improvement:

Extending to EC

(|η|<1.1 or 1.5<|η|<2.3)


We eventsWe events

NW = 39998 ± 897

ftrk = 4.4 ± 0.1%

εtrk = 69.2 ± 0.7%

QCD bkg under control in EC


Some very prelim. Numbers W/Z eSome very prelim. Numbers W/Z e

Moriond Extension to eta < 2.3

Trigger eff 98 2 96.9 0.4 (stat)

EM id eff 85.6 1 87.0 1.0 (stat)

Tracking eff 73 2 69.2 0.7 (stat)

Trk fake probability 2.3 1 4.4 0.1 (stat)

W acceptance 25.7 0.4 40.4 0.2 (stat)

Z acceptance 12.7 0.2 29.4 0.2 (stat)

Number of W 27370 898 39998 897

Number of Z 1157 42 2294 57

DY correction 1.7 0.4 1.7 0.4

W tau background 1.5 0.5 1.5 0.5

Luminosity 41.6 4.2 41.6 4.2

CR x BR ( W ) 3054 100 86 2833 64 59

CR x BR ( Z ) 294 11 8 254 6 7

CR * BR (W/Z) 10.37 .51 .29 11.17 .37 .15

Based on 42 pb-1

More soon!


Combining with CDFCombining with CDF

Run1:

• Only combined published analyses with much delay

Now:

• Planning to combine results 1-2 times a year

• Have WZ combination group in place with two reps from D0 and CDF

• For EPS: Combining R(electrons) to set up machinery(based on Moriond analyses with improved

treatment of PDF uncertainties and their correlations)

• More after we have updated CS measurements


TopTop

Cross Section:Cross Section:

- topological+di lepton : improved measurements (stats, opological+di lepton : improved measurements (stats, syst.) syst.)

- With btagging: CSIP and SVT- With btagging: CSIP and SVT

- CS in alljets (topological)?- CS in alljets (topological)?

Mass:Mass:- Run 2 mass (?)- Run 2 mass (?)

- Run 1 mass- Run 1 mass


Top: ID issues Top: ID issues

Huge Statistical UncertaintyHuge Statistical UncertaintyHuge Systematic UncertaintyHuge Systematic Uncertainty

Background too largeBackground too largeEfficiencies too smallEfficiencies too small

Areas to be improvedAreas to be improved- EM ID / Track Matching Fakes, Acceptance- Jets Noise fakes- MET Resolution, NoiseTop group is working on these ID issues.

pb (lumi) 0.8 (syst) (stat) 8.5σ 6.33.5

4.53.6


Top: EM IDTop: EM IDEfficiency Loss :Efficiency Loss :

-Tracking efficiency largely solved with p14Tracking efficiency largely solved with p14-(Not recoverable within p13)(Not recoverable within p13)-Use of EC electrons (15% per electron)Use of EC electrons (15% per electron)

Use of Cracks (20% of the CC electrons) Use of Cracks (20% of the CC electrons)

Large Background :Large Background :

Use LikelihoodUse Likelihood

Understand Module Boundaries!


Top: Jet/METTop: Jet/MET

Fake jets

0< Ntracks<5 Ntracks>5Ntracks= 0

Mean = 11.5 GeVRMS = 14.8 GeV



Re-seeding and Re-seeding and

re-clustering of jets re-clustering of jets

MET: Resolution,Long tails

Reduce noise in calorimeter, use PV


Top: b tag Xsec (CSIP)Top: b tag Xsec (CSIP)

CSIP: counting signed IP algorithm

Moriond data set

Preselection before topological cuts (same for mass)

1 tag required

Blue is bkg excl. top

Top in 3rd and 4th bin

pb (lumi) 0.7 (syst) (stat) 7.3jets)σ(


pb (lumi) 1.1 (syst) (stat) 10.4jets)σ(e

1.61.4

4.43.6

2.72.4

6.04.3

1.81.6

6.95.4

l


Top: b tag Xsec (SVT)Top: b tag Xsec (SVT)

SVT

Under EB review

Hopefully for EPS



pb (lumi) 1.7 (syst) (stat) 16.9jets)σ(e

2.52.0

4.94.1

2.82.4

6.34.4

3.32.8

8.06.4

l


Top: MassTop: Mass

Run 1 Matrix element: l+jets mass (finalized), hopefully W helicity(preliminary) for EPS

Tools in place

To be used on Moriond sample


Higgs: OverviewHiggs: Overview

W(->e)+di-jets, including bbbar

W(->)+di-jets, including bbbar

Z(->ee)+di-jets, including bbbar

Z(->)+di-jets including bbbar (bbar new)

bbh(->bb) new (high tan beta susy mode)

H++/H-- new

h update

H->WW(*)->l+l- (l=e,) update

SM Higgs

Non-SM Higgs


SM HiggsSM Higgs

WH/ZH -> e, + bbbar (?)• continue with shape comparisons

• absolute bkg normalization still open, though work has proceeded

(both W+bb from theory and W+bb/W+jets from theory. Systematic?)

• add b-tagging

status now: have W (+jet) selections. Adding tagging as we speak

• technicolor limits w/physics sensitivity


“Higgs” H->WW->ee, e, “Higgs” H->WW->ee, e, • updated lumi: analysis presentations: >90 pb^-1

•

• selection, MET, dPhi(MET,), M( ) != M(Z)+/-15 GeV, HT < 40 GeV (top veto)

Prediction: Z/* -> 0.9 +- 0.7 (stats only)

heavy flavor/W+jets 0.04 +- 0.04

Z/gamma* ->tautau 0

WW-> 1.06 +- 0.02

tt-> +jets 0.059 +- 0.004

DATA: 2

8*H->WW-> 0.1

• e :

• 30%-80% better efficiency than ICHEP (optimization of cuts)

• blind analysis (dPhi(e,) for 4th generation models, closing in on sensitivity

• also try for WW cross-section (WZ group knows) combine the channels ee, e

4th generation models (larger CS)


HWW HWW

• selection

•MET

• dPhi(MET,mu)

• M() != M(Z)+/-15 GeV

• HT < 40 GeV (top veto)


H-- /H++H-- /H++

>=2 muons

Dphi cut if 2 muons (not for 3)

Models:

a) L-R symmetric models

b) Models with Higgs triplets instead of doublets


H-- /H++H-- /H++

1

2

3

MET=17 GeV

MT=42 GeV


H-- /H++H-- /H++

LEP, CDF~110 GeV

• will definitely be ready

• example of trade-offs between physics and quality:

•Primary analysts got sidetracked to make significant contributions to understanding Z mass width in mumu


Susy Higgs: hbbSusy Higgs: hbb

• with b-tagging improving, we should be in sensitivity region now

• CDF Run1 Trigger eff 10% D0 RunII 50-80%

• for QCD can approximately "predict" two b-tag data (using single tags)

• clean up and tweak (see Haas ADM talk)

• now extend to three b-tags. Have signal MC in hand

Black points: data

Black line: prediction

3 components: QCD, ttbar,Z+jetsbb

Red all but Z

At least 3 jets for trigger and offline

Trigger turnon folded in plots


ConclusionsConclusions EW

W and Z CS in electrons and Muons Combine R with CDF Z’ee

Top CS: topological cuts and di leptons, two b tagging methods Top mass tools in place Run 1 Matrix element method, W helicity(?)

Higgs W/ZH in the e and mu channel, (also with b tagging) bbh(->bb) H++/H-- mumu hgamma gamma H->WW(*)->l+l- (l=e,mu)

Results from WZ, Higgs and Top for the Summer Conferences

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