Higgs to WW Analysis inCDF and ATLAS

R StDenis

Higgs to WW CDF and ATLAS

•Reproduction of Previous Results:Identifying, datasets, Rows and columns•Data Access and Strategy•Standard Candle: Z) •Shining the Light on CDF•Plans for ATLAS

Higgs to WW UpdateReproduction of Note 7708 Results

–The yields of the previous 360pb-1 H->WW->llanalysis have

been reproduced apart from:– some unresolved queries on the Phoenix cuts – the fake estimate is taken as a scaling factor from the old analysis– some unresolved queries on stubless muons– plug data has not been included

–Each cut yield has been reproduced number by number for a Higgs Mass=160GeV

Rows and ColumnsReproduction of Note 7708 Results

Rows: different parts of the detector, separated by cracks:What are the Rows for ATLAS?

Columns: Events surviving each Cut.

LeptonIDLeptonIsolation

Jet VetoMissing Et

Muon Reco. Efficiency as EtaRome (Athena 10.0.4)

And datasets…Reproduction of Note 7708 Results

Dilepton azumuthal separation, ll

# e

vents

/ p

b-1

/ 0.4

(22.5

o)

(To be phased out)

TopNtuple

StNtuple

‘MakeClass’ Based (To be phased out)

Object Based

Validation in

Progress

< >

Full Reco

Data Stream: Et>18

MC: Sig or BkgIe. H->WW

Atlas TagDB will have Trigger

Looking at AvailableAtlas MC DataSets

ObjectSelection Code: e,mu, MET,Jet

DtupleMTuple

Data Flow

Zee

ObjectSelection Code:

E,mu,jet,Met

Dtuple

Hww>llSelection Code, weighting:Cuts: Mll, Isolation

Hww>llSelection Code:

Cuts: METd(L-jet)

Z0)Proves analysis

Z0Bkg

• Object Selection: tricky trigger efficiencies, MC/Data calibration of reconstruciton efficiency

Data Flow – and Strategy

Shining the Light on CDFZ to ll Crossection*BR measurement

–In all channels:CEM-CEM,CEM-PLUG,PLUG-PLUG,CEM-CMU(X),CEM-CMUP, CMU(X)-CMUP (27 types) etc.–Datasets based on trigger: Central Electron >18, Cmu >18, Plug +MET, CMX>18–Good run lists–Trigger Efficiencies (measured from Z0)–Reconstruction Efficiency relative to MC (measured from Z0)

Shining a Candle on CDFZ to ee (tight, central)

*BR: 269.06 ±3.33(stat) ±2.11(sys) ±15.87(lum) Note 7708: *BR: 259.3 ±3.3 (stat) ±5.4 (sys) ±15.4

(lum)

Oops!: applied a correction twice

More Bugs Scurry

Combined CMhUP-CM(UP/X/P/IO)

*BR: 284.3 ±6.63(stat) ±9.87(sys) ±16.8(lum) Note 7708: *BR: 260.9 ±3.5 (stat) ±5.8 (sys)

±15.4 (lum)

Dilepton Invariant mass

#

events

Z to (CMUP)

Oops! Get different trigger efficiencies and MC/Data reconstruction factors

Higgs to WW UpdateCrossections for Z > all combinations

200

220

240

260

280

300

320

Dilepton Type

*B

R

Only statistical errors quoted, queries as to the SF correlation

Higgs to WW UpdateZ > ee, weights

Dilepton Scale Factor error Dilepton trigger efficiency error total weight error

CMUP weights 0.7635 0.0139 0.9915 0.0188 0.7571 0.0347

TCE weights 0.9920 0.0064 0.9987(avg) 0.0077(avg) 0.9907(avg) 0.00995(avg)

HepgZ number MC Z after selection (weighted) Acceptance (weighted) # event # back-ground

TCE 1.53E+06 110409.3416 0.0726263 6899 12

CMUP 1.27E+06 23118.9 0.0182097 1849 0

Higgs to WW UpdateZ Mass for MC all channels

Z M

ass

90.5

90.6

90.7

90.8

90.9

91

91.1

91.2

91.3

Dilepton Type

Higgs to WW UpdateZ Mass for all Data channels

Z M

ass

90.5

90.6

90.7

90.8

90.9

91

91.1

91.2

91.3

Dilepton Type

Higgs to WW UpdateZ > ee, calculation

Estimated using the number of same sign events

Corrects the Z for Z outside the mass window 66-166GeV

Corrects the luminosity due to the luminous region being greater than that over which the luminosity measurement is made

Acceptance is the number of MC events in the mass window after selection over the number of HepgZs in the mass window

For ATLAS

• Identify datasets and try to use Atlas General Ntuple – or fail! But create Dtuple

• Identify the “Rows” for ATLAS dilepton combinations (a few experts would do!)

• Measure Z cross section in Atlas: compute the same Trigger and reco efficiencies as in CDF. How far do we want to get involved in doing the actual studies?

• Go the extra two cuts to get the Z background – and all backgrounds, Higgs to WW.

• Put into an ATLAS Note

Additional Slides

Higgs to WW UpdateReproduction of Note 7708 Results

HWW analysis Event CutsIndex Event Selection cut

1 two leptons with pT l tr igger , non-tr igger >20, 10 GeV

2 Mll >16 Gev

3 nJ ets(ET > 15Gev) = 0 | | nJ ets (ET <55) = 1 | | nJ ets (ET < 40 ) = 2

4 missing ET > MH/ 4

5 MH> 150 | | (ET >50 GeV | | (missing ET , lep/ jet) >0.35

6 opposite lepton charge signs

7 M ll < MH/ 2 - 5GeV

8 ETl1 + ETl2 + missing ET < MH

Higgs to WW UpdateData Access Reorganisation

–Dtuple, an object based small Ntuple has been created for Analysis purposes–The Hww Selection code has been

modified to run from bothTopNtuple and StNtuple

–Correct matching up of StNtuple variables to TopNtuple

variables to be confirmed, along with Validation

Higgs to WW UpdateData Access Reorganisation

–Dtuple, an object based small Ntuple has been created for Analysis purposes–The Hww Selection code has been

modified to run from bothTopNtuple and StNtuple

–Correct matching up of StNtuple variables to TopNtuple

variables to be confirmed, along with Validation

Higgs to WW UpdateZ to ee (tight, central)

Cuts are the same as in ID efficiency Note 7309

Cut Condition

# lepton ==2

EM ET > 20 GeV

EHAD/ EEM < 0.055 + 0.00045 E

L shr < 0.2

Track PT >10 GeV/ c (if EM ET <=100 GeV)

>50/ c GeV (if EM ET > 100 GeV)

E/ p < 2 (if EM ET <=100 GeV)

q. x [-3.0,1.5]cm

| z| < 3cm

2< 10

track | z0| < 60 cm

Track Quality 3 axial and 2 stereo SL

with at least 5 hits out of 12 in each SL

Isolation < 0.1

Fiducial fidele =1 (Ces | X| <21 cm, 9< Ces | Z| <230cm)

(tower 9 excluded, most of tower next to chimney included)

no cosmic or conversion events

Higgs to WW UpdateZ to ll Crossection*BR measurement

–In the channels•Z > two tight central electrons•Z > two CMUP muons

–Both crosschecked using the old Mtuples and new Dtuples created from the original TopNtuples–Gen 5.3.3 zewk6d and zewk6m MC

datasets used–Good run lists 0031(378pb-1) for muon and 1001(374pb-1) for electron data

Higgs to WW UpdateZ to (CMUP)

Cuts are the same as in ID efficiency Notes 3767 and 7956 (JP) apart from the tight cuts are for 3 stereo hits.

Cut Condition

# lepton ==2

Track PT > 20 GeV

track | z0| < 60 cm

EEM <2+Max(0,0.0115(P-100)) GeV

EHAD <6+Max(0,0.028(P-100)) GeV

track | d0| < 0.2cm (if no silicon hits)

< 0.02cm (if silicon hits)

Isol < 0.1

| xCMU | < 3.0 cm

| xCMP | < 5.0cm

Track Quality 3 axial and 2 stereo SL

with at least 5 hits out of 12 in each SL

x-fid(CMP) < 0 cm

z-fid(CMP) < -3 cm

no bluebeam for runs <154449

no cosmic or conversion events

Higgs to WW UpdateOngoing work

–The Joint Physics efficiency Classes have been integrated into the

code in readiness for transition to Gen 6 –Ongoing investigations into finding

better discriminating variables for the HWW event selection–formation of good run lists for 6.1.2

data–Measurement of WW crossection

Higgs to WW UpdateImmediate Goals

–StNtuple Validation & migration–Dtuple Validation & migration–Incorporation of all exisiting data

•Z crossection measurement with new data•WW crossection measurement with new data•Monte Carlo comparison of acceptances for

H>WW using the JP weights•Fake study for 50 GeV jets

–Study the effects of high luminosity on all above

Higgs to WW Update

Future Goals

–Neural Net Analysis

–Vector Boson Fusion Analysis