Higgs to WW Analysis in CDF 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 Update Reproduction of Note 7708 Results –The yields of the previous 360pb -1 H->WW->l l  analysis 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 Columns Reproduction of Note 7708 Results Rows: different parts of the detector, separated by cracks: What are the Rows for ATLAS? Columns: Events surviving each Cut. LeptonID LeptonIsolation Jet Veto Missing Et

Muon Reco. Efficiency as Eta Rome (Athena )

And datasets… Reproduction of Note 7708 Results Dilepton azumuthal separation,  ll # events / pb -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 Bkg Ie. H->WW Atlas TagDB will have Trigger Looking at Available Atlas MC DataSets Object  Selection Code: e,mu, MET,Jet DtupleMTuple Data Flow

Z  ee Object  Selection Code: E,mu,jet,Met Dtuple Hww>l l  Selection Code, weighting: Cuts: M ll, Isolation Hww>l l  Selection Code: Cuts: METd  (L-jet)  Z 0 ) Proves analysis Z 0 Bkg Object Selection: tricky trigger efficiencies, MC/Data calibration of reconstruciton efficiency Data Flow – and Strategy

Shining the Light on CDF Z 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 CDF Z to ee (tight, central)  *BR: ±3.33 (stat) ±2.11 (sys) ±15.87 (lum) Note 7708:  *BR: ±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: ±6.63 (stat) ±9.87 (sys) ±16.8 (lum) Note 7708:  *BR: ±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 Update Crossections for Z > all combinations Dilepton Type  *BR Only statistical errors quoted, queries as to the SF correlation

Higgs to WW Update Z > ee,  weights

Higgs to WW Update Z Mass for MC all channels Z Mass Dilepton Type

Higgs to WW Update Z Mass for all Data channels Z Mass Dilepton Type

Higgs to WW Update Z > ee,  calculation Estimated using the number of same sign events Corrects the Z  for Z outside the mass window GeV 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 Update Reproduction of Note 7708 Results HWW analysis Event Cuts

Higgs to WW Update Data Access Reorganisation –Dtuple, an object based small Ntuple has been created for Analysis purposes –The Hww Selection code has been modified to run from both TopNtuple and StNtuple –Correct matching up of StNtuple variables to TopNtuple variables to be confirmed, along with Validation

Higgs to WW Update Data Access Reorganisation –Dtuple, an object based small Ntuple has been created for Analysis purposes –The Hww Selection code has been modified to run from both TopNtuple and StNtuple –Correct matching up of StNtuple variables to TopNtuple variables to be confirmed, along with Validation

Higgs to WW Update Z to ee (tight, central) Cuts are the same as in ID efficiency Note 7309

Higgs to WW Update Z 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 zewk6d and zewk6m MC datasets used –Good run lists 0031 (378pb -1 ) for muon and 1001 (374pb -1 ) for electron data

Higgs to WW Update Z 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.

Higgs to WW Update Ongoing 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 data –Measurement of WW crossection

Higgs to WW Update Immediate 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