Status of e

1
Status of eµ low-pT trileptons

• Melisa Rossi
• Udine University

2
Outline

• Data and MC
• Lepton Selection
• First Step goodness of our tools
• Cross check with Johns Dielectron Control
  Regions
• Z window
• Outside Z window
• Conclusions - Next

3
Data and MC

• Data
• SUSY dilepton dataset edil0d
• Good run list v7 no silicon
• 346 pb-1 up to August 2004
• 224pb-1 up to Februaty 2004
• DIELECTRON_CENTRAL_4 (CES2/3)
• trigger efficiency from CDF7095
• MC
• DY sexo8t (Z ?ll, Inv massgt5GeV/c2)
• K-factor 1.34 (Johns measurement)

4
Lepton Selection
ET 4 GeV Fid 1 Z0 60cm Had/Em
0.0550.00045Eem E/p 2 or pTgt50 GeV/c Lshr
0.2 ?2strip 10 -3cm Q?X 1.5 cm ?Z 3
cm NCotAx(5)3, NCotSt(5) 2 IsoFraction 0.1

• ID CEM selection
• Remove conversions
• Sxylt0.2, ?cot?lt0.04
• Dilepton selection
• 1st electron ETgt10 GeV
• 2nd electron ETgt5 GeV
• ?Rgt0.4 between electrons
• and electron-jet
• ID Scale Factors

SF ET CDF note 1.00
4-8GeV 7379 1.03 8-20GeV 7233 0.996
gt20GeV 7309
5
Dilepton Control Regions

• CR1 Z window
• 76 Mee 106 GeV/c2
• CR2 outside Z (diluted signal box)
• METgt15 GeV
• 15 lt Meelt 76 and Meegt 106 GeV/c2

6
CR1 Z window for 224pb-1

• 35 difference with John
• ?2strip Problem

Data DY
Me 1985 213010stat
John 3070 3091137statsys
CDF7309
7
CR1 Z window for 224pb-1
Removing ?2strip cut, 15 difference with John
Data DY
3542 350713stat
3070 3091137statsys
8
CR1 Z window for 224pb-1
9
CR2 outside Z for 224pb-1
Removing ?2strip cut, 15 difference with John
Data DY
125 1243stat
105 1066statsys
10
CR2 outside Z for 224pb-1
11
Mee spectrum for 224pb-1
12
CR1-CR2 for 346pb-1
Data DY
CR1 5213 541620stat
CR2 186 1934stat
13
Mee spectrum for 346pb-1
14
Conclusions and Next

• Data and DY MC are consistent
• Understand
• ?2strip variable
• 15 difference with John
• Add all MC samples
• Move to the eµ channel
• Fake estimation
• Much more ...