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Unified Search for Associated Production of Chargino-Neutralino using Leptons
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We present a search for the associated production of chargino and neutralino supersymmetric
particles using data collected by the CDF II experiment at the Tevatron. We analyze events
with three charged leptons and momentum imbalance, in five exclusive channels. We observe no
excess over standard model expectation. We present upper limits on the production cross section
in the mSUGRA model.
Blessed Plots : Control Regions
Control Regions (DILEPTON)
The figure illustrates our control regions for dilepton selection.
Control regions are defined according to the dilepton invariant mass and momentum imbalance
(missing energy or MET) in the detector. The control region names are defined as follows
Z : Zee, dilepton invariant mass is 76<Mll<106 GeV/c²
!Z : not Zee (Z-veto), dilepton invariant mass is Mll<76 OR Mll>106 GeV/c²
lo : low refers to MET<10 GeV
hi : high refers to MET>15 GeV
Combinations of these names give other control regions, for example !Zlo is !Z with low MET,
Zhi is Z with high MET.
Plot shows the agreement in dilepton control regions.
The uncertainties are statistical, along with systematic uncertainties due to lepton identification,
trigger efficiencies and NLO corrections to the cross section of background process.
Plot shows the invariant mass distribution of lepton
pairs for dilepton events with missing transverse energy < 10 GeV.
Same as above, linear scale.
Plot shows the missing transverse energy for dilepton events
with lepton pair invariant mass in the 'Z' window : 76<Mll<106 GeV/c²
Same as above, linear scale.
BACK
Control Regions (TRILEPTON)
The figure illustrates our control regions for trilepton selection.
The !Zhi region, with Z-veto and high MET is now our signal region. We test the regions Zlo,Zhi,
and !Zhi.
Plot shows the agreement in trilepton control regions.
The uncertainties are statistical, along with systematic uncertainties due to lepton identification,
trigger efficiencies and NLO corrections to the cross section of background process.
Plot shows the highest invariant mass distribution of
opposite-charge lepton pairs for dilepton+track(2tight,1Track) events with missing transverse
energy(MET) < 10 GeV.
Plot shows the missing transverse energy distribution for
dilepton+track(2tight,1Track) events with highest opposite-charge lepton pair mass in 'Z'
window : 76<Mll<106 GeV/c²
Plot shows the track PT distribution for
dilepton+track(2tight,1Track) events with highest opposite-charge lepton pair mass in 'Z'
window : 76<Mll<106 GeV/c²
Plot shows the highest invariant mass distribution of
opposite-charge lepton pairs for trilepton events(3tight) with missing transverse energy < 10 GeV.
Plot shows the softest lepton ET distribution for
opposite-charge lepton pairs for trilepton events(3tight) with highest opposite-charge
lepton pair mass in 'Z' window : 76<Mll<106 GeV/c²
BACK
Sourabh Dube
Last modified: Wed Jun 4 14:11:05 CDT 2008
