Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Serarch for Supersymmetry, A Status Report
Gunn Kristine Holst Larsen, UiO
August 22, 2008
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Why The SS Channel?
◮ glouno is majorana particle
◮ Standard Model background small
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Why Include The 1-lep Channel If Time?
◮ One leg giving lepton reduce QCD background
◮ Interesting to fight more background, already have the tools.
◮ This study missing in the group.
◮ Opportunity to study endpoint.
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Datasets Used
◮ QCD 8090-8094 pythia
◮ VV 5985, 5986, 5987 herwig
◮ Z 8190-8192 pythia
◮ W 8270-8273 pythia
◮ tt 5200, 5204 MC@NLO
◮ SU1, SU2, SU3, SU4, SU6, SU8, 5401-5406, 6400 jimmy
Do precut on all samples. E
/T >100 GeV, pT jet(1,2)> (100,50)GeV. Do this in order
to be able to compare different backgrounds, sincse the selection has been done on
some of the samples.
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
Definition of Primary and Secondary Leptons.
◮ Primary leptons are electrons and muons that decay from a gauge boson, a
primary tau lepton or a Supersymmetric particle.
◮ Secondary leptons decay from all other particles. Also include facke leptons here.
Σprimary with isolation cut
Σprimary without isolation cut
Σsecondary with isolation cut
rs = 1 −
Σsecondary without isolation cut
ǫp =
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
(1)
(2)
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
Distinguish primary/secondary leptons
◮ pT
◮ Calorimeter based /track based isolation
◮ ∆Rlepton−jet
The variable etcone20 is the sum of energy deposit inside a distance ∆R <0.2 from
the lepton. The mean energy loss due to ionization is subtracted from muons and cells
associated with the electromagnetic cluster is excluded for electrons.
∆R =
q
((φ1 − φ2 )2 + (η1 − η2 )2 ) ,
Gunn Kristine Holst Larsen, UiO
θ
η = − ln[tan( )]
2
Serarch for Supersymmetry, A Status Report
(3)
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
50
SU3 prime
40
SU3 sec
etcone20
etcone20
pT vs etcone20
50
SU3 sec
30
30
20
20
10
10
0
-10
0
SU3 prime
40
0
100
200
300
400
500
600
p electrons
T
-10
0
100
200
300
400
500
600
p muons
T
In this plot angular distance to jet has been checked. This is not the case for the one
dimmensional plots following.
Calorimeter isolation and removal because of distanse to jet is highly correlated.
Specially for muons.
See that using a combination etcone/pT can be a good idea.
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
SU3 prime
104
SU3 sec
T1 prime
103
T1 sec
2
10
10
1
-10
Events/1fb-1/1GeV
Events/1fb-1/1GeV
etcone20 of Leptons Before Selection
SU3 prime
104
SU3 sec
T1 prime
103
T1 sec
2
10
10
-5
0
5
10
15
20
25
30
35
40
etcone20 electron [GeV]
Gunn Kristine Holst Larsen, UiO
1
-10
-5
0
5
10
15
20
25
30
35
40
etcone20 muon [GeV]
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
SU3 prime
104
SU3 sec
T1 prime
103
T1 sec
Events/1fb-1/0.01
Events/1fb-1/0.01
NORMetcone20 of Leptons Before Selection
SU3 sec
T1 prime
103
102
102
10
10
1
-0.1 -0.05
0
0.05
NORMetcone20 =
0.1 0.15 0.2 0.25 0.3 0.35 0.4
NORMetcone20 electron [GeV]
SU3 prime
104
1
-0.1 -0.05
T1 sec
0
0.05
0.1 0.15 0.2 0.25 0.3 0.35 0.4
NORMetcone20 muon [GeV]
etcone20
pT (lepton)
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
SU3 prime
104
SU3 sec
T1 prime
103
T1 sec
102
Events/1fb-1/10GeV
Events/1fb-1/10GeV
∆ R and pT of Leptons Before Selection
10
100
150
200
250
T1 prime
T1 sec
102
SU3 sec
T1 prime
103
1
0
300
350
400
pt electron [GeV]
SU3 prime
104
T1 sec
102
10
1
0
SU3 sec
103
10
50
Events/1fb-1/10GeV
Events/1fb-1/10GeV
1
0
SU3 prime
104
50
100
150
200
250
300
350
400
pt muon [GeV]
SU3 prime
104
SU3 sec
T1 prime
103
T1 sec
102
10
50
100
150
200
250
300
350
400
pt electron [GeV]
Gunn Kristine Holst Larsen, UiO
1
0
50
100
150
200
250
300
350
400
pt muon [GeV]
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
The Standard Selection Criterias
1 Veto events with electrons with 1.37 < |η| < 1.52
2 Leptons: pT > 10GeV, |η| <2.5
Jets: pT > 20GeV, |η| <2.5
3 Isolation: etcone20 < 10 GeV for electrons and muons
4 Overlap removal (∆R(e−Jet) < 0.2 → remove jet)
5 Lepton angular distance to jet
(∆R(e,µ−Jet) < 0.4 → remove lepton)
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
SU1
SU2
SU3
T1
0.6
0.5
∈_p x r_s
∈_p x r_s
Difference etcone20 and NORMcone Performance
0.86
SU1
SU2
SU3
T1
0.84
0.82
0.8
0.78
0.76
0.4
0.74
0.72
0.3
EtCone20
τ primary mother
4
6
8
10
12
14
Electrons: etcone20 [GeV]
0.8
SU1
SU2
SU3
T1
0.7
0.6
0.5
2
∈_p x r_s
2
∈_p x r_s
EtCone20
τ primary mother
0.7
0.68
0.2
4
6
0.85
8
10
12
14
Muons: etcone20 [GeV]
SU1
SU2
SU3
T1
0.8
0.75
0.4
0.7
0.3
EtCone20/pt(lepton)
τ primary mother
0.2
0
0.1
0.2
EtCone20/pt(lepton)
τ primary mother
0.65
0.3
0.4
0.5
Electrons: normalized etcone20
Gunn Kristine Holst Larsen, UiO
0.6
0
0.1
0.2
0.3
0.4
0.5
Muons: normalized etcone20
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
0.9
SU1
SU2
SU3
T1
0.8
0.7
∈_p
∈_p
NORMetcone20 Efficiency and Rejection
0.9
SU1
SU2
SU3
T1
0.85
0.8
0.6
0.75
0.5
0.4
0.7
0.3
EtCone20/pt(lepton)
τ primary mother
0.2
0
0.1
0.2
0.6
0.3
0.4
0.5
Electrons: normalized etcone20
EtCone20/pt(lepton)
τ primary mother
0
0.1
0.2
0.3
0.4
0.5
Muons: normalized etcone20
r_s
r_s
0.1
0.65
1
SU1
SU2
SU3
T1
0.9
0.8
0.7
0.99
SU1
SU2
SU3
T1
0.98
0.97
0.6
0.96
0.5
0.95
0.4
EtCone20/pt(lepton)
τ primary mother
0.3
0
0.1
0.2
EtCone20/pt(lepton)
τ primary mother
0.94
0.3
0.4
0.5
Electrons: normalized etcone20
Gunn Kristine Holst Larsen, UiO
0
0.1
0.2
0.3
0.4
0.5
Muons: normalized etcone20
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
Performance etcone20
ELECTRONS
SU1
SU2
SU3
T1
ǫp
rs
ǫp
rs
ǫp
rs
ǫp
rs
:
:
:
:
:
:
:
:
etcone20 < 10
0.921
0.456
0.841
0.405
0.910
0.403
0.922
0.336
Gunn Kristine Holst Larsen, UiO
etcone20 < 5
0.891
0.675
0.812
0.663
0.885
0.607
0.901
0.563
NORMetcone20 < 0.14
0.907
0.736
0.833
0.810
0.894
0.671
0.905
0.740
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
Performance etcone20
MUONS
SU1
SU2
SU3
T1
ǫp
rs
ǫp
rs
ǫp
rs
ǫp
rs
:
:
:
:
:
:
:
:
etcone20 < 10
0.888
0.968
0.797
0.950
0.878
0.972
0.896
0.933
Gunn Kristine Holst Larsen, UiO
etcone20 < 5
0.877
0.974
0.783
0.964
0.868
0.977
0.882
0.947
NORMetcone20 < 0.26
0.885
0.975
0.796
0.964
0.875
0.979
0.894
0.952
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
pT criteria
It is normal to require pT of the two leptons to be bigger than 20 in Same Sign
search. When NORMetcone20 is used, pT of the leptons already taken into account.
Check if additional cut here give better lepton selection.
Note difference from NORMetcone20 scan. Here measure relative efficiency.
(Compare to pT > 10 GeV)
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
1
0.95
SU1
SU2
SU3
T1
0.9
0.85
∈_p
∈_p
Additional pT Cut On Leptons Efficiency and Rejection
1
SU1
SU2
SU3
T1
0.9
0.8
0.8
0.75
0.7
0.7
0.65
0.6
0.55
0.6
p scan
p scan
T
10
0.5
15
20
25
30
35
Electrons: p [GeV]
T
10
15
20
25
30
0.7
SU1
SU2
SU3
T1
0.6
0.5
SU1
SU2
SU3
T1
0.8
0.7
0.5
0.3
0.4
0.2
10
1
0.9
0.6
0.4
0.1
35
Muons: p [GeV]
T
r_s
r_s
T
0.3
p scan
0.2
T
15
20
25
30
35
Electrons: p [GeV]
T
Gunn Kristine Holst Larsen, UiO
0.1
10
p scan
T
15
20
25
30
35
Muons: p [GeV]
T
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
Choice
◮ electron: NORMetcone20<0.14GeV
◮ muon: NORMetcone20<0.26GeV
◮ pT > 15 GeV
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Lepton Variables
The Standard Object Selection
Scan etcone20
Scan pT
Events/1fb-1/100GeV
Effective Mass Plot di-Leptons
5
10
SU3
tt
W
Z
QCD
VV
104
3
10
sum bg
102
ATLAS Preliminary
10
500
1000 1500
2000
2500
3000 3500 4000
Meff [GeV]
Events/1fb-1/100GeV
Events/1fb-1/100GeV
1
0
SU3
tt
W
Z
QCD
VV
3
10
102
sum bg
ATLAS Preliminary
10
1
0
500
1000 1500
2000
2500
3000 3500 4000
>2lep: M [GeV]
eff
Figure:Gunn
Without
isolation.
Kristine Holst
Larsen, UiO
SU3
tt
W
Z
QCD
VV
102
sum bg
10
1
0
ATLAS Preliminary
500
1000 1500
2000
2500
3000 3500 4000
>2lep: M [GeV]
eff
Figure: With isolation.
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Variables Same Sign Selection(Lepton==2)
Significance Matrix Scan
How to choose SS
◮ Exact two Same Sign Leptons
◮ 3 leptons always have a same sign combination
◮
◮
3 primarys
2 primarys 1 secondary
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
2lep
> 2lep
SU2
134
80
SU3
2061
1703
SU4
465
156
T1
108
24
These numbers not scaled.
luminosity 1fb−1
1p+1s
2p
Variables Same Sign Selection(Lepton==2)
Significance Matrix Scan
2p+1s
3p
0.07
0.06
0.09
0.06
0.15
0.08
11.0
0.23
Numbers in all other tables and plot scaled to integrated
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Variables Same Sign Selection(Lepton==2)
Significance Matrix Scan
102
sum bg
ATLAS Preliminary
SU3
tt
W
Z
QCD
VV
102
sum bg
10
Events/1fb-1/100GeV
SU3
tt
W
Z
QCD
VV
103
Events/1fb-1/100GeV
Events/1fb-1/100GeV
Jet pT
ATLAS Preliminary
1
SU3
tt
W
Z
QCD
VV
-1
10
sum bg
ATLAS Preliminary
10-2
10
50
100
150
1
0
200
250
300
350
400
p 1st Lepton Primary [GeV]
50
100
150
SU3
tt
W
Z
QCD
VV
102
sum bg
10
102
SU3
tt
W
Z
QCD
VV
10
sum bg
ATLAS Preliminary
1
0
50
100
150
200
250
300
350
400
p 1st Lepton Secondary [GeV]
10-3
200
250
300
350
400
p 2nd Lepton Primary [GeV]
0
50
100
150
T
Events/1fb-1/100GeV
Events/1fb-1/100GeV
T
200
250
300
350
400
p 3rd Lepton Primary [GeV]
T
Events/1fb-1/100GeV
1
0
102
SU3
tt
W
Z
QCD
VV
10
sum bg
ATLAS Preliminary
1
0
50
100
T
Gunn Kristine Holst Larsen, UiO
150
200
250
300
350
400
p 2nd Lepton Secondary [GeV]
T
ATLAS Preliminary
1
0
50
100
150
200
250
300
350
400
p 3rd Lepton Secondary [GeV]
T
Serarch for Supersymmetry, A Status Report
102
SU3
tt
W
Z
QCD
VV
10
Variables Same Sign Selection(Lepton==2)
Significance Matrix Scan
Events/1fb-1/20GeV
Events/1fb-1/100GeV
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
SM bg
102
SU3
tt
W
Z
QCD
VV
10
SM bg
ATLAS Preliminary
500
1000
1500
2000
2500
102
3000
SU3
tt
W
Z
QCD
VV
10
1
0
3500 4000
Meff [GeV]
100 200 300 400 500
102
SU3
tt
W
Z
QCD
VV
10
SM bg
SM bg
ATLAS Preliminary
1
0
0.2
0.4
0.6
0.8
1
1.2
600 700 800 900 1000
Missing E [GeV]
T
Events/1fb-1/0.12
Events/1fb-1/0.06
1
0
ATLAS Preliminary
ATLAS Preliminary
1.4 1.6 1.8
(Missing E )/(M )
T
eff
Gunn Kristine Holst Larsen, UiO
1
-0.4 -0.2
-0
0.2
0.4
0.6
0.8
1
1.2
1.4
ST
Serarch for Supersymmetry, A Status Report
102
SU3
tt
W
Z
QCD
VV
10
SM bg
Variables Same Sign Selection(Lepton==2)
Significance Matrix Scan
Events/1fb-1/20GeV
Events/1fb-1/20GeV
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
102
SU3
tt
W
Z
QCD
VV
10
SM bg
ATLAS Preliminary
1
0
200
400
600
ATLAS Preliminary
1
0
800
1000
p Jet1 [GeV]
200
400
102
SU3
tt
W
Z
QCD
VV
10
SM bg
102
100 200 300 400 500
600 700 800 900 1000
p Jet3 [GeV]
T
Gunn Kristine Holst Larsen, UiO
800
1000
p Jet2 [GeV]
SU3
tt
W
Z
QCD
VV
10
SM bg
ATLAS Preliminary
1
0
600
T
Events/1fb-1/20GeV
Events/1fb-1/20GeV
T
ATLAS Preliminary
1
0
100 200 300 400 500
600 700 800 900 1000
p Jet4 [GeV]
T
Serarch for Supersymmetry, A Status Report
40
SU3
tt
W
Z
QCD
VV
35
30
25
20
SM bg
15
Variables Same Sign Selection(Lepton==2)
Significance Matrix Scan
Events/1fb-1/1GeV
Events/1fb-1/1GeV
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
100
80
SM bg
60
ATLAS Preliminary
40
20
5
2
4
6
8
10
12
14
102
16
18
20
Number of jets
SU3
tt
W
Z
QCD
VV
10
0
Events/1fb-1/0.24
Events/1fb-1/0.24
SU3
tt
W
Z
QCD
VV
120
ATLAS Preliminary
10
0
140
2
4
6
8
10
SU3
tt
W
Z
QCD
VV
10
SM bg
1
2
3
4
14
16
18
20
Number of leptons
102
SM bg
ATLAS Preliminary
1
0
12
5
6
delφ [rad]
1
Gunn Kristine Holst Larsen, UiO
ATLAS Preliminary
1
0
1
2
3
4
5
6
delφ [rad]
2
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Variables Same Sign Selection(Lepton==2)
Significance Matrix Scan
Small Test of My Tool
Do all combinations of
◮ E
/T (100000,150000,200000);
◮ number of jet (2,3,4);
◮ jet1pt (100000,150000,200000);
◮ jet2pt (50000,100000,150000);
From these 18 combinations get best result for
1: E
/T > 100000, Jets>= 4, pT jet1 > 100000, pT jet2 > 150000 (SU2)
2: E
/T > 200000, Jets>= 2, pT jet1 > 200000, pT jet2 > 50000 (SU1,SU3,SU6)
Compare significance for these two points to no cut (3:). All significance calculated for
Meff > 500 GeV.
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Variables Same Sign Selection(Lepton==2)
Significance Matrix Scan
Significance table
Signal
CUT
B
S
√S
B
SU1
Cut01
Cut02
Cut03
Cut01
Cut02
Cut03
Cut01
Cut02
Cut03
Cut01
Cut02
Cut03
Cut01
Cut02
Cut03
Cut01
Cut02
Cut03
2.31
1.54
23.52
2.31
1.54
23.52
2.31
1.54
23.52
2.31
1.54
23.52
2.31
1.54
23.52
2.31
1.54
23.52
26.59
45.01
63.61
8.60
6.16
13.00
30.91
45.31
76.90
88.13
110.17
627.97
16.75
25.27
34.70
9.53
14.57
23.82
17.47
36.22
13.11
5.65
4.95
2.68
20.31
36.47
15.85
57.91
88.65
129.46
11.00
20.34
7.15
6.26
11.72
4.91
SU2
SU3
SU4
SU6
SU8
Gunn Kristine Holst Larsen, UiO
S
q
2
B+σsyst
16.71
35.15
9.41
5.40
4.81
1.92
19.43
35.39
11.38
55.40
86.04
92.92
10.53
19.74
5.13
5.99
11.37
3.52
√S
S+B
4.94
6.59
6.81
2.60
2.21
2.15
5.36
6.62
7.67
9.26
10.42
24.60
3.83
4.88
4.54
2.76
3.62
3.46
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Variables Same Sign Selection(Lepton==2)
Significance Matrix Scan
102
SU2
SU3
SU4
10
SM bg
Events/1fb-1/100GeV
Events/1fb-1/100GeV
Meff plot for cut 1, 2 and 3
102
SU2
SU3
SU4
10
SM bg
ATLAS Preliminary
Events/1fb-1/100GeV
1
0
500
1000
1500
2000
2500
3000 3500 4000
Cut1 Meff [GeV]
ATLAS Preliminary
1
0
500
1000
1500
2000
2500
3000 3500 4000
Cut1 Meff [GeV]
102
SU2
SU3
SU4
10
SM bg
ATLAS Preliminary
1
0
500
1000
1500
2000
2500
3000 3500 4000
Cut3 Meff [GeV]
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Variables Same Sign Selection(Lepton==2)
Significance Matrix Scan
To be compared to CSC note 5 selection.
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
The Z-boson, W-boson and top-quark
Events/1fb-1/4GeV
Events/1fb-1/4GeV
Z boson
10000
tt
W
Z
QCD
VV
8000
6000
Z->ee
Z->µν
4000
ATLAS Preliminary
2000
0
50
100
150
200
250
300
Mll[GeV]
Gunn Kristine Holst Larsen, UiO
240
220
200
180
160
140
120
100
80
60
40
20
0
tt
W
Z
QCD
VV
ATLAS Preliminary
50
100
150
200
250
300
SS lep: M [GeV]
ll
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
The Z-boson, W-boson and top-quark
W boson
Events/1fb-1/4GeV
NR 16 missing
14000
12000
tt
W
Z
QCD
VV
10000
8000
W->eν
W->µ ν
6000
ATLAS Preliminary
4000
2000
0
50
100
150
200
250
300
MT[GeV]
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
The Z-boson, W-boson and top-quark
Events/1fb-1/4GeV
Events/1fb-1/4GeV
top quark
50000
tt
W
Z
QCD
VV
40000
30000
mjjj
mjj
20000
ATLAS Preliminary
10000
Events/1fb-1/4GeV
0
2500
tt
W
Z
QCD
VV
2000
1500
mjjj
mjj
1000
ATLAS Preliminary
500
50
100
150
200
250
300
Mll[GeV]
0
50
100
150
200
250
300
> 1 lep: M [GeV]
ll
4.5
tt
W
Z
QCD
VV
4
3.5
3
mjjj
mjj
2.5
ATLAS Preliminary
2
1.5
10
50
100
150
200
250
300
SS lep: M [GeV]
ll
Gunn Kristine Holst Larsen, UiO
Serarch for Supersymmetry, A Status Report
104
SU3
tt
W
Z
QCD
VV
3
10
102
Variables One-Lepton Selection
Events/1fb-1/20GeV
Events/1fb-1/100GeV
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
SM bg
104
SU3
tt
W
Z
QCD
VV
3
10
102
SM bg
ATLAS Preliminary
ATLAS Preliminary
10
10
500
1000 1500
2000
2500
104
SU3
tt
W
Z
QCD
VV
3
10
102
1
0
3000 3500 4000
Meff [GeV]
SM bg
100 200 300 400 500 600 700 800 900 1000
Missing E [GeV]
T
Events/1fb-1/0.12
Events/1fb-1/0.06
1
0
SU3
tt
W
Z
QCD
VV
103
102
SM bg
ATLAS Preliminary
ATLAS Preliminary
10
10
1
0
0.2
0.4
0.6
0.8
1
1.2
1.4 1.6 1.8
(Missing E )/(M )
T
eff
Gunn Kristine Holst Larsen, UiO
1
-0.4 -0.2
-0
0.2
0.4
0.6
0.8
1
1.2
1.4
ST
Serarch for Supersymmetry, A Status Report
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
Variables One-Lepton Selection
SU3
tt
W
Z
QCD
VV
3
10
102
SM bg
Events/1fb-1/20GeV
Events/1fb-1/20GeV
Jet pT
104
SU3
tt
W
Z
QCD
VV
3
10
102
SM bg
ATLAS Preliminary
ATLAS Preliminary
10
1
0
10
200
400
600
1
0
800
1000
p Jet1 [GeV]
104
3
10
102
SU3
tt
W
Z
QCD
VV
SM bg
1
0
400
600
800
1000
p Jet2 [GeV]
104
3
10
102
ATLAS Preliminary
10
200
T
Events/1fb-1/20GeV
Events/1fb-1/20GeV
T
SU3
tt
W
Z
QCD
VV
SM bg
ATLAS Preliminary
10
100 200 300 400 500 600 700 800 900 1000
p Jet3 [GeV]
T
Gunn Kristine Holst Larsen, UiO
1
0
100 200 300 400 500 600 700 800 900 1000
p Jet4 [GeV]
T
Serarch for Supersymmetry, A Status Report
8000
25000
SU3
tt
W
Z
QCD
VV
7000
6000
5000
4000
SU3
tt
W
Z
QCD
VV
20000
15000
SM bg
3000
Variables One-Lepton Selection
Events/1fb-1/1GeV
Events/1fb-1/1GeV
Introduction
Optimize Lepton Object Selection
The Same Sign Channel
Background Study
The One-Lepton Channel
ATLAS Preliminary
SM bg
10000
2000
ATLAS Preliminary
5000
1000
2
4
6
8
10
12
14
104
16 18 20
Number of jets
10
SU3
tt
W
Z
QCD
VV
102
SM bg
3
0
Events/1fb-1/0.24
Events/1fb-1/0.24
0
2
4
6
8
10
14
16 18 20
Number of leptons
SU3
tt
W
Z
QCD
VV
3
10
102
SM bg
ATLAS Preliminary
ATLAS Preliminary
10
10
1
0
12
1
2
3
4
5
6
delφ [rad]
1
Gunn Kristine Holst Larsen, UiO
1
0
1
2
3
4
5
6
delφ [rad]
2
Serarch for Supersymmetry, A Status Report