Background estimation for 4leptons
17
Background estimation for 4leptons 1 May 14, 2014 Jongseok Lee (Sungkyunkwan University)
description
Background estimation for 4leptons. May 14, 2014 Jongseok Lee (Sungkyunkwan University). M(l + l + ) and M(l - l - ). nlep+>=2, nlep->=2, µµµµ. M(l + l + ). M(l - l - ). M(l + l + ) VS M(l - l - ). nlep+>=2, nlep->=2, µµµµ. M(l - l - ). M(l - l - ). side band. side band. - PowerPoint PPT Presentation
Transcript of Background estimation for 4leptons
Background estimation for 4leptons
1
May 14, 2014 Jongseok Lee(Sungkyunkwan University)
M(l+l+) and M(l-l-)
2
nlep+>=2, nlep->=2, µµµµ
M(l+l+) M(l-l-)
M(l+l+) VS M(l-l-)
3
nlep+>=2, nlep->=2, µµµµ
M(l+l+)
M(l-l-)
M(l+l+)
M(l-l-)
MC Data
side band
signal region
side band
signal region
xmin/xmax
100 150 200 250 300
50 0.47±0.28 0.20±0.07 0.33±0.12 0.43±0.16 0.37±0.14
100 - 0.40±0.40 0.42±0.31 0.35±0.21 0.24±0.13
150 - - NSR,Data=0 NSR,Data=0 NSR,Data=0
200 - - - NSR,Data=0 NSR,Data=0
250 - - - - NSR,Data=0
(αMC-α Data)/αMC by mass window
4
µµµµ channel, Mll<350
M(l+l+) and M(l-l-)
5
nlep+>=2, nlep->=2, eeee
M(l+l+) M(l-l-)
M(l+l+) VS M(l-l-)
6
nlep+>=2, nlep->=2, eeee
M(l+l+)
M(l-l-)
M(l+l+)
M(l-l-)
MC Data
side band
signal region
side band
signal region
xmin/xmax
100 150 200 250 300
50 0.11±0.05 0.27±0.10 0.21±0.08 0.17±0.07 0.42±0.18
100 - NSR,Data=0 0.45±0.33 0.38±0.23 0.25±0.14
150 - - NSR,Data=0 NSR,Data=0 0.07±0.07
200 - - - NSR,Data=0 NSR,Data=0
250 - - - - NSR,Data=0
7
eeee channel, Mll<350
(αMC-α Data)/αMC by mass window
M(l+l+) and M(l-l-)
8
nlep+>=2, nlep->=2, µeµe
M(l+l+) M(l-l-)
M(l+l+) VS M(l-l-)
9
nlep+>=2, nlep->=2, µeµe
M(l+l+)
M(l-l-)
M(l+l+)
M(l-l-)
MC Data
side band
signal region
side band
signal region
xmin/xmax
100 150 200 250 300
50 0.04±0.01 0.07±0.02 0.28±0.07 0.21±0.05 0.08±0.02
100 - 0.51±0.37 0.28±0.12 0.06±0.02 0.003±0.001
150 - - 0.28±0.28 0.71±0.42 1.13±0.52
200 - - - 8.61±6.19 5.50±3.25
250 - - - - NSR,Data=0
10
µeµe channel, Mll<350
(αMC-α Data)/αMC by mass window
m150 m200 m300 m400 m500 m600
Signal
mmmm 4.3% 4.3% 4.3% 4.3% 4.3% 4.3%
eeee 2.4% 2.2% 2.1% 2.0% 1.9% 1.9%
emem 3.4% 3.3% 3.2% 3.2% 3.1% 3.1%
Background
mmmm 0.001% 0% 0% 0.007% 0% 0.002%
eeee 0.23% 0.21% 0.03% 0.08% 0.36% 0.35%
emem 0.16% 0.08% 0.09% 0.23% 0.21% 0.24%
Lepton eff. uncertainty (ΔN/N)
11
Weekly plan
• Background estimation
12
backup
13
xmin/xmax
100 150 200 250 300
50 0.47±0.28 0.20±0.07 0.33±0.12 0.43±0.16 0.37±0.14
100 - 0.40±0.40 0.42±0.31 0.35±0.21 0.24±0.13
150 - - NSR,Data=0 NSR,Data=0 NSR,Data=0
200 - - - NSR,Data=0 NSR,Data=0
250 - - - - NSR,Data=0
(αMC-α Data)/αMC by mass window
14
µµµµ channel, Mll<350
xmin/xmax
100 150 200 250 300
50 0.11±0.05 0.27±0.10 0.21±0.08 0.17±0.07 0.42±0.18
100 - NSR,Data=0 0.45±0.33 0.38±0.23 0.25±0.14
150 - - NSR,Data=0 NSR,Data=0 0.07±0.07
200 - - - NSR,Data=0 NSR,Data=0
250 - - - - NSR,Data=0
15
eeee channel, Mll<350
(αMC-α Data)/αMC by mass window
xmin/xmax
100 150 200 250 300
50 0.04±0.01 0.07±0.02 0.28±0.07 0.21±0.05 0.08±0.02
100 - 0.51±0.37 0.28±0.12 0.06±0.02 0.003±0.001
150 - - 0.28±0.28 0.71±0.42 1.13±0.52
200 - - - 8.61±6.19 5.50±3.25
250 - - - - NSR,Data=0
16
µeµe channel, Mll<350
(αMC-α Data)/αMC by mass window
Sideband method
17
events. of # reasonable afor selection event without events of# theis N and N
yuncertaint lstatistica N assumed isit then y,uncertaint lstatistica N If
sidebands. in the events data of # total theis N
data, from estimatedregion signal in the events background of # theis N where
,1 N
1 oferror relative a and
,1 N N
yuncertaint lstatistica N assumed isit then y,uncertaint lstatistica N if
, N assumed isit then 0, N if
MC. by the prediced as regions sideband and signal in the events theare N and N where
,N
N
region. signal in theon contributi background theestimate toused is method sidebandA
DataSBSB
BGSRBGSR
DataSB
BGSR
DataSB
DataSBBGSR
SRSR
SRSB
SBSR
SB
SR
