alpgen mc samples jet flavour identifier lepton id plots
DESCRIPTION
Alpgen MC Samples Jet Flavour Identifier Lepton ID Plots. Alpgen Settings for CMS. Alpgen v2.05 CMS Default kinematic cuts in Alpgen Pt(l,c,b) > 20 GeV |eta (j,c,b)| < 5.0 |eta(e,mu,tau)| < 3.0 dR(jj)>=0.7 dR(lj)>=0.0 M_top = 175 GeV. Alpgen Data Samples. W+NJets Wbb+NJets Z+NJets - PowerPoint PPT PresentationTRANSCRIPT
Alpgen MC Samples
Jet Flavour Identifier
Lepton ID Plots
Alpgen Settings for CMS
Alpgen v2.05 CMS Default kinematic cuts in Alpgen
Pt(l,c,b) > 20 GeV |eta (j,c,b)| < 5.0 |eta(e,mu,tau)| < 3.0 dR(jj)>=0.7 dR(lj)>=0.0 M_top = 175 GeV
Alpgen Data Samples
W+NJets Wbb+NJets Z+NJets Zbb+NJets (running & failing on grid) WW/WZ/ZZ
Jet Multiplicity
Hard process has to be showered. Afterwards two possible modes:
Inclusive: Events with extra Jets due to the parton shower are kept.
Exclusive: Events with extra jets are rejected. For a exclusive sample set the one with the
highest jet mulitplicity must be a inclusive sample
Cuts in Event Selection
Electron |eta| < 2.4 Pt > 26 GeV
Muon |eta| < 2.1 Pt > 19 GeV
TQAF ID LeptonID >= 1 Track Isolation < 0.1 Likelihood Ratio > 0.5
Jets |eta| < 5 Pt > 30 GeV btag > 0.54 MET > 30
Selection Efficiency W+Jets
W+0 Jets W+1Jet W+2 Jets W+3 Jets W+4 Jets W+5 Jets W+6 Jets
Cross section [pb] 30 000 8 000 2 500 722 174 45 31
Total Events 195 933 191 966 180 937 50 199 72 585 55 209 19 619
2 Jet Bin 3 814 36 005 82 848 22 885 11 520 3 146 155
After Cuts:
All 6 36 808 252 150 53 3
Barrel Electrons 1 3 208 59 38 15 0
Endcap Electrons 1 2 64 28 16 11 1
Muons 4 31 536 165 96 27 2
Efficiency [%] 0.0031 0.019 0.45 0.50 0.21 0.096 0.015
JetslJetsWqq '
Jet Flavour Identifier
Algorithmic Definition Physics Definition
JFI – Algorithmic Definition
Find Parton that most likely determines the properties of the jet and assign its flavour as the “true” jet flavour
If b or c quark matches to jet cone (ΔR < 0.3) label jet as b or c jet
Else assign flavour of hardest parton to the jet
JFI – Physics Definition
Match reco jet to initial partons from primary process with ΔR < 0.3
No matching if hard final state radiation changes the parton direction significantly
No flavour assignement if matching is ambigous: >1 initial partons match the jet
Gluon jets splitting to c or b quarks are labeled as gluon
Jet Flavour in W+Jets
0 1 2 3 4 5 6
uds 56.1 57.4 49.4 44.0 40.3 37.6 33.5
c 0.8 12.9 10.9 9.8 8.5 7.7 6.8
b 0 0.2 0.6 0.9 1.1 1.5 2.1
g 43.1 29.4 39.1 45.2 50.1 53.3 57.6
W+Jets Pretag Sample TQAF uses Algorithmic Definition all jets in the events after preselection
Selection Efficiency Wbb+Jets
Wbb+2 Jets Wbb+3 Jets
Cross section [pb] 100
Total Events 147 894 22 982
2 Jet Bin 14 322 788
After Cuts:
All 768 40
Barrel Electrons 199 14
Endcap Electrons 90 3
Muons 479 23
Efficiency [%] 0.52 0.17
JetsbblJetsbbWqq '
Wbb+0/1 Jets not available yet
Selection Efficiency Z+Jets
Z+0 Jets Z+1Jet Z+2 Jets Z+3 Jets Z+4 Jets Z+5 Jets Z+6 Jets
Cross section [pb] 2 436 670 230 66 17 4 3
Total Events 43 814 47 869 46 560 47 913 21 402 4 779 4 185
2 Jet Bin 5 267 12 390 19 310 13 018 2 657 209 26
After Cuts:
All 1 31 86 81 25 5 1
Barrel Electrons 1 12 20 19 4 1 0
Endcap Electrons 0 5 6 10 2 0 0
Muons 0 14 60 52 19 4 1
Efficiency [%] 0.0023 0.065 0.18 0.17 0.12 0.10 0.024
JetsllJetsZqq 0
Selection Efficiency Di-Boson
WW (?) WZ ZZ
Cross section [pb] 10.5 4.3 2.6
Total Events 230 959 200 000 69 478
2 Jet Bin 72 601 59 631 20 239
After Cuts:
All 461 530 65
Barrel Electrons 126 148 14
Endcap Electrons 42 51 5
Muons 293 331 46
Efficiency [%] 0.20 0.27 0.094
llxZW llxZZ llWW
Selection Efficiency
tt Single top
Cross section [pb] 833 250
Total Events 2 732 326 192 400
2 Jet Bin 189 519 85 845
After Cuts:
All 42 463 12 845
Barrel Electrons 13 277 4 074
Endcap Electrons 2 707 795
Muons 26 479 7 976
Efficiency [%] 1.55 6.68
Track Probability Jet Tags Distribution
Peaks stem from bug in CMSW 1.3.6 algorithm. Fixed in CMSSW >= 1.5X
Lepton ID - ElectronsTQAF 136 070822 TQAF 136 071018
55 30245 978
55 209
45 978
Likelihood Ratio - ElectronsTQAF 136 070822 TQAF 136 071018
55 30245 978
55 209
45 978
Likelihood Ratio - Muon
11 50252 321
11 502
52 321
Track Isolation - ElectronsTQAF 136 070822 TQAF 136 071018
55 30245 978
55 209
45 978
Track Isolation - MuonTQAF 136 070822 TQAF 136 071018
52 32111 502
52 32111 502