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Improving Jet Substructure Performance in ATLAS with Unified Tracking and Calorimeter Inputs Connecting The Dots 2018 Roland Jansky, University of Geneva 21 st March 2018
Improving Jet Substructure Performance in ATLAS with Unified Tracking and Calorimeter InputsConnecting The Dots 2018
Roland Jansky, University of Geneva
21st March 2018
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proton proton
something new?X
Jets at the Energy Frontier
• 𝑠 = 13
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H
W
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Jet Substructure (1/2)
two-prong structure (D2)
jet mass:
~ 1/pT ~ 1/mX
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Jet Substructure (2/2)
Motivation for TrackCaloClusters (1/3)
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ATL-PHYS-PUB-2017-015
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Motivation for TrackCaloClusters (3/3)
W’(1 TeV) WZqqqq
ATL-PHYS-PUB-2017-015
Idea of TrackCaloClusters
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σ𝑡𝑟𝑎𝑐𝑘• σ𝑐𝑙𝑢𝑠𝑡𝑒𝑟• σ𝑡𝑟𝑎𝑐𝑘 σ𝑐𝑙𝑢𝑠𝑡𝑒𝑟
• Δ𝑅 < σ𝑡𝑟𝑎𝑐𝑘2 + σ𝑐𝑙𝑢𝑠𝑡𝑒𝑟
2
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• 𝜂 𝜙•
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Tastes of TrackCaloClusters
• 𝑐
𝑘• 𝑐
𝑡•
𝑐𝑘
𝑡
Energy Reshuffling (1/2)
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Energy Reshuffling (2/2)
W’(1 TeV) qqqq W’(5 TeV) qqqq
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Matching Efficiencies
pTTCC > 10 GeV ηTCC < 2.5
“And Then There Were Jets”
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𝑅 𝑓𝑐𝑢𝑡𝑅𝑠𝑢𝑏
Topo-clusterAnti-kt 𝑹=1.0 Jet (untrimmed)
kt 𝑹=0.2, 𝒇𝒄𝒖𝒕>5% sub-jets
“And Then There Were Jets”
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𝑅 𝑓𝑐𝑢𝑡𝑅𝑠𝑢𝑏
Topo-clusterAnti-kt 𝑹=1.0 Jet (untrimmed)
kt 𝑹=0.2, 𝒇𝒄𝒖𝒕>5% sub-jets
“And Then There Were Jets”
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𝑅 𝑓𝑐𝑢𝑡𝑅𝑠𝑢𝑏
Combined TCCCharged TCCNeutral TCCAnti-kt 𝑹=1.0 Jet (untrimmed)
kt 𝑹=0.2, 𝒇𝒄𝒖𝒕>5% sub-jets
“And Then There Were Jets”
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𝑅 𝑓𝑐𝑢𝑡𝑅𝑠𝑢𝑏
Combined TCCCharged TCCNeutral TCCAnti-kt 𝑹=1.0 Jet (untrimmed)
kt 𝑹=0.2, 𝒇𝒄𝒖𝒕>5% sub-jets
Mass Performance (1/2)
• ℛ𝑟 = 𝑚reco/𝑚true
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0.7 TeV < pT,jet < 0.8 TeV 2.1 TeV < pT,jet < 2.5 TeV
TCCLCTopo
Mass Performance (2/2)
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IQR𝑟 =1
2
𝑄75 ℛ𝑟 −𝑄25 ℛ𝑟
𝑄50 ℛ𝑟 𝑄𝑥 𝑥
0.7 TeV < pT,jet < 0.8 TeV
LCTopoTCC
LCTopo
TCC
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D2 Performance (1/2)
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• ℛ𝑑 = 𝐷2reco − 𝐷2
true
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0.7 TeV < pT,jet < 0.8 TeV 2.1 TeV < pT,jet < 2.5 TeV
TCC
LCTopoTCC LCTopo
D2 Performance (2/2)
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IQR𝑑 =1
2𝑄75 ℛ𝑑 − 𝑄25 ℛ𝑑 𝑄𝑥 𝑥
0.7 TeV < pT,jet < 0.8 TeV
LCTopoTCC
1
2LCTopo
TCC
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Summary
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BACKUP
