Alpgen MC Samples Jet Flavour Identifier Lepton ID Plots.

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Presentation transcript:

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 JetsW+1JetW+2 JetsW+3 JetsW+4 JetsW+5 JetsW+6 Jets Cross section [pb] Total Events Jet Bin After Cuts: All Barrel Electrons Endcap Electrons Muons Efficiency [%]

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

JFI – Energetic Definition Only for GenJets Calculate energy fraction of b and c hadrons in the jet Use b/c energy ratio to determine jet flavour

TQAF JFI Settings RejectBC Splitting = false PhysicsDef = false fillPartons = true fillHeavyHadrons=false

Jet Flavour in W+Jets uds c b g  W+Jets Pretag Sample  TQAF uses Algorithmic Definition  all jets in the events after preselection

Selection Efficiency Wbb+Jets Wbb+2 JetsWbb+3 Jets Cross section [pb]100 Total Events Jet Bin After Cuts: All76840 Barrel Electrons19914 Endcap Electrons903 Muons47923 Efficiency [%] Wbb+0/1 Jets not available yet

Selection Efficiency Z+Jets Z+0 JetsZ+1JetZ+2 JetsZ+3 JetsZ+4 JetsZ+5 JetsZ+6 Jets Cross section [pb] Total Events Jet Bin After Cuts: All Barrel Electrons Endcap Electrons Muons Efficiency [%]

Selection Efficiency Di-Boson WW (?)WZZZ Cross section [pb] Total Events Jet Bin After Cuts: All Barrel Electrons Endcap Electrons42515 Muons Efficiency [%]

Selection Efficiency ttSingle top Cross section [pb] Total Events Jet Bin After Cuts: All Barrel Electrons Endcap Electrons Muons Efficiency [%]

Track Probability Jet Tags Distribution Peaks stem from bug in CMSW algorithm. Fixed in CMSSW >= 1.5X

Lepton ID - Electrons TQAF TQAF

Likelihood Ratio - Electrons TQAF TQAF

Likelihood Ratio - Muon

Track Isolation - Electrons TQAF TQAF

Track Isolation - Muon TQAF TQAF