Common Samples plots for LHCtopWG:

Nominal ATLAS and CMS settings

Comparison of nominal ATLAS and CMS settings for NLO Monte Carlo simulation of tt¯ events using Powheg-Box matched with Pythia 8. Plots show the distributions of the (a) leading jet transverse momentum, (b) second-leading jet transverse momentum, (c) scalar sum of jet momenta, and (d) jet multiplicity. Only events which pass the loose event selection criteria, requiring a charged lepton with pT > 30 GeV, and > 30 GeV of missing transverse energy are included in the distributions. The jet multiplicity and HT distributions only include jets with pT > 30 GeV. The ATLAS event simulation includes the use of EvtGen for heavy flavour hadron decays. EvtGen is not used in the CMS sample. Only statistical uncertainties are shown, they are indicated by the yellow band for the reference distribution, and by uncertainty bars for all other distributions.

Comparison of nominal ATLAS and CMS settings for NLO Monte Carlo simulation of tt¯ events using Powheg-Box matched with Pythia 8. Plots show the distributions of (a) the pseudorapidity difference between the leading b-jet and hadronic W-boson candidate, (b) ∆R between the leading b-jet and lepton, (c) ∆R between the leading b-jet and light-jet, (d) ∆R between the two leading light-jets. Only events which pass an event selection criteria consistent with tt¯ events in the lepton+jets final state, including the full jet selection criteria described in the text are included. The ATLAS event simulation includes the use of EvtGen for heavy flavour hadron decays. EvtGen is not used in the CMS sample. Only statistical uncertainties are shown, they are indicated by the yellow band for the reference distribution, and by uncertainty bars for all other distributions.

Comparison of nominal ATLAS and CMS settings for NLO Monte Carlo simulation of tt¯ events using Powheg-Box matched with Pythia 8. Plots show the distributions of the reconstructed masses of (a) the hadronically-decaying W-boson candidate, and (b) the hadronically decaying top quark candidates. Events are required to pass event selection criteria designed to select lepton + jets tt¯ events, including the full jet selection criteria as described in the text. The W boson mass is reconstructed from the two light-flavour jets with invariant mass closest to 80.4 GeV. The top quark mass is only reconstructed for events where the W mass is between 75 and 85 GeV; it is reconstructed for both combinations of the hadronic W with the two highest pT b-jets in the event. The ATLAS simulation includes the use of EvtGen for the decay of heavy flavour hadrons. EvtGen is not used in the CMS sample. Only statistical uncertainties are shown, they are indicated by the yellow band for the reference distribution, and by uncertainty bars for all other distributions.

Mixing ATLAS and CMS settings

Comparison of ATLAS and CMS settings for NLO Monte Carlo simulation of tt¯ events using PowhegBox matched with Pythia 8. ATLAS and CMS settings for Powheg-Box and Pythia 8 are mixed and matched, showing each of four possible combinations. Plots show the distributions of the reconstructed masses of (a) the hadronically-decaying W-boson candidate, and (b) the hadronically decaying top quark candidates. Events are required to pass event selection criteria designed to select lepton + jets tt¯ events, including the full jet selection criteria as described in the text. The W boson mass is reconstructed from the two light-flavour jets with invariant mass closest to 80.4 GeV. The top quark mass is only reconstructed for events where the W mass is between 75 and 85 GeV; it is reconstructed for both combinations of the hadronic W with the two highest pT b-jets in the event. The ATLAS Pythia settings include the use of EvtGen for heavy flavour hadron decays. EvtGen is not used in the CMS Pythia settings. Only statistical uncertainties are shown, they are indicated by the yellow band for the reference distribution, and by uncertainty bars for all other distributions.

Comparison showing the impact of EvtGen usage in NLO Monte Carlo simulation of tt¯ events in ATLAS simulation samples and compared to a nominal CMS sample (which does not include EvtGen) for reference. Both ATLAS and CMS use Powheg-Box interfaced with Pythia 8 for their nominal tt¯simulation setups. Plots show the distributions of the (a) leading jet transverse momentum, (b) second-leading jet transverse momentum, (c) scalar sum of jet momenta, and (d) jet multiplicity. Only events which pass the loose event selection criteria, requiring a charged lepton with pT > 30 GeV, and > 30 GeV of missing transverse energy are included in the distributions. The jet multiplicity and HT distributions only include jets with pT > 30 GeV. Only statistical uncertainties are shown, they are indicated by the yellow band for the reference distribution, and by uncertainty bars for all other distributions.

-- ReinhardSchwienhorst - 2019-11-13

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Topic revision: r1 - 2019-11-13 - ReinhardSchwienhorst
 
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