Generator

Details for Pythia 8.303 default vs. default-CD

pp/ppbar → Top (tt)


Observable Reference Energy χ2+5% (default) Δ χ2+5% (default-CD)
Asymmetry
 AC vs Mttbar
 CMS_2016_I1430892 8000 2.7 -2.1 0.60
Asymmetry
 AC vs pTttbar
 CMS_2016_I1430892 8000 12 -6.5 5.5
Asymmetry
 AC vs yttbar
 CMS_2016_I1430892 8000 4.6 -2.0 2.6
Asymmetry
 ACl vs Mttbar
 CMS_2016_I1430892 8000 1.1 -0.62 0.48
Asymmetry
 ACl vs pTttbar
 CMS_2016_I1430892 8000 0.43 +0.35 0.78
Asymmetry
 ACl vs yttbar
 CMS_2016_I1430892 8000 6.0 -3.7 2.3
Asymmetry
 Energy asymmetry
 ATLAS_2021_I1941095 13000 0.55 +0.44 0.99
B jet
 η
 CMS_2018_I1703993 13000 21 +1.0 22
B jet
 pT
 CMS_2018_I1703993 13000 25 +1.0 26
bjbj.m
 CMS_2018_I1703993 13000 30 +2.0 32
bjbj.pt
 CMS_2018_I1703993 13000 27 +3.0 30
bjt.dphi
 ATLAS_2022_I2037744 13000 0.74 +0.13 0.87
ej.pt
 ATLAS_2022_I2037744 13000 2.3 -0.20 2.1*
pT ratio
 Extra jets
 ATLAS_2020_I1801434 13000 2.5 +2.5 5.0
pT ratio
 Extra to leading jet
 ATLAS_2020_I1801434 13000 3.1 +0.10 3.2
pT ratio
 Extra jet to Top
 ATLAS_2020_I1801434 13000 2.5 +0.60 3.1
ΔR(extra jets)
 ATLAS_2020_I1801434 13000 2.6 -0.10 2.5
ejej.dphi
 ATLAS_2022_I2037744 13000 0.67 +1.3 2.0
ejets.ht
 CMS_2021_I1901295 13000 8.6 +2.4 11
ΔR(extra, leading jet)
 ATLAS_2020_I1801434 13000 3.2 +0.100 3.3
ΔR(top, extra jet)
 ATLAS_2020_I1801434 13000 1.9 +0.90 2.8
Jets + Veto
 Gap frac. vs Veto scale
 ATLAS_2012_I1094568 7000 0.13 +0.060 0.19
Jets + Veto
 Gap frac. vs scalar veto scale
 ATLAS_2012_I1094568 7000 0.051 +0.011 0.062
Jet mass
 Jet mass
 CMS_2017_I1518399 8000 4.8 -0.40 4.4
CMS_2019_I1764472 13000 0.28 +0.56 0.84
Jet pT
 ATLAS_2014_I1304688 7000 6.8 +0.60 7.4
ATLAS_2019_I1718132 13000 3.5* +1.3 4.8*
Dijet
 Δη
 ATLAS_2019_I1718132 13000 4.7 +1.3 6.0
Dijet
 Δφ
 ATLAS_2019_I1718132 13000 5.2 +1.6 6.8
Dijet
 HT
 ATLAS_2019_I1718132 13000 3.6 - n/a
Jet mass
 Dijet mass
 ATLAS_2019_I1718132 13000 4.4 +4.4 8.8
Jet Shapes
 Differential Jet Shape
 ATLAS_2013_I1243871 7000 2.1 +0.20 2.3
Jet Shapes
 Integral Jet Shape
 ATLAS_2013_I1243871 7000 0.31 +0.030 0.34
Identified Particles
 E(KS0)
 ATLAS_2019_I1746286 7000 1.9 +0.20 2.1
Identified Particles
 η(KS0)
 ATLAS_2019_I1746286 7000 1.4 +0.20 1.6
Identified Particles
 pT(KS0)
 ATLAS_2019_I1746286 7000 1.8 +0.40 2.2
Identified Particles
 E(KS0) to E(jet) ratio
 ATLAS_2019_I1746286 7000 3.0 +0.40 3.4
Lepton η
 ATLAS_2019_I1759875 13000 14 -1.0 13
CMS_2018_I1703993 13000 14 0 14
Lepton pT
 ATLAS_2019_I1759875 13000 20 -2.0 18
CMS_2018_I1703993 13000 25 +1.0 26
CMS_2021_I1901295 13000 6.8 0 6.8
Identified Particles
 E(Λ0)
 ATLAS_2019_I1746286 7000 4.4 +1.3 5.7
Identified Particles
 η(Λ0)
 ATLAS_2019_I1746286 7000 0.74 +0.010 0.75
Identified Particles
 pT(Λ0)
 ATLAS_2019_I1746286 7000 5.5 +1.2 6.7
Δφ(lepton,jet)
 ATLAS_2019_I1718132 13000 6.5* +3.5 10*
Dilepton
 E
 ATLAS_2019_I1759875 13000 17 -1.0 16
Dilepton
 Δη
 CMS_2016_I1430892 8000 0.71 -0.30 0.41
CMS_2018_I1703993 13000 17 +1.0 18
Dilepton
 Δφ
 ATLAS_2019_I1718132 13000 6.1 +1.9 8.0
ATLAS_2019_I1759875 13000 12* 0 12*
CMS_2018_I1703993 13000 23 +4.0 27
Dilepton
 HT
 ATLAS_2019_I1759875 13000 17 -3.0 14
Dilepton
 m
 ATLAS_2019_I1759875 13000 16 -1.0 15
CMS_2018_I1703993 13000 23 +7.0 30
Dilepton
 pT
 ATLAS_2019_I1718132 13000 4.4 +4.7 9.1
ATLAS_2019_I1759875 13000 16 -2.0 14
CMS_2018_I1703993 13000 22 -1.0 21
Dilepton
 y
 ATLAS_2019_I1759875 13000 12 +1.0 13*
ST(leptons, jets)
 ATLAS_2019_I1718132 13000 n/a - n/a
nch
 ATLAS_2022_I2152933 13000 1.8 -0.50 1.3
Jet Multiplicities
 Extra jets multiplicity
 ATLAS_2019_I1750330 13000 n/a - n/a
ATLAS_2022_I2037744 13000 n/a - n/a
CMS_2021_I1901295 13000 12 +6.0 18
Jet Multiplicities
 Jet multiplicity
 ATLAS_2014_I1304688 7000 n/a - n/a
ATLAS_2020_I1801434 13000 3.8 +0.10 3.9
CMS_2018_I1703993 13000 21 -1.0 20
sumpt
 ATLAS_2022_I2152933 13000 3.1 -0.20 2.9
Jet Multiplicities
 Subjet multiplicity
 ATLAS_2019_I1750330 13000 n/a - n/a
Pouttop
 ATLAS_2019_I1750330 13000 3.9 +0.20 4.1
ATLAS_2020_I1801434 13000 3.2 +0.100 3.3
ATLAS_2022_I2077575 13000 4.0* -1.1 2.9
Top pT
 ATLAS_2019_I1750330 13000 3.4* 0 3.4
ATLAS_2020_I1801434 13000 2.6 +0.40 3.0
ATLAS_2022_I2037744 13000 0.37 +1.5 1.9
ATLAS_2022_I2077575 13000 2.0* +0.10 2.1*
CMS_2018_I1703993 13000 30 +2.0 32
CMS_2021_I1901295 13000 11* +2.0 13*
top.pt.ttbarRF
 CMS_2018_I1703993 13000 28 +2.0 30
pT ratio
 Top quarks
 ATLAS_2020_I1801434 13000 3.4 +0.40 3.8
Top rapidity
 ATLAS_2019_I1750330 13000 3.7 +0.60 4.3
ATLAS_2020_I1801434 13000 2.9 +0.70 3.6
ATLAS_2022_I2037744 13000 1.0 +0.40 1.4
ATLAS_2022_I2077575 13000 2.4* +0.40 2.8*
CMS_2018_I1703993 13000 26 0 26
CMS_2021_I1901295 13000 11 0 11
topej.dphi
 ATLAS_2022_I2037744 13000 2.1 +0.20 2.3
topej.m
 ATLAS_2022_I2037744 13000 0.26 +2.6 2.9
χ(ttbar)
 ATLAS_2019_I1750330 13000 4.2 +0.20 4.4
ATLAS_2020_I1801434 13000 2.8 +2.3 5.1
ATLAS_2022_I2077575 13000 2.4 +2.0 4.4*
Δφ(ttbar)
 ATLAS_2019_I1750330 13000 4.5 +0.20 4.7
ATLAS_2020_I1801434 13000 3.0 +0.20 3.2
ATLAS_2022_I2037744 13000 1.8 - n/a
ATLAS_2022_I2077575 13000 2.9 +1.3 4.2
CMS_2018_I1703993 13000 42 +3.0 45
CMS_2021_I1901295 13000 17 +1.0 18
Δy (ttbar)
 CMS_2016_I1430892 8000 0.53 -0.42 0.11
CMS_2018_I1703993 13000 26 +1.0 27
CMS_2021_I1901295 13000 9.8 +1.2 11
ttbar HT
 ATLAS_2019_I1750330 13000 3.2 +0.20 3.4
ATLAS_2020_I1801434 13000 2.3 +1.4 3.7
ATLAS_2022_I2037744 13000 0.11 - n/a
ATLAS_2022_I2077575 13000 4.2* +1.1 5.3*
CMS_2021_I1901295 13000 10 +1.0 11
m(ttbar)
 ATLAS_2019_I1750330 13000 2.9* +0.30 3.2
ATLAS_2020_I1801434 13000 2.5 +1.1 3.6
ATLAS_2022_I2037744 13000 0.49 +0.61 1.1
ATLAS_2022_I2077575 13000 1.9* +0.40 2.3*
CMS_2018_I1703993 13000 24 +4.0 28
CMS_2021_I1901295 13000 14 +2.0 16
Pcrossttbar
 ATLAS_2020_I1801434 13000 2.6 +0.20 2.8
ttbar pT
 ATLAS_2019_I1750330 13000 4.2 +0.40 4.6
ATLAS_2020_I1801434 13000 2.9 +0.30 3.2
ATLAS_2022_I2037744 13000 0.87 +2.5 3.4
ATLAS_2022_I2077575 13000 2.5* +0.30 2.8*
CMS_2018_I1703993 13000 27 0 27
CMS_2021_I1901295 13000 10 +1.0 11*
pT ratio
 ttbar to extra jet
 ATLAS_2020_I1801434 13000 2.8 +1.0 3.8
ttbar.thetaStar
 ATLAS_2022_I2077575 13000 2.6 +0.10 2.7
CMS_2021_I1901295 13000 15 +2.0 17
Ttbar rapidity
 ATLAS_2019_I1750330 13000 3.7 +0.30 4.0
ATLAS_2020_I1801434 13000 2.2* +1.4 3.6*
ATLAS_2022_I2037744 13000 0.87 -0.25 0.62
ATLAS_2022_I2077575 13000 2.4 +0.60 3.0
CMS_2018_I1703993 13000 27 -1.0 26
CMS_2021_I1901295 13000 13 +2.0 15
Mean rapidity
 ATLAS_2019_I1750330 13000 5.7 +0.30 6.0
ATLAS_2020_I1801434 13000 2.4 +1.0 3.4
ATLAS_2022_I2077575 13000 2.3 +2.6 4.9*
ttbarej.ht
 ATLAS_2022_I2037744 13000 0.63 +0.47 1.1
ttbarej.m
 CMS_2021_I1901295 13000 10 +3.0 13
pT ratio
 W to b
 ATLAS_2020_I1801434 13000 2.5 +1.9 4.4
pT ratio
 W to top
 ATLAS_2020_I1801434 13000 3.2 +0.60 3.8
Cross sections
 ATLAS_2022_I2037744 13000 0.067 +0.78 0.85
ATLAS_2022_I2077575 13000 15 +4.0 19
CMS_2019_I1753720 13000 n/a - n/a

* several "n/a" histograms were excluded from the calculation



n/a indicates that the χ2 value is unavailable, typically due to mismatched binning between theoretical and MC histograms or other issues.



The page data is based on 2224 histograms.