Generator / tune

Details for Pythia 6.427 a vs. 6.428

pp/ppbar → Top (tt)


Observable Reference Energy χ2+5% (6.427) Δ χ2+5% (6.428)
Asymmetry
 AC vs Mttbar
 CMS_2016_I1430892 8000 1.6 - n/a
Asymmetry
 AC vs pTttbar
 CMS_2016_I1430892 8000 7.4 - n/a
Asymmetry
 AC vs yttbar
 CMS_2016_I1430892 8000 0.99 - n/a
Asymmetry
 ACl vs Mttbar
 CMS_2016_I1430892 8000 0.53 - n/a
Asymmetry
 ACl vs pTttbar
 CMS_2016_I1430892 8000 0.93 - n/a
Asymmetry
 ACl vs yttbar
 CMS_2016_I1430892 8000 1.3 - n/a
Asymmetry
 Energy asymmetry
 ATLAS_2021_I1941095 13000 n/a - n/a
B jet
 η
 CMS_2018_I1703993 13000 170 -10 160
B jet
 pT
 CMS_2018_I1703993 13000 200 0 200
bjbj.m
 CMS_2018_I1703993 13000 250 0 250
bjbj.pt
 CMS_2018_I1703993 13000 220 -10 210
bjt.dphi
 ATLAS_2022_I2037744 13000 1.3 +0.100 1.4
ej.pt
 ATLAS_2022_I2037744 13000 3.2 -0.70 2.5*
pT ratio
 Extra jets
 ATLAS_2020_I1801434 13000 7.7 +0.100 7.8
pT ratio
 Extra to leading jet
 ATLAS_2020_I1801434 13000 8.0 -0.70 7.3
pT ratio
 Extra jet to Top
 ATLAS_2020_I1801434 13000 7.0 +0.100 7.1
ΔR(extra jets)
 ATLAS_2020_I1801434 13000 6.1* +0.40 6.5
ejej.dphi
 ATLAS_2022_I2037744 13000 0.58 +1.5 2.1
ejets.ht
 CMS_2021_I1901295 13000 29 0 29
ΔR(extra, leading jet)
 ATLAS_2020_I1801434 13000 7.4 -0.50 6.9
ΔR(top, extra jet)
 ATLAS_2020_I1801434 13000 6.6 +0.50 7.1
Jets + Veto
 Gap frac. vs Veto scale
 ATLAS_2012_I1094568 7000 0.14 -0.030 0.11
Jets + Veto
 Gap frac. vs scalar veto scale
 ATLAS_2012_I1094568 7000 0.072 -0.016 0.056
Jet mass
 Jet mass
 CMS_2017_I1518399 8000 61 - n/a
CMS_2019_I1764472 13000 2.9 -0.30 2.6
Jet pT
 ATLAS_2014_I1304688 7000 28 +1.0 29
ATLAS_2019_I1718132 13000 n/a - n/a
Dijet
 Δη
 ATLAS_2019_I1718132 13000 n/a - n/a
Dijet
 Δφ
 ATLAS_2019_I1718132 13000 n/a - n/a
Dijet
 HT
 ATLAS_2019_I1718132 13000 n/a - n/a
Jet mass
 Dijet mass
 ATLAS_2019_I1718132 13000 n/a - n/a
Jet Shapes
 Differential Jet Shape
 ATLAS_2013_I1243871 7000 1.2 -0.20 1.0
Jet Shapes
 Integral Jet Shape
 ATLAS_2013_I1243871 7000 0.22 0 0.22
Identified Particles
 E(KS0)
 ATLAS_2019_I1746286 7000 1.4 0 1.4
Identified Particles
 η(KS0)
 ATLAS_2019_I1746286 7000 0.82 -0.060 0.76
Identified Particles
 pT(KS0)
 ATLAS_2019_I1746286 7000 1.4 -0.20 1.2
Identified Particles
 E(KS0) to E(jet) ratio
 ATLAS_2019_I1746286 7000 1.5 +0.10 1.6
Lepton η
 ATLAS_2019_I1759875 13000 40 -4.0 36
CMS_2018_I1703993 13000 96 -2.0 94
Lepton pT
 ATLAS_2019_I1759875 13000 54 -5.0 49
CMS_2018_I1703993 13000 210 -10 200
CMS_2021_I1901295 13000 21 -4.0 17
Identified Particles
 E(Λ0)
 ATLAS_2019_I1746286 7000 5.0 -0.80 4.2
Identified Particles
 η(Λ0)
 ATLAS_2019_I1746286 7000 0.43 -0.010 0.42
Identified Particles
 pT(Λ0)
 ATLAS_2019_I1746286 7000 6.2 -1.3 4.9
Δφ(lepton,jet)
 ATLAS_2019_I1718132 13000 n/a - n/a
Dilepton
 E
 ATLAS_2019_I1759875 13000 44 -4.0 40
Dilepton
 Δη
 CMS_2016_I1430892 8000 0.61 - n/a
CMS_2018_I1703993 13000 140 -10 130
Dilepton
 Δφ
 ATLAS_2019_I1718132 13000 n/a - n/a
ATLAS_2019_I1759875 13000 32* -3.0 29*
CMS_2018_I1703993 13000 160 -10 150
Dilepton
 HT
 ATLAS_2019_I1759875 13000 46 -5.0 41
Dilepton
 m
 ATLAS_2019_I1759875 13000 46 -7.0 39
CMS_2018_I1703993 13000 170 0 170
Dilepton
 pT
 ATLAS_2019_I1718132 13000 n/a - n/a
ATLAS_2019_I1759875 13000 45 -4.0 41
CMS_2018_I1703993 13000 160 +10 170
Dilepton
 y
 ATLAS_2019_I1759875 13000 34 -3.0 31
ST(leptons, jets)
 ATLAS_2019_I1718132 13000 n/a - n/a
nch
 ATLAS_2022_I2152933 13000 11 0 11
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 42 -1.0 41
Jet Multiplicities
 Jet multiplicity
 ATLAS_2014_I1304688 7000 n/a - n/a
ATLAS_2020_I1801434 13000 9.6 -0.100 9.5
CMS_2018_I1703993 13000 180 - n/a
sumpt
 ATLAS_2022_I2152933 13000 16 -2.0 14
Jet Multiplicities
 Subjet multiplicity
 ATLAS_2019_I1750330 13000 n/a - n/a
Pouttop
 ATLAS_2019_I1750330 13000 9.4 -0.20 9.2
ATLAS_2020_I1801434 13000 6.5 0 6.5
ATLAS_2022_I2077575 13000 2.4* -0.60 1.8
Top pT
 ATLAS_2019_I1750330 13000 7.3 -0.100 7.2*
ATLAS_2020_I1801434 13000 5.7 +0.30 6.0
ATLAS_2022_I2037744 13000 2.0 -0.30 1.7
ATLAS_2022_I2077575 13000 1.5* -0.10 1.4*
CMS_2018_I1703993 13000 190 0 190
CMS_2021_I1901295 13000 36* -2.0 34*
top.pt.ttbarRF
 CMS_2018_I1703993 13000 190 0 190
pT ratio
 Top quarks
 ATLAS_2020_I1801434 13000 8.5 -1.1 7.4
Top rapidity
 ATLAS_2019_I1750330 13000 9.1 -0.50 8.6
ATLAS_2020_I1801434 13000 8.0 -0.90 7.1
ATLAS_2022_I2037744 13000 2.1 -0.70 1.4*
ATLAS_2022_I2077575 13000 1.5* +0.60 2.1*
CMS_2018_I1703993 13000 170 -10 160
CMS_2021_I1901295 13000 34 -2.0 32
topej.dphi
 ATLAS_2022_I2037744 13000 3.0 -0.20 2.8
topej.m
 ATLAS_2022_I2037744 13000 1.7 -0.40 1.3
χ(ttbar)
 ATLAS_2019_I1750330 13000 11 -1.0 10
ATLAS_2020_I1801434 13000 8.4 -1.6 6.8
ATLAS_2022_I2077575 13000 1.8 +0.20 2.0
Δφ(ttbar)
 ATLAS_2019_I1750330 13000 9.1 -0.20 8.9
ATLAS_2020_I1801434 13000 7.1 0 7.1
ATLAS_2022_I2037744 13000 2.8 -2.1 0.71
ATLAS_2022_I2077575 13000 1.4 +0.80 2.2
CMS_2018_I1703993 13000 310 +10 320
CMS_2021_I1901295 13000 50 -2.0 48
Δy (ttbar)
 CMS_2016_I1430892 8000 0.15 - n/a
CMS_2018_I1703993 13000 180 -10 170
CMS_2021_I1901295 13000 37 -5.0 32
ttbar HT
 ATLAS_2019_I1750330 13000 7.5 0 7.5
ATLAS_2020_I1801434 13000 7.0 -0.30 6.7
ATLAS_2022_I2037744 13000 4.1 - n/a
ATLAS_2022_I2077575 13000 1.8* +0.50 2.3*
CMS_2021_I1901295 13000 32 -2.0 30
m(ttbar)
 ATLAS_2019_I1750330 13000 5.6 0 5.6*
ATLAS_2020_I1801434 13000 6.9 - n/a
ATLAS_2022_I2037744 13000 1.1 -0.18 0.92
ATLAS_2022_I2077575 13000 1.4* -0.100 1.3*
CMS_2018_I1703993 13000 180 +20 200*
CMS_2021_I1901295 13000 48 -4.0 44
Pcrossttbar
 ATLAS_2020_I1801434 13000 7.5 -0.50 7.0
ttbar pT
 ATLAS_2019_I1750330 13000 8.8 -0.30 8.5
ATLAS_2020_I1801434 13000 6.4 -0.50 5.9*
ATLAS_2022_I2037744 13000 3.1 +1.4 4.5
ATLAS_2022_I2077575 13000 1.4* +0.40 1.8*
CMS_2018_I1703993 13000 220 -20 200
CMS_2021_I1901295 13000 30 -1.0 29
pT ratio
 ttbar to extra jet
 ATLAS_2020_I1801434 13000 7.2 -0.40 6.8
ttbar.thetaStar
 ATLAS_2022_I2077575 13000 2.2 -0.40 1.8
CMS_2021_I1901295 13000 49 -4.0 45
Ttbar rapidity
 ATLAS_2019_I1750330 13000 8.4 -0.100 8.3
ATLAS_2020_I1801434 13000 4.5* +0.30 4.8
ATLAS_2022_I2037744 13000 0.57 +1.7 2.3
ATLAS_2022_I2077575 13000 1.9* -0.20 1.7
CMS_2018_I1703993 13000 150 0 150
CMS_2021_I1901295 13000 45 -6.0 39
Mean rapidity
 ATLAS_2019_I1750330 13000 12 0 12
ATLAS_2020_I1801434 13000 6.1 -0.50 5.6
ATLAS_2022_I2077575 13000 2.1* -0.30 1.8
ttbarej.ht
 ATLAS_2022_I2037744 13000 4.3 -2.4 1.9
ttbarej.m
 CMS_2021_I1901295 13000 37 -3.0 34
pT ratio
 W to b
 ATLAS_2020_I1801434 13000 8.2 -1.2 7.0
pT ratio
 W to top
 ATLAS_2020_I1801434 13000 7.4 -0.80 6.6
Cross sections
 ATLAS_2022_I2037744 13000 1.8 +0.50 2.3
ATLAS_2022_I2077575 13000 5.5 +2.4 7.9
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.