Generator / tune

Pythia 8 (A2) versions validation

Versions:

2>
incl. 5% "theory uncertainty" on all points
max worst max worst max
8.306 <Δ> 8.307 <Δ> 8.308
min best min best min
pp/ppbar → 4-lepton 120 +0.96 120 +2.0 120
23 -1.0 22 +1.0 23
6.1 -1.2 5.8 -0.55 6.0
pp/ppbar → bb 28 +2.8 41 +61 100
5.1 +4.7 9.8 +3.2 13
0.20 -0.25 0.22 -0.00074 0.22
pp/ppbar → Elastic 19 -0.011 17 +3.8 21
16 -1.0 15 +2.0 17
14 -1.9 14 +0.020 14
pp/ppbar → Jets 320 +67 320 +230 390
80 -6.0 74 +96 170
0.0014 -67 0.00072 -16 0.0018
pp/ppbar → Soft QCD (inelastic) 80 +12 86 +130 220
4.1 +0.30 4.4 +1.3 5.7
0.0035 -9.3 0.0035 -3.8 0.0035
pp/ppbar → Soft QCD (nsd only) 15 +2.2 15 +2.6 15
2.6 0 2.6 0 2.6
0.033 -1.5 0.028 -0.49 0.026
pp/ppbar → Total σ 2.0 0 2.0 +0.0025 2.0
2.0 0 2.0 0 2.0
2.0 0 2.0 +0.0025 2.0
pp/ppbar → Top (t-channel) 2.5 +0.62 2.7 +0.050 2.5
0.82 +0.10 0.92 -0.090 0.83
0.017 -0.14 0.084 -0.18 0.042
pp/ppbar → Top (all) 0.99
? ? 0.63
0.18
pp/ppbar → Top (parton level)
? ? ?
pp/ppbar → Top (tt) 69 +6.7 64 +49 110
5.0 -0.20 4.8 +2.1 6.9
0.0050 -10 0.0035 -6.5 0.0054
pp/ppbar → Underlying Event 21 +1.2 20 +5.6 26
1.8 -0.40 1.4 +0.60 2.0
0.025 -1.3 0.030 -2.1 0.019
pp/ppbar → W+Jet 7.8 -0.22 7.7 +4.5 9.9
2.9 +0.20 3.1 0 3.1
0.88 -2.4 0.97 -0.30 0.41
pp/ppbar → W 28 +6.2 34 +4.4 26
4.8 +0.40 5.2 -0.10 5.1
1.1 -2.3 0.77 -7.8 1.2
pp/ppbar → WW 51 +4.5 52 +1.8 53
19 0 19 +1.0 20
0.081 -0.52 0.095 -0.72 0.11
pp/ppbar → Z+Jet 310 +72 330 +230 390
93 +7.0 100 +70 170
0.32 -65 0.44 -1.1 0.14
pp/ppbar → Z (Drell-Yan) 31 +19 32 +30 52
7.3 -0.50 6.8 +0.40 7.2
0.18 -13 0.23 -7.0 0.090

Legend: [ χ2 < 1 ] / [ 1 ≤ χ2 < 4 ] / [ 4 ≤ χ2 ]

(click on number in the table cell to see individual observables)

The page data is based on 11324 histograms.