Small fraction of unstable PS points
Hello,
I've generated gridpacks for the process
p p > a a a [QCD] @0 ; p p > a a a j [QCD] @1
using model loop_sm-no_b_mass
and with ickkw = 3 (FXFX merging)
After the processing finished I get a report that includes 30 not rescued unstable points, here is the output
Summary:
Process p p > a a a [QCD] @0 ; p p > a a a j [QCD] @1
Run at p-p collider (6500.0 + 6500.0 GeV)
Total cross-section: 1.528e+01 +- 3.2e-02 pb
Number of events generated: 1500
Parton shower to be used: PYTHIA8
Fraction of negative weights: 0.16
Total running time : 893h 11m
Number of loop ME evaluations (by MadLoop): 2283614
Stability unknown: 0
Stable PS point: 2238954
Unstable PS point (and rescued): 44630
Unstable PS point (and not rescued): 30
Only double precision used: 2238954
Quadruple precision used: 44660
Initialization phase-space points: 0
Reduction methods used:
> CutTools (double precision) 2107218
> IREGI 131736
> CutTools (quadruple precision) 44630
> Not identified (CTModeRun != -1) 30
Total number of unstable PS point detected: 30 (0.00%)
Maximum fraction of UPS points in channel processtmp/
It points to the log file SubProcesses/
===== EPS # 1 =====
mu_r = 45.740862420486629
alpha_S = 0.14866301770815049
MadLoop return code, pole check and accuracy reported 420 F 1.1236056751862
helicity (MadLoop only) 0 1
1/eps**2 expected from MadFKS= -1.685008435712
1/eps**2 obtained in MadLoop = -2.371475569269
1/eps expected from MadFKS= -8.053583864549
1/eps obtained in MadLoop = -6.954174389229
finite obtained in MadLoop = 2.0706916949898
Accuracy estimated by MadLop = 1.1236056751862
1 0.4862241351519
2 0.4862241351519
3 0.1865762650149
4 0.4008930101650
5 0.1156730895634
6 0.2693059055602
I understand from other posts that it is probably OK to use this gridpack, so I post this for your information, but please let me know if not.
Question information
- Language:
- English Edit question
- Status:
- Solved
- Assignee:
- Valentin Hirschi Edit question
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