Kinematic differences with respect to older madgraph version

Asked by Garrett on 2018-06-05

This is a follow-up from https://answers.launchpad.net/mg5amcnlo/+question/663643

Testing this script on Madgraph version 2_2_3 and 2_6_2 yields different kinematics

> import model_v4 DarkPhoDM
> generate p p > chi chi~
> output
> launch
> set pdlabel cteq6l1
> set fixed_ren_scale True
> set fixed_fac_scale True
> set scale 11.188
> set dsqrt_q2fact1 11.188
> set dsqrt_q2fact2 11.188
> set ebeam1 0.938272
> set ebeam2 120.000000
> set vpmass 3.000000
> set chimass 1.000000
> set mguser 1 0.010000
> set mguser 2 0.500000

Theta distribution between the versions
https://www.dropbox.com/s/uvzm8unzz2h7tl5/OldNew.png?dl=0

The model
https://www.dropbox.com/s/sbekuayekalgd1a/DarkPhoDM.tar.gz?dl=0

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
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Last query:
2018-06-05
Last reply:
2018-06-08

Hi,

Thanks for reporting.
This is actually an old bug that we fixed in 2016. The new curve is the correct one.

Cheers,

Olivier

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