MadGraph5_aMC@NLO

EWdim6 model with pp->WZ cross section = 0

Asked by senka duric

Dear MadGraph authors,
I am using MG5 v5.2.2.3. and trying to use EWdim6 BSM model (aTGC) when generating pp->WZ events at 13TeV. Resulting cross section for SM, when setting all BSM parameters to 0, (using default run_card) is zero:

Using random number seed offset = 30
INFO: Running Survey
Creating Jobs
Working on SubProcesses
    P0_qq_wpll_wp_lvl
    P1_qq_wmll_wm_lvl
INFO: Idle: 0, Running: 10, Completed: 0 [ current time: 13h18 ]
INFO: Idle: 0, Running: 7, Completed: 3 [ 4.5s ]
INFO: Idle: 0, Running: 1, Completed: 9 [ 14.6s ]
INFO: End survey
Survey return zero cross section.
   Typical reasons are the following:
   1) A massive s-channel particle has a width set to zero.
   2) The pdf are zero for at least one of the initial state particles
      or you are using maxjetflavor=4 for initial state b:s.
   3) The cuts are too strong.
   Please check/correct your param_card and/or your run_card.

When setting all parameters to value 1 the cross section is non zero but very small: 0.000741 +- 2.246e-06 pb.
The same model seems to be working fine for pp->W+W-.
I see some information here: https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/FAQ-General-14, but in this case (pp->WZ) there is no 4 point interactions and the coupling of three vector bosons is allowed and set to SM value, it is not set to 0.
What is the cause of this problem and how to fix it? Am I missing something? Thank you in advance!

These are my commands for wz process:
import model EWdim6
generate p p > w+ l+ l-, w+ > l+ vl @0
add process p p > w- l+ l-, w- > l- vl~ @1

Greetings,
Senka

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Please read this:
https://answers.launchpad.net/mg5amcnlo/+faq/1942

The automatic assignment for this model is not working for that process.

Cheers,

Olivier
On 21 Mar 2015, at 03:11, senka duric <email address hidden> wrote:

> New question #263932 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/263932
>
> Dear MadGraph authors,
> I am using MG5 v5.2.2.3. and trying to use EWdim6 BSM model (aTGC) when generating pp->WZ events at 13TeV. Resulting cross section for SM, when setting all BSM parameters to 0, (using default run_card) is zero:
>
> Using random number seed offset = 30
> INFO: Running Survey
> Creating Jobs
> Working on SubProcesses
> P0_qq_wpll_wp_lvl
> P1_qq_wmll_wm_lvl
> INFO: Idle: 0, Running: 10, Completed: 0 [ current time: 13h18 ]
> INFO: Idle: 0, Running: 7, Completed: 3 [ 4.5s ]
> INFO: Idle: 0, Running: 1, Completed: 9 [ 14.6s ]
> INFO: End survey
> Survey return zero cross section.
> Typical reasons are the following:
> 1) A massive s-channel particle has a width set to zero.
> 2) The pdf are zero for at least one of the initial state particles
> or you are using maxjetflavor=4 for initial state b:s.
> 3) The cuts are too strong.
> Please check/correct your param_card and/or your run_card.
>
> When setting all parameters to value 1 the cross section is non zero but very small: 0.000741 +- 2.246e-06 pb.
> The same model seems to be working fine for pp->W+W-.
> I see some information here: https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/FAQ-General-14, but in this case (pp->WZ) there is no 4 point interactions and the coupling of three vector bosons is allowed and set to SM value, it is not set to 0.
> What is the cause of this problem and how to fix it? Am I missing something? Thank you in advance!
>
> These are my commands for wz process:
> import model EWdim6
> generate p p > w+ l+ l-, w+ > l+ vl @0
> add process p p > w- l+ l-, w- > l- vl~ @1
>
>
> Greetings,
> Senka
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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