MadGraph5_aMC@NLO

single top tW production

Asked by Juhi Dutta

Hi,

I am trying to generate the tW(upto 3 j) single top production channel .However the process stops after few runs.

I am using the following commands :

import sm-no_b_mass
define p = p b b~
define j = j b b~
define tp = t t~
define ws = w+ w-
generate p p > tp ws @0
add process p p > tp ws j @1
add process p p > tp ws j j @2
add process p p > tp ws j j j @3

For matching I set the ickkw = 1 , xqcut = 20 ,maxjetflavour = 5 ,auto_pt_mjj = False in run_card.dat and add in add QCUT = 20 , SHOWERKT = T in the pythia card (keeping MPI on and MSTP(61) = 2) .

I instruct the code to run 10 times using a script however the process runs upto 3-4 times and then stops. I have checked it few more times but am facing the same error .

Is there an error in my process or commands? Kindly advise me in this regard.

Looking forward to your help .

Regards,

Juhi

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

I guess that you refer to the multi_run command?

Do you use the latest version?

What is the reason (error/warning message) when it stops?

Cheers,

Olivier

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Juhi Dutta (dutta-juhi91) said : 		#2

Hi,

No i am using a for loop in a shell script. I am using MG5_aMC_v2_2_3 .The run justs halts in between in Running Pythia stage.

This is the link to the pythia log. It ends abruptly. Please take a look.

https://www.dropbox.com/s/5mxc22103m6fs9o/tag_1_pythia.log?dl=0

Regards,

Juhi

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#3

Hi,

I can see two scenario:
1) a critical bug inside pythia stops the full computation.
2) you hit some limitation of your computer/cluster which kills the jobs.

Since the pythia old do not report anything weird at all, I would favour the second.
For the second you should discuss with your local IT team. My only suggestion is to use screen if you run via ssh.
Actually since I’m not a pythia author, I can not help you with the first one either.

Cheers,

Olivier

On 16 Jun 2015, at 04:17, Juhi Dutta <email address hidden> wrote:

> Question #268141 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/268141
>
> Status: Needs information => Open
>
> Juhi Dutta gave more information on the question:
> Hi,
>
> No i am using a for loop in a shell script. I am using MG5_aMC_v2_2_3
> .The run justs halts in between in Running Pythia stage.
>
> This is the link to the pythia log. It ends abruptly. Please take a
> look.
>
> https://www.dropbox.com/s/5mxc22103m6fs9o/tag_1_pythia.log?dl=0
>
> Regards,
>
> Juhi
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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