MadGraph5_aMC@NLO

a problem about single top process matching

Asked by KP.Xie

Hi,

I met a problem when trying to do matching in the standard model p p > t j process. The code I used is

>import model sm-no_b_mass
>generate p p > t j @1
>add process p p > t j j @2
>output SM_pp_tj

and then I launched, and selected delphes->on. The parton level process was calculated correctly, however, when parton showering pythia8 saids

Command "generate_events " interrupted with error:
Exception : program /Users/kpxie/Documents/HEP_Tools/MG5_aMC_v2_6_3_2/SM_pp_tj/Events/run_02/PY8_parallelization/run_PY8.sh 0 launch ends with non zero status: 139. Stop all computation
Please report this bug on https://bugs.launchpad.net/mg5amcnlo
More information is found in '/Users/kpxie/Documents/HEP_Tools/MG5_aMC_v2_6_3_2/SM_pp_tj/run_02_tag_1_debug.log'.
Please attach this file to your report.
quit

I don't know why. I tested MG_2.6.3.2, MG_2.6.2, and MG_2.5.5, and they yielded the same result. My computer is MacBook Pro with OS 10.13.4. Would you please help me? Thanks!

Best,
Ke-Pan Xie

Question information

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Solved by:
Rui Zhang
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Revision history for this message
Best Rui Zhang (ruirui) said : 		#1

just set JetMatching:nJetMax = 2 in "pythia8_card.dat".

I notice that pythia8 automatically set it to 1.

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#2

You should probably also set
JetMatching:nJetMin to 1 in that case,

Olivier

On 23 Aug 2018, at 14:17, Rui Zhang <<email address hidden><mailto:<email address hidden>>> wrote:

JetMatching:nJetMax

Revision history for this message
KP.Xie (kpxie) said : 		#3

Hi Rui and Olivier,

Thanks for the quick reply! I tried the method of Rui (物理), and that works. But the jet min matching order yielded a warning as follows:
>set JetMatching:nJetMin = 1
 WARNING: invalid set command JetMatching:nJetMin = 1

I don't know why.

Best,
Ke-Pan

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#5

Mg5amc does not know that py8 parameter and therefore you can not use that syntax for the edition of the py8 card.

You can edit the card manually or specify the card that you want to edit
Set pythia8 JetMatching:nJetMin = 1

Cheers

Olivier

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________________________________
From: <email address hidden> <email address hidden> on behalf of KP.Xie <email address hidden>
Sent: Friday, August 24, 2018 1:02:40 AM
To: Olivier Mattelaer
Subject: Re: [Question #672638]: a problem about single top process matching

Question #672638 on MadGraph5_aMC@NLO changed:
https://answers.launchpad.net/mg5amcnlo/+question/672638

KP.Xie posted a new comment:
Hi Rui and Olivier,

Thanks for the quick reply! I tried the method of Rui (物理), and that works. But the jet min matching order yielded a warning as follows:
>set JetMatching:nJetMin = 1
 WARNING: invalid set command JetMatching:nJetMin = 1

I don't know why.

Best,
Ke-Pan

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You received this question notification because you are an answer
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Revision history for this message
KP.Xie (kpxie) said : 		#6

Hi Olivier,

Thanks for the reply! I have checked it.

Best,
Ke-Pan

Revision history for this message
KP.Xie (kpxie) said : 		#7

Thanks Rui Zhang, that solved my question.