# Problem when updated to latest Madgraph version

I was previously using MG5_aMC_v2_2_3 version, but now I have updated it to MG5_aMC_v2_6_1 version. I am getting different results for same parameters. The model I am using is the same, but in the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one I am getting error on phase space. I am not able to understand the difference.

## Question information

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- English Edit question

- Status:
- Answered

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- Last query:
- 2018-02-09

- Last reply:
- 2018-02-09

Hi,

Thanks for the information,

Could you give us all the detailed needed to reproduce such problem? Without those it is impossible to comment.

Cheers,

Olivier

PS: i.e. I would need to have the full banner of the generation and/or the proc_card, the param_card, the run_card and potentially the model if this is not one of those that can be auto-downloaed in 2.6.1

> On 26 Jan 2018, at 23:52, Animesh Chatterjee <email address hidden> wrote:

>

> New question #663643 on MadGraph5_aMC@NLO:

> https:/

>

> I was previously using MG5_aMC_v2_2_3 version, but now I have updated it to MG5_aMC_v2_6_1 version. I am getting different results for same parameters. The model I am using is the same, but in the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one I am getting error on phase space. I am not able to understand the difference.

>

> --

> You received this question notification because you are an answer

> contact for MadGraph5_aMC@NLO.

Hi,

I am generating fermionic dark matter events using p p > chi chi~ , where I consider fixed target experiment. There are two problems which I see now

1. In the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one when I assign one of the beam energy as zero, I am getting error on phase space (earlier version was MG5_aMC_v2_2_3 and new version is MG5_aMC_v2_6_1), I am using the same param_card and run_card for both the version, same model as well.

2. Theta distribution of the fermionic dark matter (for same parameters, same model and all other variables same ) for the earlier and latest version re not same.

I have attached the proc_card, the param_card, the run_card and the model herewith. Please let me know if you need more information.

Thank you for your help

Animesh

Regards

Animesh Chatterjee

Postdoctoral Research Fellow

Department of Physics

University of Texas at Arlington

_______

From: <email address hidden> <email address hidden> on behalf of Olivier Mattelaer <email address hidden>

Sent: Friday, January 26, 2018 4:57:33 PM

To: Chatterjee, Animesh

Subject: Re: [Question #663643]: Problem when updated to latest Madgraph version

Your question #663643 on MadGraph5_aMC@NLO changed:

https:/

Question #663643 : Questions : MadGraph5_aMC@NLO<https:/

answers.

I was previously using MG5_aMC_v2_2_3 version, but now I have updated it to MG5_aMC_v2_6_1 version. I am getting different results for same parameters. The model I am using is the same, but in the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one I am getting error on phase space. I am not able to understand the difference.

Status: Open => Answered

Olivier Mattelaer proposed the following answer:

Hi,

Thanks for the information,

Could you give us all the detailed needed to reproduce such problem? Without those it is impossible to comment.

Cheers,

Olivier

PS: i.e. I would need to have the full banner of the generation and/or

the proc_card, the param_card, the run_card and potentially the model if

this is not one of those that can be auto-downloaed in 2.6.1

> On 26 Jan 2018, at 23:52, Animesh Chatterjee <email address hidden> wrote:

>

> New question #663643 on MadGraph5_aMC@NLO:

> https:/

Question #663643 : Questions : MadGraph5_aMC@NLO<https:/

answers.

I was previously using MG5_aMC_v2_2_3 version, but now I have updated it to MG5_aMC_v2_6_1 version. I am getting different results for same parameters. The model I am using is the same, but in the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one I am getting error on phase space. I am not able to understand the difference.

>

> I was previously using MG5_aMC_v2_2_3 version, but now I have updated it to MG5_aMC_v2_6_1 version. I am getting different results for same parameters. The model I am using is the same, but in the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one I am getting error on phase space. I am not able to understand the difference.

>

> --

> You received this question notification because you are an answer

> contact for MadGraph5_aMC@NLO.

--

If this answers your question, please go to the following page to let us

know that it is solved:

https:/

If you still need help, you can reply to this email or go to the

following page to enter your feedback:

https:/

Question #663643 : Questions : MadGraph5_aMC@NLO<https:/

answers.

I was previously using MG5_aMC_v2_2_3 version, but now I have updated it to MG5_aMC_v2_6_1 version. I am getting different results for same parameters. The model I am using is the same, but in the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one I am getting error on phase space. I am not able to understand the difference.

You received this question notification because you asked the question.

Attachment does not go trough the question on launchpad.

If you want to attach document, please create a bug report.

Cheers,

Olivier

> On 9 Feb 2018, at 18:43, Animesh Chatterjee <email address hidden> wrote:

>

> Question #663643 on MadGraph5_aMC@NLO changed:

> https:/

>

> Status: Answered => Open

>

> Animesh Chatterjee is still having a problem:

> Hi,

>

>

> I am generating fermionic dark matter events using p p > chi chi~ , where I consider fixed target experiment. There are two problems which I see now

>

>

> 1. In the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one when I assign one of the beam energy as zero, I am getting error on phase space (earlier version was MG5_aMC_v2_2_3 and new version is MG5_aMC_v2_6_1), I am using the same param_card and run_card for both the version, same model as well.

> 2. Theta distribution of the fermionic dark matter (for same parameters, same model and all other variables same ) for the earlier and latest version re not same.

>

>

> I have attached the proc_card, the param_card, the run_card and the model herewith. Please let me know if you need more information.

>

>

> Thank you for your help

>

> Animesh

>

>

> Regards

> Animesh Chatterjee

> Postdoctoral Research Fellow

> Department of Physics

> University of Texas at Arlington

> _______

> From: <email address hidden> <email address hidden> on behalf of Olivier Mattelaer <email address hidden>

> Sent: Friday, January 26, 2018 4:57:33 PM

> To: Chatterjee, Animesh

> Subject: Re: [Question #663643]: Problem when updated to latest Madgraph version

>

> Your question #663643 on MadGraph5_aMC@NLO changed:

> https:/

> Question #663643 : Questions : MadGraph5_aMC@NLO<https:/

> answers.

> I was previously using MG5_aMC_v2_2_3 version, but now I have updated it to MG5_aMC_v2_6_1 version. I am getting different results for same parameters. The model I am using is the same, but in the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one I am getting error on phase space. I am not able to understand the difference.

>

>

>

> Status: Open => Answered

>

> Olivier Mattelaer proposed the following answer:

> Hi,

>

> Thanks for the information,

> Could you give us all the detailed needed to reproduce such problem? Without those it is impossible to comment.

>

> Cheers,

>

> Olivier

>

> PS: i.e. I would need to have the full banner of the generation and/or

> the proc_card, the param_card, the run_card and potentially the model if

> this is not one of those that can be auto-downloaed in 2.6.1

>

>> On 26 Jan 2018, at 23:52, Animesh Chatterjee <email address hidden> wrote:

>>

>> New question #663643 on MadGraph5_aMC@NLO:

>> https:/

> Question #663643 : Questions : MadGraph5_aMC@NLO<https:/

> answers.

> I was previously using MG5_aMC_v2_2_3 version, but now I have updated it to MG5_aMC_v2_6_1 version. I am getting different results for same parameters. The model I am using is the same, but in the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one I am getting error on phase space. I am not able to understand the difference.

>

>

>>

>> I was previously using MG5_aMC_v2_2_3 version, but now I have updated it to MG5_aMC_v2_6_1 version. I am getting different results for same parameters. The model I am using is the same, but in the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one I am getting error on phase space. I am not able to understand the difference.

>>

>> --

>> You received this question notification because you are an answer

>> contact for MadGraph5_aMC@NLO.

>

> --

> If this answers your question, please go to the following page to let us

> know that it is solved:

> https:/

>

> If you still need help, you can reply to this email or go to the

> following page to enter your feedback:

> https:/

> Question #663643 : Questions : MadGraph5_aMC@NLO<https:/

> answers.

> I was previously using MG5_aMC_v2_2_3 version, but now I have updated it to MG5_aMC_v2_6_1 version. I am getting different results for same parameters. The model I am using is the same, but in the earlier version I was able to generate events with one of the beam energy set to zero, but in the latest one I am getting error on phase space. I am not able to understand the difference.

>

>

>

> You received this question notification because you asked the question.

>

> --

> You received this question notification because you are an answer

> contact for MadGraph5_aMC@NLO.

## Can you help with this problem?

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