Please check that widths of final state particles (e.g. top) have been set to 0 in the param_card.dat

Hi,
can you send/upload the cards (proc/param/run) that you use for the run?
Thanks!

Marco

Hi Marco,

Thanks for taking the query. May I know how do I upload those files here? there is no upload button. Or do you prefer to send those files via email?

Thanks,

Siew Yan

yes, send them to me, please
Cheers,
M
On 07 Jul 2016, at 17:17, Siew Yan HOH <email address hidden> wrote:

> Question #296108 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/296108
>
> Siew Yan HOH posted a new comment:
> Hi Marco,
>
> Thanks for taking the query. May I know how do I upload those files
> here? there is no upload button. Or do you prefer to send those files
> via email?
>
> Thanks,
>
> Siew Yan
>
> --
> You received this question notification because you are subscribed to
> the question.

Hi Marco,

Please find the information in the attachments.

Let me know if you need more information.

Thanks!

Cheers,

Siew Yan

On 07/07/2016, 5:22 PM, "marco zaro" <<email address hidden> on behalf of <email address hidden>> wrote:

>Your question #296108 on MadGraph5_aMC@NLO changed:
>https://answers.launchpad.net/mg5amcnlo/+question/296108
>
> Status: Needs information => Answered
>
>marco zaro proposed the following answer:
>yes, send them to me, please
>Cheers,
>M
>On 07 Jul 2016, at 17:17, Siew Yan HOH <email address hidden> wrote:
>
>> Question #296108 on MadGraph5_aMC@NLO changed:
>> https://answers.launchpad.net/mg5amcnlo/+question/296108
>>
>> Siew Yan HOH posted a new comment:
>> Hi Marco,
>>
>> Thanks for taking the query. May I know how do I upload those files
>> here? there is no upload button. Or do you prefer to send those files
>> via email?
>>
>> Thanks,
>>
>> Siew Yan
>>
>> --
>> You received this question notification because you are subscribed to
>> the question.
>
>--
>If this answers your question, please go to the following page to let us
>know that it is solved:
>https://answers.launchpad.net/mg5amcnlo/+question/296108/+confirm?answer_id=2
>
>If you still need help, you can reply to this email or go to the
>following page to enter your feedback:
>https://answers.launchpad.net/mg5amcnlo/+question/296108
>
>You received this question notification because you asked the question.

no attachment… send it to
<email address hidden>
On 07 Jul 2016, at 17:32, Siew Yan HOH <email address hidden> wrote:

> Question #296108 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/296108
>
> Status: Answered => Open
>
> Siew Yan HOH is still having a problem:
> Hi Marco,
>
> Please find the information in the attachments.
>
> Let me know if you need more information.
>
> Thanks!
>
> Cheers,
>
> Siew Yan
>
>
>
> On 07/07/2016, 5:22 PM, "marco zaro" <<email address hidden> on behalf of <email address hidden>> wrote:
>
>> Your question #296108 on MadGraph5_aMC@NLO changed:
>> https://answers.launchpad.net/mg5amcnlo/+question/296108
>>
>> Status: Needs information => Answered
>>
>> marco zaro proposed the following answer:
>> yes, send them to me, please
>> Cheers,
>> M
>> On 07 Jul 2016, at 17:17, Siew Yan HOH <email address hidden> wrote:
>>
>>> Question #296108 on MadGraph5_aMC@NLO changed:
>>> https://answers.launchpad.net/mg5amcnlo/+question/296108
>>>
>>> Siew Yan HOH posted a new comment:
>>> Hi Marco,
>>>
>>> Thanks for taking the query. May I know how do I upload those files
>>> here? there is no upload button. Or do you prefer to send those files
>>> via email?
>>>
>>> Thanks,
>>>
>>> Siew Yan
>>>
>>> --
>>> You received this question notification because you are subscribed to
>>> the question.
>>
>> --
>> If this answers your question, please go to the following page to let us
>> know that it is solved:
>> https://answers.launchpad.net/mg5amcnlo/+question/296108/+confirm?answer_id=2
>>
>> If you still need help, you can reply to this email or go to the
>> following page to enter your feedback:
>> https://answers.launchpad.net/mg5amcnlo/+question/296108
>>
>> You received this question notification because you asked the question.
>
> --
> You received this question notification because you are subscribed to
> the question.

Thanks marco zaro, that solved my question.

Dear Marco,

Thanks for the explanation/suggestion! I have tried with the suggested prescription and it indeed work. On the other hand, since i am doing merging (FxFx) on the NLO process with definition of j = p, during event generation I was prompted to do the showering on the generated LHE in order to acquire accurate physics. Usually, I generate the LHE in standalone madgraph program, later the LHE is then hadronize/shower by a gen-fragment in CMSSW environment in order to obtain the EDM format root file. It occur odd to me that i need to do showering twice in this case. In light of accurate physics description, should I proceed with showering twice ?

Looking forward to hear from you.

Thanks very much!

Cheers,

Siew Yan

Hi,
i don’t understand: why do you need to shower twice? what happens when you shower just once?
Cheers,

Marco
On 11 Jul 2016, at 18:17, Siew Yan HOH <email address hidden> wrote:

> Question #296108 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/296108
>
> Siew Yan HOH posted a new comment:
> Dear Marco,
>
> Thanks for the explanation/suggestion! I have tried with the suggested
> prescription and it indeed work. On the other hand, since i am doing
> merging (FxFx) on the NLO process with definition of j = p, during event
> generation I was prompted to do the showering on the generated LHE in
> order to acquire accurate physics. Usually, I generate the LHE in
> standalone madgraph program, later the LHE is then hadronize/shower by a
> gen-fragment in CMSSW environment in order to obtain the EDM format root
> file. It occur odd to me that i need to do showering twice in this case.
> In light of accurate physics description, should I proceed with
> showering twice ?
>
> Looking forward to hear from you.
>
> Thanks very much!
>
> Cheers,
>
> Siew Yan
>
> --
> You received this question notification because you are subscribed to
> the question.

Hi Marco,

Allow me to explain more detail on the issue, during the user interface session, we usually greeted with the table show below. I turned off the shower option, later the next menu presented was accompanied with a WARNING message which is what concerned me.

For the moment i have generated the NLO sample without shower within madgraph and it was fine during the hadronization/showering in CMSSW via gen-fragment. I am uncertain should i proceed with showering supplied by madgraph as advised by the warning message...

Looking forward to hear from you. Thanks!!

Cheers,

Siew Yan

INFO: Enter mode value: noshower. Go to the related mode
The following switches determine which operations are executed:
 1 Perturbative order of the calculation: order=NLO
 2 Fixed order (no event generation and no MC@[N]LO matching): fixed_order=OFF
 3 Shower the generated events: shower=OFF
 4 Decay particles with the MadSpin module: madspin=OFF
 5 Add weights to the events based on changing model parameters: reweight=Not available (requires NumPy)
  Either type the switch number (1 to 5) to change its default setting,
  or set any switch explicitly (e.g. type 'order=LO' at the prompt)
  Type '0', 'auto', 'done' or just press enter when you are done.
 [0, 1, 2, 3, 4, auto, done, order=LO, order=NLO, ... ][60s to answer]
>
INFO: will run in mode: noshower

WARNING: You have chosen not to run a parton shower. NLO events without showering are NOT physical.
Please, shower the Les Houches events before using them for physics analyses.

Do you want to edit a card (press enter to bypass editing)?
  1 / param : param_card.dat
  2 / run : run_card.dat
 you can also
   - enter the path to a valid card or banner.
   - use the 'set' command to modify a parameter directly.
     The set option works only for param_card and run_card.
     Type 'help set' for more information on this command.
   - call an external program (ASperGE/MadWidth/...).
     Type 'help' for the list of available command
 [0, done, 1, param, 2, run, enter path][60s to answer]

Dear Siew Yan,
now i understand your question.
So, MG5_aMC@NLO provides an internal way to steer the shower simulations so that one can shower .lhe events. However, one can use other ways to steer the shower (provided one sets some parameters to the correct value in the shower input files, see here
http://amcatnlo.web.cern.ch/amcatnlo/list_detailed2.htm#showersettings), such as the dedicated softwares used by experiments, and CMSSW is one of these. What the warning tells you is that, unlike at LO, where in principle you could do parton-level (ie without shower) analyses of the event file, at NLO this would lead to unphysical results because of the details of the MC@NLO matching.
So one should (either with the internal way of MG5_AMC or with external softwares) always run the parton shower on the event files.

Let us know if there is something unclear!

Cheers,

Marco

Dear Marco,

Thanks for the explanation. It does help to clear my doubt.

Since you are familiar with my study from the beginning, i would like to report another problem which i have encountered in the study. During the NLO generation at the compiling state i have received error message:

Exception: program /home/centos/DM_simp/MG5_aMC_v2_3_3_modified/bin/NLO_Scalar/SubProcesses/P1_gg_xdxdxbbxg/ajob1 27 F 0 0 launch ends with non zero status: 137. Stop all computation

I will send the ME5_DEBUG to your email. Would you help me to take a look on how to resolve this.

Thanks!

Cheers,

Siew Yan