"No amplitudes" error when setting MadSpin spinmode to full

Asked by Chris on 2017-07-31

I am using a Pseudoscalar_2HDM model to simulate dark matter + Z production, p p > xd xd~ z and then decaying the Z boson using MadSpin.
When MadSpin spinmode is set to full, it fails with the error:
"NoDiagramException: No amplitudes generated from process Process: g/d/u/s/c/d~/u~/s~/c~ g/d/u/s/c/d~/u~/s~/c~ > xd/xd~ xd/xd~ z WEIGHTED=12 @1. Please enter a valid process"

However, when spinmode is set to none, MadSpin executes without errors?

Do you know what causes this error, and how can I run in full spinmode?

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Last query:
2017-07-31
Last reply:
2017-07-31

Can you send me (via my email) your model and your cards.
Like this I do not see any reason why this happens (but if you use a very old version of the code)

Cheers,

Olivier

> On 31 Jul 2017, at 17:14, Chris <email address hidden> wrote:
>
> New question #654302 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/654302
>
> I am using a Pseudoscalar_2HDM model to simulate dark matter + Z production, p p > xd xd~ z and then decaying the Z boson using MadSpin.
> When MadSpin spinmode is set to full, it fails with the error:
> "NoDiagramException: No amplitudes generated from process Process: g/d/u/s/c/d~/u~/s~/c~ g/d/u/s/c/d~/u~/s~/c~ > xd/xd~ xd/xd~ z WEIGHTED=12 @1. Please enter a valid process"
>
> However, when spinmode is set to none, MadSpin executes without errors?
>
> Do you know what causes this error, and how can I run in full spinmode?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Chris (christopher-anelli) said : #2

Hi Olivier,

Thank you for your prompt response, I am not sure of your email so please
confirm that you receive this message.

I am running in MadGraph version 5.2.4.3, here are copies of the model,
cards, logfile, and debug file.

Best

Chris

On Mon, Jul 31, 2017 at 8:48 AM, Olivier Mattelaer <
<email address hidden>> wrote:

> Your question #654302 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/654302
>
> Status: Open => Answered
>
> Olivier Mattelaer proposed the following answer:
> Can you send me (via my email) your model and your cards.
> Like this I do not see any reason why this happens (but if you use a very
> old version of the code)
>
> Cheers,
>
> Olivier
>
> > On 31 Jul 2017, at 17:14, Chris <email address hidden>
> wrote:
> >
> > New question #654302 on MadGraph5_aMC@NLO:
> > https://answers.launchpad.net/mg5amcnlo/+question/654302
> >
> > I am using a Pseudoscalar_2HDM model to simulate dark matter + Z
> production, p p > xd xd~ z and then decaying the Z boson using MadSpin.
> > When MadSpin spinmode is set to full, it fails with the error:
> > "NoDiagramException: No amplitudes generated from process Process:
> g/d/u/s/c/d~/u~/s~/c~ g/d/u/s/c/d~/u~/s~/c~ > xd/xd~ xd/xd~ z WEIGHTED=12
> @1. Please enter a valid process"
> >
> > However, when spinmode is set to none, MadSpin executes without errors?
> >
> > Do you know what causes this error, and how can I run in full spinmode?
> >
> > --
> > 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://answers.launchpad.net/mg5amcnlo/+question/654302/+
> confirm?answer_id=0
>
> 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/654302
>
> You received this question notification because you asked the question.
>

Hi,

Your process is a loop-induced processes. MadSpin does not support loop-induced processes.
(This is actually why we introduced the mode spinmode none in order to still be able to decay such type of process)

Cheers,

Olivier

> On 31 Jul 2017, at 18:14, Chris <email address hidden> wrote:
>
> Question #654302 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/654302
>
> Status: Answered => Open
>
> Chris is still having a problem:
> Hi Olivier,
>
> Thank you for your prompt response, I am not sure of your email so please
> confirm that you receive this message.
>
> I am running in MadGraph version 5.2.4.3, here are copies of the model,
> cards, logfile, and debug file.
>
> Best
>
> Chris
>
> On Mon, Jul 31, 2017 at 8:48 AM, Olivier Mattelaer <
> <email address hidden>> wrote:
>
>> Your question #654302 on MadGraph5_aMC@NLO changed:
>> https://answers.launchpad.net/mg5amcnlo/+question/654302
>>
>> Status: Open => Answered
>>
>> Olivier Mattelaer proposed the following answer:
>> Can you send me (via my email) your model and your cards.
>> Like this I do not see any reason why this happens (but if you use a very
>> old version of the code)
>>
>> Cheers,
>>
>> Olivier
>>
>>> On 31 Jul 2017, at 17:14, Chris <email address hidden>
>> wrote:
>>>
>>> New question #654302 on MadGraph5_aMC@NLO:
>>> https://answers.launchpad.net/mg5amcnlo/+question/654302
>>>
>>> I am using a Pseudoscalar_2HDM model to simulate dark matter + Z
>> production, p p > xd xd~ z and then decaying the Z boson using MadSpin.
>>> When MadSpin spinmode is set to full, it fails with the error:
>>> "NoDiagramException: No amplitudes generated from process Process:
>> g/d/u/s/c/d~/u~/s~/c~ g/d/u/s/c/d~/u~/s~/c~ > xd/xd~ xd/xd~ z WEIGHTED=12
>> @1. Please enter a valid process"
>>>
>>> However, when spinmode is set to none, MadSpin executes without errors?
>>>
>>> Do you know what causes this error, and how can I run in full spinmode?
>>>
>>> --
>>> 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://answers.launchpad.net/mg5amcnlo/+question/654302/+
>> confirm?answer_id=0
>>
>> 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/654302
>>
>> 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?

Provide an answer of your own, or ask Chris for more information if necessary.

To post a message you must log in.