t1 t1~ a returns zero cross section
Bug #1424077 reported by
Nadja Strobbe
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
MadGraph5_aMC@NLO |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
Dear authors,
We are trying to generate the following process using the latest MG5_aMC@NLO version (2_2_2 or 2_2_3)
import model mssm
p p > t1 t1~ a
The generation of events fails with "Survey returns zero cross section".
When we try the same thing with an older version (I tried 2_1_1), things work without problem, which seems to suggest a bug in the newer versions.
You can find all cards on the following github page:
https:/
Cheers,
Nadja
Changed in mg5amcnlo: | |
status: | New → Fix Committed |
Changed in mg5amcnlo: | |
status: | Fix Committed → Fix Released |
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Hi,
Thanks for the report. I think that I have identified the line which make the computation to crash.
I’m discussing with the author of those modification to ensure that the fix will work.
In the meantime it is enough to change the line
1d5 = eamax ! maximum E for the photons
to
-1 = eamax ! maximum E for the photons
Cheers,
Olivier
On 20 Feb 2015, at 22:03, Nadja Strobbe <email address hidden> wrote:
> Public bug reported: /github. com/Saptaparna/ LowPtSUSYAnalys is/tree/ master/ ForNadja /bugs.launchpad .net/bugs/ 1424077 /github. com/Saptaparna/ LowPtSUSYAnalys is/tree/ master/ ForNadja /bugs.launchpad .net/mg5amcnlo/ +bug/1424077/ +subscriptions
>
> Dear authors,
>
> We are trying to generate the following process using the latest
> MG5_aMC@NLO version (2_2_2 or 2_2_3)
>
> import model mssm
> p p > t1 t1~ a
>
> The generation of events fails with "Survey returns zero cross section".
>
> When we try the same thing with an older version (I tried 2_1_1), things
> work without problem, which seems to suggest a bug in the newer
> versions.
>
> You can find all cards on the following github page:
> https:/
>
>
> Cheers,
> Nadja
>
> ** Affects: mg5amcnlo
> Importance: Undecided
> Status: New
>
> --
> You received this bug notification because you are subscribed to
> MadGraph5_aMC@NLO.
> https:/
>
> Title:
> t1 t1~ a returns zero cross section
>
> Status in MadGraph5_aMC@NLO Generator:
> New
>
> Bug description:
> Dear authors,
>
> We are trying to generate the following process using the latest
> MG5_aMC@NLO version (2_2_2 or 2_2_3)
>
> import model mssm
> p p > t1 t1~ a
>
> The generation of events fails with "Survey returns zero cross
> section".
>
> When we try the same thing with an older version (I tried 2_1_1),
> things work without problem, which seems to suggest a bug in the newer
> versions.
>
> You can find all cards on the following github page:
> https:/
>
>
> Cheers,
> Nadja
>
> To manage notifications about this bug go to:
> https:/