issue with 4 body decay and identical particles
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
MadGraph5_aMC@NLO |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
Hi,
MG5_aMC is crashing when automatically calculation widths using the Pseudoscalar_2HDM model (*):
Command "generate_events run_01" interrupted in sub-command:
"set max_npoint_
KeyError : 2
Versions 2.8.1 and 2.8.2 seem to be affected, the same thing used to work in 2.6.7.
We are using python2.
We are essentially calling:
> import model Pseudoscalar_
> generate p p > t t~ #doesn't really matter
> output test
> launch
> done
> set Wh1 auto
> set Wh2 auto
> set Wh3 auto
> set Wh4 auto
> done
I've copied the MG5_debug at the bottom of this message (there is also a ME5_debug file which is empty).
Any help with this would be appreciated.
Cheers,
Hannes
*) https:/
---MG5_debug.log---
#******
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 2.8.2 2020-10-30 *
#* *
#* The MadGraph5_aMC@NLO Development Team - Find us at *
#* https:/
#* *
#******
#* *
#* Command File for MadGraph5_aMC@NLO *
#* *
#* run as ./bin/mg5_aMC filename *
#* *
#******
set group_subprocesses Auto
set ignore_
set max_t_for_channel 99
set loop_optimized_
set low_mem_
set default_
set zerowidth_tchannel True
set loop_color_flows False
set gauge unitary
set complex_mass_scheme False
set max_npoint_
Traceback (most recent call last):
File "/home/
return self.onecmd_
File "/home/
return func(arg, **opt)
File "/home/
switch_mode = self.ask_
File "/home/
self.
File "/home/
banner=banner)
File "/home/
cards=cards, mode=mode, **opt)
File "/home/
fct=
File "/home/
result = fct(question)
File "/home/
return self.cmdloop()
File "/home/
super(
File "/home/
stop = self.postcmd(stop, line)
File "/home/
self.
File "/home/
self.
File "/home/
out = self.mother_
File "/home/
out = cmd.exec_cmd(line, model=opts[
File "/home/
stop = Cmd.onecmd_
File "/home/
return func(arg, **opt)
File "/home/
return self.cmd.
File "/home/
self.
File "/home/
stop = Cmd.onecmd_
File "/home/
return func(arg, **opt)
File "/home/
self.
File "/home/
self.
File "/home/
return self.cmd.
File "/home/
ndiags, cpu_time = generate_
File "/home/
matrix_
File "/home/
compute_loop_nc = compute_loop_nc))
File "/home/
amplitude_tag = IdentifyMETag.
File "/home/
for p in sorted_tags[1:]]
KeyError: 2
default_
ignore_
loop_
low_mem_
max_
automatic_
cluster_
mg5amc_
Changed in mg5amcnlo: | |
status: | Fix Committed → Fix Released |
Hi,
This is clearly related to a bug that we have fixed in 2.8.1 (the bug fixing was related to identical in the final state where some diagram were not included). Looks like for your process some 4 body diagram added due to that issue have some issue with the meta-data leading to this crash.
This is likely to be quite long to fix (and I would not recommend to use older version in your case).
Cheers,
Olivier