MadGraph sometimes crashes during automatic width computation
Dear MadGraph experts,
I am studying an extension of the SM introducing an additional scalar sector. The automatic width computation sometimes causes MadGraph to crash when running compute_widths. The crash only occurs when calculating three-body decays, although there are certain particle masses for which the three-body decays are calculated as expected.
The error message is the following:
Command "generate_events run_01" interrupted in sub-command:
"set nlo_mixed_expansion True" with error:
ValueError : -24 is not in list
I am appending the MG5_debug file at the end of this post.
I have checked that this error occurs in MadGraph versions 3.3.1, 3.3.0 and 2.9.7.
I would be thankful for any help.
Leonard
#******
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 3.3.0 2021-11-12 *
#* *
#* 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 low_mem_
set complex_mass_scheme False
set include_
set gauge unitary
set loop_optimized_
set loop_color_flows False
set max_npoint_
set default_
set max_t_for_channel 99
set zerowidth_tchannel True
set nlo_mixed_expansion True
Traceback (most recent call last):
File "/home/
me_index = amplitude_
ValueError: [False, 0, False, 2, 0, [array('H', [2, 0, 1, 0, 1, 3]), array('H', [2, 3, 0, 1, 0, 1])], [(((((0, 0, 3, None, True, False, 'mdl_MW', 'mdl_WW', 1), 2),), (((0, 0, 3, None, True, False, 'mdl_MW', 'mdl_WW', 1), 4),)), (((1, 1, False, 'mdl_MS12', 'mdl_WS12', 6100003), (((0, 0), 'GC_36'), ((0, 1), 'GC_37'), '1 ', 'VVS1', 'VVS2', 'QED')),); 1, (((1, 0, 1, None, False, False, 'mdl_MS11', 'mdl_WS11', 1), 1),), (((0, 0, 3, None, False, False, 'mdl_MW', 'mdl_WW', 1), 3),)), (((((0, 0), 'GC_45'), ((0, 1), 'GC_48'), '1 ', 'VSS1', 'VSS2', 'QED'),),); 3, (((((1, 0, 1, None, False, False, 'mdl_MS11', 'mdl_WS11', 1), 1),), (((0, 0, 3, None, True, False, 'mdl_MW', 'mdl_WW', 1), 2),)), (((3, 1, True, 'mdl_MZ', 'mdl_WZ', 23), (((0, 0), 'GC_28'), '1 ', 'VVS1', 'QED')),); 1, (((0, 0, 3, None, True, False, 'mdl_MW', 'mdl_WW', 1), 4),), (((0, 0, 3, None, False, False, 'mdl_MW', 'mdl_WW', 1), 3),)), (((((0, 6), 'GC_60'), ((0, 7), 'GC_59'), '1 ', 'VVV1', 'VVV2', 'VVV3', 'VVV4', 'VVV5', 'VVV6', 'VVV7', 'VVV8', 'QED'),),); 3, (((((1, 0, 1, None, False, False, 'mdl_MS11', 'mdl_WS11', 1), 1),), (((0, 0, 3, None, True, False, 'mdl_MW', 'mdl_WW', 1), 3),)), (((3, 1, True, 'mdl_MZ', 'mdl_WZ', 23), (((0, 0), 'GC_28'), '1 ', 'VVS1', 'QED')),); 1, (((0, 0, 3, None, True, False, 'mdl_MW', 'mdl_WW', 1), 2),), (((0, 0, 3, None, False, False, 'mdl_MW', 'mdl_WW', 1), 4),)), (((((0, 6), 'GC_60'), ((0, 7), 'GC_59'), '1 ', 'VVV1', 'VVV2', 'VVV3', 'VVV4', 'VVV5', 'VVV6', 'VVV7', 'VVV8', 'QED'),),); 3]] is not in list
During handling of the above exception, another exception occurred:
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/
self.
File "/home/
out = ask(question, '0', possible_answer, timeout=
File "/home/
question_
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/
self.
File "/home/
self.
File "/home/
matrix_
File "/home/
self.
File "/home/
wf, wf_number = wf.check_
File "/home/
self.
File "/home/
index = mother_
ValueError: -24 is not in list
default_
ignore_
include_
loop_
low_mem_
max_
automatic_
acknowledged
cluster_
mg5amc_
Question information
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