zero cross section for e+ e- > u u~
Hi,
I am new user to MadGraph5_
generate e+ e- > u u~
output
launch
parton
The result cross section is zero:
INFO: Update the dependent parameter of the param_card.dat
WARNING: Failed to update dependent parameter. This might create trouble for external program (like MadSpin/shower/...)
Generating 10000 events with run name run_01
survey run_01
INFO: compile directory
compile Source Directory
Using random number seed offset = 21
INFO: Running Survey
Creating Jobs
Working on SubProcesses
INFO: P1_ll_qq
INFO: Idle: 0, Running: 0, Completed: 0 [ current time: 22h34 ]
INFO: Idle: 0, Running: 0, Completed: 0 [ current time: 22h34 ]
INFO: End survey
refine 10000
Creating Jobs
INFO: Refine results to 10000
INFO: Generating 10000.0 unweigthed events.
INFO: Effective Luminosity 1.2e+103 pb^-1
INFO: need to improve 0 channels
Survey return zero cross section.
Typical reasons are the following:
1) A massive s-channel particle has a width set to zero.
2) The pdf are zero for at least one of the initial state particles
or you are using maxjetflavor=4 for initial state b:s.
3) The cuts are too strong.
Please check/correct your param_card and/or your run_card.
Zero result detected: See https:/
What happened here?
Thanks a lot.
Best wishes,
Da Liu
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