MadSpin thinks "qcd<=2" is particle
Hi Folks,
I have a strange MadSpin crash that might be a bug. I am generating ttbar@NLO and then decaying, but MadSpin crashes because it thinks "qcd<=2" in the proc_card is a particle. My release is 2.5.1. Details, including a solution (a hack really), are below.
Best,
Richard
1. The process is:
generate p p > t t~ QCD<=2 QED=0 [QCD]
2. For MadSpin I have:
define tt = t t~
define bb = b b~
define ww = w+ w-
define emu = e+ e- mu+ mu-
define vemu = ve ve~ vm vm~
define lj = emu vemu j
decay tt > ww bb, ww > lj lj
3. After MadSpin starts without a problem but then crashes when generating the square matrix element:
INFO: generating the production square matrix element
INFO: generate p p > t t~ QCD<=2 QED=0 --no_warning=
Command "launch " interrupted with error:
InvalidCmd : No particle qcd<=2 in model
Please report this bug on https:/
More information is found in '/.../run_
Please attach this file to your report.
4. The log file points the finger at " QCD<=2":
File "/.../madgraph/
raise self.InvalidCmd, "No particle %s in model" % part_name
InvalidCmd: No particle qcd<=2 in model
5. A quick hack is to modify the file "Cards/
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