!MadGraph5 Syntax for process generation
In MadGraph 5, most of the MG4 syntax is kept unchanged, but in MG5,
- All particles should be separated with a spaces
write this: w+ > ve e+ and not: w+>vee+
- The coupling order is specified after the process, on the same line.
Please note that:
- Note that contrary to MG4 the default coupling order is infinity
- couplings are case sensitive
write this: p p > ve e+ j j QED=2 and not: p p > ve e+ j j qed=2 qcd=99
- Other special process definition tags are the same:
- "p p > w+ > j j j" allows only diagrams with a W+ as an s-channel propagator
- "e+ e- > e+ e- / z" forbids Z to appear in any internal line in the process
- "p p > ul ul~ j $ go" forbids go to appear in any s-channel propagator
- The syntax for decay chain is different.
- In MG5 the production process is separated from the decays by a comma.
- Each subprocess (core process or decay) can have coupling orders/special tag restrictions
write this: g g > t t~ / a QED=0, (t > b W+, W+ > l+ vl), t~ >j j j QCD=0 and not: g g > (t > b (W+ > l+vl))(t~ > j j j)
Last modified
12 years ago
Last modified on Apr 6, 2012, 4:32:51 PM
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