MadGraph5_aMC@NLO

Different decay of the same particle

Asked by 1911226481

A process such as p p > z z h j j ， I want one z decay into e- e+ ，and another decay into j j
I use generate p p > z z h j j , h > b b , z > e+ e- , z > j j .
but I find that there are no e+ e- in some process.Some process only have jet.
So how can I let one z decay into e+ e- ,another decay into j j

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

Your syntax is actually correct and this is a bug of our code.
I have check both our LTS and 3.x version and both have such issue (which is likely present since a very long time).

One workaround is to handle the decay of the Higgs via the madspin (with spinmode=none).
so for example the following script:

generate p p > z z h j j , z > e+ e- , z > j j
output
launch
madspin=none
decay h > b b~

Will try to check what is the issue....

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Olivier Mattelaer (olivier-mattelaer) said : 		#2

Hi,

The issue can also be solved by using this syntax:
p p > z z h j j , z > e+ e- , z > j j, h > b b

Indeed the code is confused due to your different ordering in the production and the decay.
I have implemented an additional check for this simple case of out of order syntax, but the simplest is indeed to just change your syntax.

Cheers,

Olivier

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