Strange behaviour with mother-daughter relation

[Eric Conte]

Hi Eric,

I used some scripts from Stephanie and found a strange behavior when
trying to plot a light jet coming from the initial quark. She encouraged
me to write to you with this issue.
When I try to plot the light jet coming from the initial light quark it
will only give me positive eta values. Having a look at the lhe file one
can see that it has both positive and negative z momentum. It seems that
the second mother is not checked in the right way (?). Including the
gluon, which is the first mother, gives me the expected distribution.
I attach a lhe file and a minimal working example as well as a pdf
document with an example plot and the feynman diagram of the process.

Cheers

Daniel

[Eric Conte (eric-conte)]

Hi Daniel,

Sorry to reply so lately. I was stuck with other priorities in MA5 development and your problem needed a detailed investigation. In fact, the '<' keyword has been designed to specify a mother particle in a particle decay. In your script, you use it to determine if a given particle is coming from the interaction between the initial parton. This case was not covered.

Nonetheless, I have extended the code in the view to have your code run properly. I have committed this patch in MA5_1.6beta branches.

Cheers,
Eric from the MA5 team