asymmetry in gluon quark interaction?

Asked by LIGANG XIA on 2020-11-28

Dear MG group,

 I am generating " g u > b W+, W+ > l+ vl" events using the model "sm-ckm". I tried to construct the rapidity of the final state, eta(bjet+lepton+missing transverse energy), and observed that the distribution is asymmetric (it seems not due to statistical fluctuation.). I am wondering whether the following two processes are different or not. Could you please confirm?

g u > b W+
u g > b W+

Best regards,
Ligang

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Solved by:
Olivier Mattelaer
Solved:
2020-11-30
Last query:
2020-11-30
Last reply:
2020-11-28

Indeed g u > b W+
means that the gluon is coming with positive pz momenta and the up quark will have negative pz momenta.
adding u g > b W+
will add the symmetric contribution

Cheers,

Olivier

LIGANG XIA (xialigang) said : #2

Dear Olivier,

 Thank you very much for confirming. My problem is solved.

Cheers,
Ligang

LIGANG XIA (xialigang) said : #3

Thanks Olivier Mattelaer, that solved my question.