MadGraph5_aMC@NLO

asymmetry in gluon quark interaction?

Asked by LIGANG XIA

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

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MadGraph5_aMC@NLO Edit question
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Solved by:
Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

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

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LIGANG XIA (xialigang) said : 		#2

Dear Olivier,

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

Cheers,
Ligang

Revision history for this message
LIGANG XIA (xialigang) said : 		#3

Thanks Olivier Mattelaer, that solved my question.