Questions on reweighting for reference frames

Asked by xiao jie on 2020-07-06

Dear experts,

I am trying to use reweight method [1] to change reference frames of longitudinally polarized same-sign WW VBS:

generate p p > w+{0} w+{0} j j QED=4 QCD=0, w+ > l+ vl @ 1
add process p p > w-{0} w-{0} j j QED=4 QCD=0, w- > l- vl~ @ 2

If I use default partonic-center-of mass frame in run_card.dat. Is following the correct way to set other reference frames in reweight_card.dat?

change boost lambda part: part.pid in [24,-24] # go to the ww rest-frame
launch --rwgt_name=WW_rf
change boost lambda part: part.pid in [11,13,15, -11, -13, -15] # go to the dilepton rest-frame
launch --rwgt_name=dilepton_rf
change boost lambda part: part.pid in [1,2,3,4,5,-1,-2,-3,-4,-5] # go to the dijet rest-frame
launch --rwgt_name=dijet_rf

Thanks,
Jie
[1]https://answers.launchpad.net/mg5amcnlo/+faq/2243

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Solved by:
Olivier Mattelaer
Solved:
2020-07-10
Last query:
2020-07-10
Last reply:
2020-07-10

yes this sounds correct

I guess that in this context it does not make too much sense to use the helicity by helicity re-weighting, so be sure to turn that mode to OFF.

Cheers,

Olivier

xiao jie (talalal) said : #2

Thanks Olivier Mattelaer, that solved my question.