Definitions of cuts

Asked by Sarah

Hello
I am new user of Madgraph and I have questions
can you answer my questions please,
1- I don't know what are these cuts in Madgraph pt/E/eta/dr/mij ?
2- I want to generate these processes in 2HDM type II q q~ > A > (Z* off shell ) h, Z*> e- e+ and from gluons g g~ > A > (Z* off shell ) h, Z*> e- e+.
with applying cuts on charged leptons |ηl| < 2.5 and plT > 10 GeV. my questions are
Do I have to write the full process or it is ok to write q q~or (g g~)> A > h e- e+ and Madgraph will understand there is z* ?
Also, because I don't know more about cuts, how can I apply these cuts ?

I am really Sorry if I ask questions they were answered before.

Best regards
Sarah

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Olivier Mattelaer (olivier-mattelaer) said :
#1

 1- I don't know what are these cuts in Madgraph pt/E/eta/dr/mij ?

pt: transverse momenta of the particle
E: Energy of the particle in the PARTONIC center of mass frame of the collision (not the lab frame for p p)
eta: rapidity
mij : invariant mass cut between two particles

2- I want to generate these processes in 2HDM type II q q~ > A > (Z* off shell ) h, Z*> e- e+ and from gluons g g~ > A > (Z* off shell ) h, Z*> e- e+.

Here it is difficult to know for me the exact syntax that you want since I do not know the model and the hyppothesis that you can use for your process.
I would do
generate p p > A, A > h e+ e-
or
generate p p > A, A > Z > h e+ e-
if you want (and can) to force the presence of a S-channel Z in the A onshell decay. (Please check the gauge invariance and lorentz invariance when you use such dangerous syntax).

To apply cuts, you have to defined those in the file run_card.dat.
Be carefull about the cut_decays parameter and be sure to have it set on True otherwise since your electron came from the onshell decay of the "A", your cut will not be applied.

Cheers,

Olivier

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Sarah (sarahwarad) said :
#2

thank you Olivier
I noticed there is no A particle in the 2HDM particles. is it h1?

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Olivier Mattelaer (olivier-mattelaer) said :
#3

I guess it does depend of the 2hdm model that you use. I can only suggest you to check the model reference paper.

Cheers,

Olivier

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Sarah (sarahwarad) said :
#4

(Here it is difficult to know for me the exact syntax that you want since I do not know the model and the hyppothesis that you can use for your process.)

I meant 2HDM model

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Olivier Mattelaer (olivier-mattelaer) said :
#5

I guess that you mean this one then:
http://feynrules.irmp.ucl.ac.be/wiki/2HDM

Since if i do
import model 2HDM I see:
MG5_aMC>import model 2HDM
INFO: download model from http://feynrules.irmp.ucl.ac.be/raw-attachment/wiki/2HDM/2HDM_UFO.tar.gz

Cheers,

Olivier

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