MadGraph5_aMC@NLO

Single top production error

Asked by Sunidhi

I'm trying to simulate single top production channel. I'm sharing steps:
generate p p > t z j j
INFO: Checking for minimal orders which gives processes.
INFO: Please specify coupling orders to bypass this step.
INFO: Trying coupling order WEIGHTED<=5: WEIGTHED IS QCD+2*QED
INFO: Trying coupling order WEIGHTED<=6: WEIGTHED IS QCD+2*QED
INFO: Trying coupling order WEIGHTED<=7: WEIGTHED IS QCD+2*QED
INFO: Trying process: g g > t z g u~ WEIGHTED<=8 @1
INFO: Trying process: g g > t z g c~ WEIGHTED<=8 @1
INFO: Trying process: g u > t z u u~ WEIGHTED<=8 @1
INFO: Trying process: g u > t z u c~ WEIGHTED<=8 @1
INFO: Trying process: g u > t z c u~ WEIGHTED<=8 @1
INFO: Trying process: g u > t z c c~ WEIGHTED<=8 @1
INFO: Trying process: g u > t z d d~ WEIGHTED<=8 @1
INFO: Trying process: g u > t z d s~ WEIGHTED<=8 @1
INFO: Trying process: g u > t z s d~ WEIGHTED<=8 @1
INFO: Trying process: g u > t z s s~ WEIGHTED<=8 @1
INFO: Trying process: g c > t z u c~ WEIGHTED<=8 @1
INFO: Trying process: g c > t z c c~ WEIGHTED<=8 @1
INFO: Trying process: g c > t z d d~ WEIGHTED<=8 @1
INFO: Trying process: g c > t z d s~ WEIGHTED<=8 @1
INFO: Trying process: g c > t z s d~ WEIGHTED<=8 @1
INFO: Trying process: g c > t z s s~ WEIGHTED<=8 @1
Command "generate p p > t z j j " interrupted in sub-command:
"generate p p > t z j j" with error:
NoDiagramException : No amplitudes generated from process Process: g/u/c/d/s/u~/c~/d~/s~ g/u/c/d/s/u~/c~/d~/s~ > t z g/u/c/d/s/u~/c~/d~/s~ g/u/c/d/s/u~/c~/d~/s~ WEIGHTED=8 @1. Please enter a valid process

Why it is showing this error? Please tell me how can I do this.

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Solved by:
Sunidhi
Solved:
Last query:
Last reply:
Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#1

This process is indeed impossible in a 4 massless flavor model.
You need to use a model with 5 massless flavor to be able to have such type of diagram since you need to have b in the initial state and in your massless jet definition.
import model sm-no_b_mass
generate p p > t z j j

Cheers,

Olivier

Revision history for this message
Sunidhi (sunidhi112) said : 		#2

Thanks Olivier.