Does MadGraph include decay branching ratios?
Asked by
Maksym Ovchynnikov
I have a model of some scalar particle a + a mediator V coupled to the baryon current J^mu_B = sum_q bar q gamma^mu q implemented in MadGraph via FeynRules. The Lagrangian is
L = 1/3 *g *J^mu_B V_mu - g_B V^mu (a* d_mu a + a d_mu a*)
Next, I compute the production of a particle in MadGraph using
p p > V, V > a a~
fixing the V and a mass, and the coupling constant g. My question is the following. In the output, there is the corresponding cross-section.
My question is the following. How does MadGraph include the branching ratio of the decay V > a a~ in this cross-section? Does it involve the numerical value of the decay width of V written in parameters.py? P.S. I am using a very small decay width Gamma_V.
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