MadGraph5_aMC@NLO

Decay width computation

Asked by ouseph cj

Dear Madgraph Experts,

This is a question regarding the decay width computation using Madgraph.

Suppose if I want to compute the decay with of the following process,

n1 > z vl, where n1 is a HNL.

What would be the values ebeam1 and ebeam2?

Best
Ouseph

Question information

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

Hi,

Those parameters are ignored so you can put any value that you want.

Cheers,

Olivier

Revision history for this message
ouseph cj (ouseph444) said : 		#2

Thanks Olivier Mattelaer, that solved my question.

Revision history for this message
Gloria Shane (achariahson9) said : 		#3

I'm reading Thomson, Modern Particle Physics, and in chapter 16 author says that the decay width of the Z boson is ΓZ=2.452±0.0023GeV. He also says the total width of the decay is the sum of the partial widths,
ΓZ=Γee+Γμμ+Γττ+Γhadrons+Γνeνe+Γνμνμ+Γντντ,
https://www.hairstylenext.com/
But I still am struggling to understand the language here. My questions are:
 What do we mean by the decay width?

Why is it given in energy units (instead of a fraction of seconds, say)?

I know these questions may sound very naive, but I want to make sure I get the basics of the terminology.