WHIZARD

What is the method used for automatic decay?

Asked by Dayun Qiu

Hi,

 I'm study a new particle's decay width by using whizard3.03. I have a questions when I using whizard.

What is the calculation method of automatic decay ? Is it the Monte Carlo method or the others like the Simpson method ?

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English Edit question
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WHIZARD Edit question
Assignee:
Juergen Reuter Edit question
Solved by:
Dayun Qiu
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Juergen Reuter (j.r.reuter) said : 		#1

Hi Dayun,
by using ?auto_decays = true, Whizard will nevertheless do a Monte Carlo integration based on an adaptive (multi-)channel version,
called VAMP as a default. Whizard has the possibility to apply a numerical midpoint rule for integration of low-dimensional integrals like in 1->2. You can change to this by setting $integration_method = "midpoint".
The functional test file share/tests/functional_tests/smtest_12.sin
gives you an idea where a decay is calculated by the midpoint rule, and the production process is integrated using VAMP.
Cheers,
    JRR (Juergen)

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Dayun Qiu (dayun-sysu) said : 		#2

Thanks!