Why is it necessary to use Monte Carlo methods in high energy physics?(adsbygoogle = window.adsbygoogle || []).push({});

There is Feynman calculus to evaluate matrix elements for various interactions and the relativistic Fermi's Golden Rule for decays and scattering to obtain a decay width or differential cross section.

What are we missing that forces us to use Monte Carlo methods to obtain numerical results instead of having functional forms for distributions?

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# Monte Carlo in high energy physics

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