# What does a Feynman diagram show?

## What does a Feynman diagram show?

A Feynman diagram is a diagram that shows what happens when elementary particles collide. Feynman diagrams are used in quantum mechanics. A Feynman diagram has lines in different shapes—straight, dotted, and squiggly—which meet up at points called vertices. The vertices are where the lines begin and end.

### What is neutrino theory of beta decay?

In a beta decay, a neutron (made of one up quark and two down quarks) can transform into a proton (made of two up quarks and one down quark), an electron, and an electron antineutrino. This reaction can happen in a neutron within an atom or a free-floating neutron.

What are the 6 steps in the Feynman method?

The Feynman Technique

1. Pretend to teach a concept you want to learn about to a student in the sixth grade.
2. Identify gaps in your explanation. Go back to the source material to better understand it.
3. Organize and simplify.
4. Transmit (optional).

Is neutron beta decay still a V-a theory?

Like muon decay, the theory of neutron beta decay based on the Feynman diagram of gure 3 is still a V-A theory and produces surprisingly good results. However, a moresophisticated theory will take into consideration the observed generational mixing ofquarks associated with the weak interaction.

## What is the RST theory of beta decay?

The rst theory of neutron beta decay was developed by Enrico Fermi in 1933. Hisapproach was a design similar to the radiation theory of light, where light quanta areemitted from an excited atom. The theory could be described as a point-like fourfermion vertex similar to the one shown in gure 1, and inclusive of the emission of.

### Is it possible to apply neutrino theory to muon decay?

neutrino1. In general, the theory could be applied to any nucleus but it was alsopossible to apply it directly to either neutron beta decay or muon decay.

How do you calculate the decay rate of a muon?

To use this amplitude to calculate the decay rate of the muon requires a calculationof which is an average over initial spin of the muon of and a sum overover nal spins of outgoing particles. Using trace theorems, and assuming masslessneutrinos, one nds.