Try It Yourself! #

Here are some other interesting quantum phenomenea, try to draw the Feynman Diagram for each one of them!

Pair production #

Did you know that particles can pop out of nowhere? Sometimes, the energy from photons can be converted to the formation of an electron and an positron, and this is known as pair production.

The equation of the interaction is: $$ \gamma \to e^- + e^+ $$ The $\gamma$ refers to photon, and it uses it’s energy to form an electron ($e^-$) and a positron ($e^+$).

Try to draw the Feynman Diagram for this interaction!

Compton Scattering #

Compton scattering is the scattering of a photon by an electron. In other words, when a photon ‘hits’ a electron, they undergo inelastic collision, and the photon transfers some momentum and energy to the electron. (sounds familiar? You have seen something similar earlier!)

Try to draw the Feynman Diagram for this interaction!

Beta-Plus Decay #

We’ve seen Beta-Decay, but there’s also another form of Beta Decay! In this version, a proton converts to a neutron, a positron and a neutrino. As the proton is uud while the neutron is udd, the actual interaction only involves an up quark changing to a down quark. The equation is given as: $$ u \to d + e^+ + v $$ where $v$ represents the neutrino ejected.

Try to draw the Feynman Diagram for this interaction!