How can photons have no mass?

Question

Like how can any particle have no mass? Other particles like protons and electrons have mass, what’s so special about photons then?

In: Physics

Answer 1

Photons are very special.

They have no rest mass, and only exist at a very high speed, and have angular momentum even though they have no mass or width. They are also their own anti-particle, as antimatter reactions produce photons that are identical to regular matter reaction photons.