- #1
rashida564
- 220
- 6
- TL;DR Summary
- Two photons travels perpendicular to each other find their invariant mass
I think since Esystem=(PsystemC)^2 + (Minvariant C^2)^2. Then the invariant mass of the system should be zero, but I am hesitated with this is it always the case that photon that travels perpendicular to each other have zero invariant mass