A hyperons with kinetic energy T 320 MeV disintegrated during its flight into a neutral particle and a positive pion outgoing with kinetic energy T 42 MeV at right angles to the hyperon 's motion direction Find the rest mass of the neutral particle (in MeV units) ...

By energy conservation or or HOW 11 P P2 P P P PJP mc ...

A + hyperons with kinetic energy T = 320 MeV disintegrated during its flight into a neutral

Question:

A Σ+ hyperons with kinetic energy TΣ = 320 MeV disintegrated during its flight into a neutral particle and a positive pion outgoing with kinetic energy Tπ = 42 MeV at right angles to the hyperon's motion direction. Find the rest mass of the neutral particle (in MeV units).