Conservation Laws

For a particle interaction to occur the following laws must be obeyed, if either is violated the reaction will never be observed (will never happen):

Charge: Must be conserved (same total value before as the total value after)

Baryon Number: Must be conserved

Lepton Number: Must be conserved

Strangeness: Conserved in EM and Strong Interaction. Doesn’t have to be conserved in Weak Interaction