# Particle physics conservation laws

1. Apr 8, 2010

### Marthius

I am working on a homework assignment for my particle physics class, and it requires I understand what forces conserve what quantum numbers. As I understand it:
Strong
Conserves Isospin, I3 projection, s, c, b, t, Baryon number, lepton flavor
E&M
Conserves I3 projection, s, c, b, t, Baryon number, lepton flavor
Can Violate Isospin
Weak
Conserves Baryon number, lepton flavor
Can Violate Isospin, I3 projection, s, c, b, t,

Please let me know if this is correct, or if I have made a mistake.