Are all of the quantum numbers of anti-particles opposite

[Radiohannah]

Hey

Just wondering-

Are all of the quantum numbers of anti-particles opposite to their corresponding particle quantum numbers?

I know that lepton numbers are opposite for particles and anti particles
As is charge...

But what about the quantum numbers like strangeness, spin, parity etc etc?

Are they opposite too?

Cheers

 

[Meir Achuz]

Hey
But what about the quantum numbers like strangeness, spin, parity etc etc?

S is opposite.
Spin and spin projection doesn't change.
Parity is defined for the particle-antiparticle pair for fermions.
It is negative for fermion-antifermion,
Parity of an antiboson is the same as for the boson.

 

[blechman]

i suppose the correct statement would be "antiparticles have negative INTERNAL quantum numbers". Here, the word "INTERNAL" means not spacetime.

Examples of "internal QN": electric charge, strangeness, baryon number...

Examples of "spacetime QN": mass, momentum, helicity...

 

[Radiohannah]

that's cleared a lot up, thanks guys :-)