Natural Science Forum / Physics / Research / May 2008

Hello Group,
it is known that the anomalous electric dipole moment is violating P-
symmetry. I wonder whether adding the term describing Pauli
interaction of anomalous magnetic dipole moment with electromagnetic
field  to the Dirac's lagrangean density violates any of C, P or T -
symmetries? (Of course I remember that it should be  CPT invariant, so
if it violates any, it necessarily violates two of them :))

I took the term:
     bar{psi} (i/2)[gamma ^nu, gamma ^lambda] psi
(I've used common notation: psi's are Dirac's spinors, gamma's are
dirac's matrices)

transformed it and got that it:
- changes its sign under charge conjugation
- behaves like tensor under parity transformation and time reversal.
We know how electromagnetic field tensor F_{nu lambda} behaves under
those transformations so I got the finall result that the full
interaction term:

     bar{psi} (miu/2) (i/2)[gamma ^nu, gamma ^lambda] F_{nu lambda}
psi
remains invariant. (miu is particle's magnetic moment)
Am I right?
Wish to hear any comments;
magda