- #1

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## Main Question or Discussion Point

On page 3 of the following pdf:

http://pdg.lbl.gov/2005/reviews/numixrpp.pdf

the paragraph after equation 13.12, there's a line that says:

"Thus, if U is not real, the neutrino..... When CPT holds, any difference between these probabilities indicates a violation of CP invariance."

I don't understand how it should be a violation of CP invariance, and not CPT invariance that is violated.

http://pdg.lbl.gov/2005/reviews/numixrpp.pdf

the paragraph after equation 13.12, there's a line that says:

"Thus, if U is not real, the neutrino..... When CPT holds, any difference between these probabilities indicates a violation of CP invariance."

I don't understand how it should be a violation of CP invariance, and not CPT invariance that is violated.