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CP Violation by A. I. Sanda, I. I. Bigi

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15

The strong CP problem

Old problems (like old soldiers) never die – they just fade away

 

 

15.1 The problem

It is often listed among the attractive features of QCD that it ‘naturally’ conserves baryon number, flavour, parity and CP. This had been the consensus for some time - until it was pointed out [223] that it is not quite true.1

Let us go back to the QCD Lagrangian given in Eq. (8.9) and note that we can add a term constructed out of the field strength tensor defined in Eq. (8.10): image henceforth to be denoted by image. It is gauge invariant and ...

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