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CP violation and allowed interactions

  1. Dec 25, 2015 #1
    Hi,

    My question about CP- violation, but it has many parts, so I appreciate any help about..

    First: I know that, any complex coupling leads to CP - violation, so if for example A is a complex scalar, and H is a real scalar, interaction as: A HH will be forbidden if we considered CP conservation, but what about H A A, will it be allowed ?

    Second: I read that ## ^{(1)} ## there is no coupling as : Z A A, because CP–invariance im-
    plies that the two Higgs bosons must have an opposite parity. I don't understand why cp -invariance implies that ?

    And what about a coupling to a gluon as: G S S ( consider S is a coloured cp- odd or cp- even scalar), will it be allowed ? I mean is there in the strong interactions CP - invariance or violation (since CP- violation observed only in the EW interactions )

    Bests,
    s

    (1) " arXiv:hep-ph/0503173v2 ", Sec. 1.2.3,
     
  2. jcsd
  3. Dec 29, 2015 #2
    Hi!

    Before trying to answer (I am also not an expert but I am trying to learn this stuff my self), I am confused by your question.

    You say that any complex coupling generates CP violation. What do you mean? A complex coupling constant, say 'g'? Or a vertex which contains a complex field? The you say that AHH would be forbidden for this reason (because there is one complex field???), and you ask whether HAA would be forbidden. You mean HA*A I guess...

    Second, you say " Z A A, because CP–invariance implies that the two Higgs bosons must have an opposite parity"

    Where is the Higgs boson here? Are you assuming a CP odd Higgs boson?
     
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