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Theoretical value of sin(2\beta)

  1. Feb 17, 2008 #1
    I am looking for the theoretical value of [itex]sin(2\beta)[/itex] but I just keep finding the experimental one. I supose there is a theoretical value because I have read that they choose in the BaBar experience the channel [itex]B^0\rightarrow J/\psi K^0_S[/itex] because the theoretical error for [itex]sin(2\beta)[/itex] was very small...

    Thanks for your replies.
  2. jcsd
  3. Feb 19, 2008 #2
    Ahhh... never heard about this argument....
    I thought cp phase is an input of SM. I guess it can be infered from existing measurements like K mixing via lattice QCD but that's very hard task.
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