# Theoretical value of sin(2\beta)

1. Feb 17, 2008

### Magister

I am looking for the theoretical value of $sin(2\beta)$ 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 $B^0\rightarrow J/\psi K^0_S$ because the theoretical error for $sin(2\beta)$ was very small...