Theoretical uncertainty in sin 2beta: An update
  The source of theoretical uncertainty in the extraction of sin 2beta from the measurement of the golden channel Bd -> J/psi K0 is briefly reviewed. An updated estimate of this uncertainty based on SU(3) flavour symmetry and the measurement of the decay Bd -> J/psi pi0 is also presented. 
Marco Ciuchini, Maurizio Pierini and Luca Silvestrini
hep-ph