Implications of the possibility that sin 2 beta is small - art. no. 056001

Recently, the Babar and Belle Collaborations have reported their first meas urements of the CP-violating asymmetry in B-d-->psiK(S), and more precise r esults will follow soon. We discuss what future evidence for small sin 2 be ta could mean, contrasting the usual possibility of new physics in the B-d system with the interesting alternative that the new physics effects are co nfined to the kaon system.