Gold-plated mode reexamined:sin(2β)andB0J/ΨKSin the standard model

Abstract
We study the corrections to the determination of sin(2 beta) from the time dependent CP asymmetry of B^0 to J/Psi K_S which arise in the standard model. Although a precise prediction of these corrections is not possible we find that they are indeed extremely small, of the order of less than a per mil of the observed value. This means in turn that any deviation visible at the B factories will be a clear signal for new physics.Comment: 15 pages, 4 postscript figure
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