CP Asymmetry in B_d --> phi K_S: Standard Model Pollution

Abstract

The difference in the time dependent CP asymmetries between the modes $B-->psi{K}_S$ and $B-->phi{K}_S$ is a clean signal for physics beyond the Standard Model. This interpretation could fail if there is a large enhancement of the matrix element of the $b-->uubars$ operator between the $B_d$ initial state and the $phi{K}_S$ final state. We argue against this possibility and propose some experimental tests that could shed light on the situation.

9 pages, Revtex

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