Abstract

Recent measurements of the time-dependent CP asymmetry of the $\stackrel{\ensuremath{\rightarrow}}{B}\ensuremath{\varphi}{K}_{S}$ decay give results whose central values differ from standard model expectations. It is shown how such data can be used to identify new physics contributions in a model-independent manner. In general, a sizable new amplitude with nontrivial weak and strong phases would be required to explain current data. An improvement in the quality of data will allow one to form a more definite conclusion.

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