We show that, unlike other pure b → d penguin processes, the decay BS0(t) → φKS is dominated by a single amplitude, that of the internal t-quark. The contributions of the u- and c-quark operators each vanish due to a cancellation between the (V - A) ⊗ (V - A) and (V - A) ⊗ (V + A) matrix elements. Thus, the indirect CP asymmetry in this decay probes sin 2β. Although this cancellation is complete only for certain values of the s- and b-quark masses, the theoretical uncertainty on sin 2β is still less than 10% over most (∼ 80%) of the parameter space. By measuring the direct CP asymmetry, one can get a better idea of the probable error on sin 2β.
|Number of pages||9|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2001 May 17|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics