Possible Implications of Small or Large CP Violation in B^0_d vs \bar{B}^0_d --> J/ψK_S Decays

Details Possible Implications of Small or Large CP Violation in B^0_d vs \bar{B}^0_d --> J/ψK_S Decays Possible Implications of Small or Large CP Violation in B^0_d vs \bar{B}^0_d --> J/ψK_S Decays

2000-08-02

arxiv.org/abs/hep-ph/0008018v2

High Energy Phys.Nucl.Phys.26:197-200,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTex 7 pages. The title is slightly changed and the text is rewritten to include the latest BaBar and Belle data

Scientific paper

We argue that a small or large CP-violating asymmetry {\cal A}_{\psi K_S} in B^0_d vs \bar{B}^0_d --> J/\psi K_S decays, which seems to be favored by the recent BaBar or Belle data, might hint at the existence of new physics in B^0_d - \bar{B}^0_d mixing. We present a model-independent framework to show how new physics in B^0_d - \bar{B}^0_d mixing modifies the standard-model CP-violating asymmetry {\cal A}^{\rm SM}_{\psi K_S}. We particularly emphasize that an experimental confirmation of {\cal A}_{\psi K_S} \approx {\cal A}^{\rm SM}_{\psi K_S} must not imply the absence of new physics in B^0_d - \bar{B}^0_d mixing.

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