Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-05-09
Phys.Lett. B513 (2001) 123-129
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 12 pages and 2 eps figures. Minor changes, paper accepted by Physics Letters B
Scientific paper
10.1016/S0370-2693(01)00666-9
Motivated by diquark exchange, we construct a class of extensions of the standard model. These models can generate large CP conserving and CP violating contributions to the doubly Cabbibo suppressed decays D^0\to K^+\pi^- without affecting D^0-\overline{D^0} mixing, contrary to what is usually believed in the literature. We find an interesting specific realization of these models, which has the LR chiral structure and can induce novel density \times density operators. It is new for non-leptonic kaon decays, and particularly, may provide a possible solution to the \Delta I=1/2 rule and direct CP violation, without inducing large flavour changing neutral currents.
D'Ambrosio Giancarlo
Gao Dao-Neng
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