科研之友
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摘要
New physics in the chromomagnetic flavor changing transition s -%26gt; dg* can avoid the strong Glashow-Iliopoulos-Maiani suppression of the standard model and lead to large contributions to CP-violating observables, in particular to the epsilon %26apos; parameter, that we address here. We discuss the case of the left-right symmetric models, where this contribution implies bounds on the phases of the right-handed quark mixing matrix, or in generic models with large phases a strong bound on the left-right symmetry scale. To the leading order, a numeric formula for epsilon%26apos; as a function of the short-distance coefficients for a wide class of models of new physics is given.
- 出版日期2012-11-13
