摘要: The theoretical picture of K and D decays is reviewed in order to explain why large enhancements are not expected in D decays. This expectation is contrasted with the available data on lifetimes and semileptonic branching ratios, ... 展开 The theoretical picture of K and D decays is reviewed in order to explain why large enhancements are not expected in D decays. This expectation is contrasted with the available data on lifetimes and semileptonic branching ratios, which hint at large enhancements but are still ambiguous. Some of the theoretical ideas proposed to explain the enhancement of D exp 0 , and possibly F exp + nonleptonic decays are discussed. One of these, together with data presented earlier, suggests a way to detect the F exp + and a possible gluonium state in one fell swoop. New data on D implies rhoK/ pi K have implications for models which predict large nonleptonic enhancements from decays into exclusive final states. These are discussed. (ERA citation 05:029795) 收起