标题： 通过大 N_c 世界连接淬火和非淬火世界 显示英文标题

标题： Connecting the Quenched and Unquenched Worlds via the Large N_c World

摘要： 在大\(N_c\)（颜色数）极限下，淬火QCD和QCD是相同的。 这意味着，在有效场论框架内，(N_c=3)淬火QCD和QCD的一些低能常数在\(1/N_c\)展开的高阶修正中是相同的。 因此，预计在淬火近似中与\(\Delta I=1/2\)规则相关的非轻子K介子衰变计算，与未淬火的情况相比，仅相差一个\(O(1/N_c)\)修正。 然而，与CP破坏参数\(\epsilon'/\epsilon\)相关的计算会有相对较大的高阶修正，这是由于在主导阶次中有大的抵消效应。 一些重要的弱矩阵元的测量值很不精确，即使误差达到100%的结果也是有意义的。 在这种情况下，淬火计算将非常有用。 显示英文摘要

摘要： In the large N_c(number of colors) limit, quenched QCD and QCD are identical. This implies that, in the effective field theory framework, some of the low energy constants in (N_c=3) quenched QCD and QCD are the same up to higher-order corrections in the 1/N_c expansion. Thus the calculation of the nonleptonic kaon decays relevant for the Delta I=1/2 rule in the quenched approximation is expected to differ from the unquenched one by an O(1/N_c) correction. However, the calculation relevant to the CP-violation parameter epsilon'/epsilon would have a relatively big higher-order correction due to the large cancellation in the leading order. Some important weak matrix elements are poorly known that even constraints with 100% errors are interesting. In those cases, quenched calculations will be very useful.