B_K in the chiral limit within the 1/Nc expansion
Abstract
Description
I report on a recent calculation done in collaboration with E. de Rafael (hep-ph/0006146 v3) of the invariant B_K factor of K-Kbar mixing in the chiral limit and to next-to- leading order in the 1/Nc expansion. This calculation is, to the best of our knowledge, the first example of a calculation of B_K in which there is an explicit analytic cancellation of the mu renormalization scale and the scheme dependence between the Wilson coefficient and the corresponding kaon matrix element. I try to emphasize the ideas involved in the approach and how the method could be applied to other physical situations, rather than the details of the numerical analysis for which I refer the reader to the above reference.
9 pages, 1 figure. Latex file. Hadronic function includes now triple pole terms which results in an improved interpolation. Slight change in final numerical result
9 pages, 1 figure. Latex file. Hadronic function includes now triple pole terms which results in an improved interpolation. Slight change in final numerical result