Long-distance dimension-eight operators in B_K

Details Long-distance dimension-eight operators in B_K Long-distance dimension-eight operators in B_K

2003-03-19

arxiv.org/abs/hep-ph/0303162v3

JHEP0303:060,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, LaTeX. Explanatory comments added to match version in journal

Scientific paper

10.1088/1126-6708/2003/03/060

Besides their appearance at short distances \gtrsim 1/M_W, local dimension-eight operators also contribute to kaon matrix elements at long distances of order \gtrsim 1/mu_ope, where mu_ope is the scale controlling the Operator Product Expansion in pure QCD, without weak interactions. This comes about in the matching condition between the effective quark Lagrangian and the Chiral Lagrangian of mesons. Working in dimensional regularization and in a framework where these effects can be systematically studied, we calculate the correction from these long-distance dimension-eight operators to the renormalization group invariant B_K factor of K^0-K^0bar mixing, to next-to-leading order in the 1/Nc expansion and in the chiral limit. The correction is controlled by the matrix element <0|\bar s_L \tilde{G}_{mu nu}gamma^mu d_L|K^0>, is small, and lowers B_K.

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