Anomalous dimensions of four-quark operators in the large N_f limit

Details Anomalous dimensions of four-quark operators in the large N_f limit Anomalous dimensions of four-quark operators in the large N_f limit

1997-10-28

arxiv.org/abs/hep-ph/9710503v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, LaTex, two figures

Scientific paper

The anomalous dimensions of four-quark operators $(\bar q_i q_j)_{V-A} (\bar q_k q_l)_{V-A}$ are calculated in the large $N_f$ limit. As expected, the result is a convergent series without renormalon ambiguities. Using the approximation of "Naive Nonabelianization", an additional all-order contribution to the anomalous dimension matrix is obtained which is somewhat larger than the exact NLO correction itself. Possible phenomenological applications in nonleptonic B decays and $B^0 - \bar B^0$ mixing are briefly considered.

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