B0-B(-)0 mixing beyond factorization in QCD sum rules |
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Authors: | Körner J G Onishchenko A I Petrov A A Pivovarov A A |
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Affiliation: | Institut für Physik, Johannes-Gutenberg-Universit?t, Staudinger Weg 7, D-55099 Mainz, Germany. |
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Abstract: | We present a calculation of the B0-B(-)0 mixing matrix element in the framework of QCD sum rules for three-point functions. We compute alpha(s) corrections to a three-point function at the three-loop level in QCD perturbation theory, which allows one to extract the matrix element with next-to-leading order (NLO) accuracy. This calculation is imperative for a consistent evaluation of experimentally measured mixing parameters since the coefficient functions of the effective Hamiltonian for B0-B(-)0 mixing are known at NLO. We find that radiative corrections violate factorization at NLO; this violation is under full control and amounts to 10%. The resulting value of the B parameter is found to be B(B)(m(b))=1+0.1(PT)-0.05(non-PT). |
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