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Improved determination of B_7 and B_8
Proceedings of International Europhysics Conference on High Energy Physics — PoS(hep2001)
I report on a dispersive matrix element calculation of B 7,8 performed within a fully rigorous theoretical framework which incorporates experimental data as a central ingredient. This approach is the first to correctly implement two-loop matching of the effective theory to the dispersive description while using the same scheme dependence as the calculation of the OPE coefficients. The numerical treatment is also completely new and provides a determination of not only central values for B 7,8doi:10.22323/1.007.0225 fatcat:5l4amoaabvdcdjtgkkzrpbtqny