BK and Explicit Chiral Symmetry Breaking
Johan Bijnens, Joaquim Prades
Abstract
The BK parameter is discussed in the general context of calculating beyond the factorization approximation for hadronic matrix elements. A variant of the 1/Nc method of Bardeen et al. is used. We present calculations within a low energy approach and a calculation within the Nambu--Jona-Lasinio model. Matching with the QCD behaviour and dependence on non-zero current quark masses is studied.
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