$B_K$ and Explicit Chiral Symmetry Breaking

Details $B_K$ and Explicit Chiral Symmetry Breaking $B_K$ and Explicit Chiral Symmetry Breaking

1994-09-08

arxiv.org/abs/hep-ph/9409255v2

Phys.Lett. B342 (1995) 331-338

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 postscript figures included, NORDITA-94/44 N,P. Mistake in the numerics discovered which changed some of the concl

Scientific paper

10.1016/0370-2693(94)01350-L

The $B_K$ parameter is discussed in the general context of calculating beyond the factorization approximation for hadronic matrix elements. A variant of the $1/N_c$ 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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