Lattice QCD Calculation of the Kaon B Parameter with the Wilson Quark Action
- JLQCD, Collaboration
- Aoki, S
- Fukugita, M
- Hashimoto, S
- Ishizuka, N
- Iwasaki, Y
- Kurahashi, Y
- Okawa, Masanori
- Ukawa, A
- Yoshié, T
Publication date
January 1998
DOI Publisher
American Physical Society (APS) Journal
Physical Review LettersAbstract
The kaon B parameter is calculated in quenched lattice QCD with the Wilson quark action. The mixing problem of the Δs = 2 four-quark operators is solved nonperturbatively with full use of chiral Ward identities, and this method enables us to construct the weak four-quark operators exhibiting good chiral behavior. We find BK(NDR,2 GeV) = 0.69(7) (where NDR denotes naive dimensional regularization) at the lattice cutoff scale of a-1 = 2.7–4.3 GeV
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