Kaon B parameter from improved staggered fermions in N(f)=2+1 QCD

We present a calculation of the kaon B parameter B(K) using lattice QCD. We use improved staggered valence and sea fermions, the latter generated by the MILC Collaboration with N(f)=2+1 light flavors. To control discretization errors, we use four different lattice spacings ranging down to a≈0.045 fm...

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Bibliographic Details
Published in:Physical review letters 2012-07, Vol.109 (4), p.041601-041601
Main Authors: Bae, Taegil, Jang, Yong-Chull, Jung, Chulwoo, Kim, Hyung-Jin, Kim, Jangho, Kim, Jongjeong, Kim, Kwangwoo, Kim, Sunghee, Lee, Weonjong, Sharpe, Stephen R, Yoon, Boram
Format: Article
Language:English
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Summary:We present a calculation of the kaon B parameter B(K) using lattice QCD. We use improved staggered valence and sea fermions, the latter generated by the MILC Collaboration with N(f)=2+1 light flavors. To control discretization errors, we use four different lattice spacings ranging down to a≈0.045 fm. The chiral and continuum extrapolations are done using SU(2) staggered chiral perturbation theory. Our final result is B(K)=0.727±0.004(stat)±0.038(syst), where the dominant systematic error is from our use of truncated (one-loop) matching factors.
ISSN:1079-7114