Testing improved staggered fermions with m_s and B_K
Fleming, George T.
Sharpe, Stephen R.
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Publisher:American Physical Society
Citation:Weonjong Lee et al, "Testing improved staggered fermions with m_s and B_K," Physical Review D 71, no. 9 (2005), doi:10.1103/PhysRevD.71.094501
We study the improvement of staggered fermions using hypercubically smeared links. We calculate the strange quark mass and the kaon B parameter, B_K, in quenched QCD on a 16^3×64 lattice at β=6.0. We find m_s(MSˉ ,2 GeV)=101.2±1.3±4 MeV and B_K(MSˉ ,2 GeV)=0.578±0.018±0.042, where the first error is from statistics and fitting, and the second from using one-loop matching factors. The scale (1/a=1.95 GeV) is set by M_ρ, and m_s is determined using the kaon mass. Comparing to quenched results obtained using unimproved staggered fermions and other discretizations, we argue that the size of discretization errors in B_K is substantially reduced by improvement.
Rights:©2005 The American Physical Society
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