Unquenched determination of the kaon parameter BK from improved staggered fermions

被引:28
|
作者
Gamiz, Elvira [1 ]
Collins, Sara
Davies, Christine T. H.
Lepage, G. Peter
Shigemitsu, Junko
Wingate, Matthew
机构
[1] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
[2] Cornell Univ, Lab Elementary Particle Phys, Ithaca, NY 14853 USA
[3] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[4] Univ Washington, Inst Nucl Theory, Seattle, WA 98115 USA
来源
PHYSICAL REVIEW D | 2006年 / 73卷 / 11期
关键词
D O I
10.1103/PhysRevD.73.114502
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The use of improved staggered actions (HYP, Asqtad) has been proved to reduce the scaling corrections that affected previous calculations of B-K with unimproved (standard) staggered fermions in the quenched approximation. This improved behavior allows us to perform a reliable calculation of B-K including quark vacuum polarization effects, using the MILC configurations with n(f)=2+1 flavors of sea fermions. We perform such a calculation for a single lattice spacing, a=0.125 fm, and with kaons made up of degenerate quarks with m(s)/2. The valence strange quark mass m(s) is fixed to its physical value and we use two different values of the light sea quark masses. After a chiral extrapolation of the results to the physical value of the sea quark masses, we find B boolean AND(K)=0.83 +/- 0.18, where the error is dominated by the uncertainty in the lattice to continuum matching at O(alpha(2)(s)). The matching will need to be improved to get the precision needed to make full use of the experimental data on epsilon(K) to constrain the unitarity triangle.
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页数:12
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