Nucleon strange quark content from two-flavor lattice QCD with exact chiral symmetry
Nucleon strange quark content from two-flavor lattice QCD with exact chiral symmetry
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DOI：
10.1103/physrevd.83.114506
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发表时间：
2010-11
影响因子：
5
通讯作者：
J. Takeda;S. Aoki;S. Hashimoto;T. Kaneko;J. Noaki;T. Onogi
中科院分区：
文献类型：
--
作者：
J. Takeda;S. Aoki;S. Hashimoto;T. Kaneko;J. Noaki;T. Onogi
用重叠费米子公式计算了动态点阵QCD中核子的奇异夸克含量。对于这个量，由Ginsparg-Wilson关系保证的精确手性对称对于避免由于可能的算子与$\bar{u}u+\bar{d}d$混合而造成的大污染至关重要。规范配置是在16^3 x 32的晶格上产生的两种动态风味，晶格间距为\simeq 0.12fm。我们利用全对全夸克传播子和低模平均技术直接计算了包含断开奇夸克环的晶格上的相关三点函数。我们的结果{f＿T＿s} = 0.032(8)(22)，与我们之前使用费曼-赫尔曼定理的间接估计很好地一致。
Strange quark content of the nucleon is calculated in dynamical lattice QCD employing the overlap fermion formulation. For this quantity, exact chiral symmetry guaranteed by the Ginsparg-Wilson relation is crucial to avoid large contamination due to a possible operator mixing with $\bar{u}u+\bar{d}d$. Gauge configurations are generated with two dynamical flavors on a 16^3 x 32 lattice at a lattice spacing a \simeq 0.12fm. We directly calculate the relevant three-point function on the lattice including a disconnected strange quark loop utilizing the techniques of all-to-all quark propagator and low-mode averaging. Our result f_{T_s} = 0.032(8)(22), is in good agreement with our previous indirect estimate using the Feynman-Hellmann theorem.