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arXiv 1612.04579hep-lathep-ph
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重叠夸克传播子的夸克手征凝聚

Quark chiral condensate from the overlap quark propagator

Chao Wang, Yujiang Bi, Hao Cai, Ying Chen, Ming Gong, Zhaofeng Liu

摘要:

从朗道规范下计算的重叠格点夸克传播子出发,通过对格点数据拟合算子乘积展开公式,确定了夸克手征凝聚。夸克传播子是在RBC-UKQCD合作组用$N_f=2+1$方法产生的畴壁费米子组态上计算的。在一个格点间距$1/a=1.75(4)$ GeV下,使用了三个不同轻海夸克质量的系综.我们得到了SU(2)手征极限下的$\langle\barψψ\rangle^{\overline{\rm MS}}(2\mbox{ GeV})=(-305(15)(21)\mbox{ MeV})^3$.

英文摘要:

From the overlap lattice quark propagator calculated in the Landau gauge, we determine the quark chiral condensate by fitting operator product expansion formulas to the lattice data. The quark propagators are computed on domain wall fermion configurations generated by the RBC-UKQCD Collaborations with $N_f=2+1$ flavors. Three ensembles with different light sea quark masses are used at one lattice spacing $1/a=1.75(4)$ GeV. We obtain $\langle\barψψ\rangle^{\overline{\rm MS}}(2\mbox{ GeV})=(-305(15)(21)\mbox{ MeV})^3$ in the SU(2) chiral limit.

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