$η'$ - $η_c$ -混合改进的随机估计
$η'$-$η_c$-mixing with improved stochastic estimators
摘要：
Charmonia是味单线态介子，因此原则上来自断开的夸克线图的贡献可能会直接或通过与其他味单线态通道混合来影响它们的质量。我们提出了第一项研究，考虑到这两种影响。我们采用改进的随机所有到所有的传播技术（包括新的方法）来计算的$η'$和$η_c$之间的混合矩阵内出现的图。运行最初进行$N_f=2$ $16^3\times 32$配置与非微扰改进Sheikholeslami-Wilson行动，无论是价和海夸克。
英文摘要：
Charmonia are flavour singlet mesons and thus in principle contributions from disconnected quark line diagrams might affect their masses, either directly or via mixing with other flavour singlet channels. We present a first study that takes both effects into account. We employ improved stochastic all-to-all propagator techniques (including new methods) to calculate the diagrams that appear within the mixing matrix between the $η'$ and the $η_c$. The runs are initially performed on $N_f=2$ $16^3\times 32$ configurations with the non-perturbatively improved Sheikholeslami-Wilson action, both for valence and sea quarks.
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