从格点QCD探索强子宇称破坏的新方法
Exploring a new approach to Hadronic Parity Violation from Lattice QCD
AI总结:
本文提出一种基于宇称偶4夸克算符核子矩阵元并结合PCAC与手征微扰论的新数值方法,在2+1+1味扭曲质量费米子格点上计算宇称奇异的π-核子耦合$h^1_π$,得到裸耦合值$8.08(98)\cdot 10^{-7}$。
摘要:
单π交换产生的长程、宇称奇异的核子相互作用被包含在宇称奇异的π-核子耦合$h^1_π$中。其在格点QCD中的计算需要计算4夸克算符核子3点函数。我们研究了一种计算$h^1_π$的新数值方法,该方法基于宇称偶的4夸克算符的核子矩阵元,并通过PCAC和手征微扰论与宇称破坏的电弱理论相联系。本研究使用2+1+1动力学味道的扭曲质量费米子,π介子质量为$m_π \approx 260\\,\text{MeV}$,格点盒子尺寸为$L \approx 3 \\,\text{fm}$,格距为$a \approx 0.091 \\,\text{fm}$。通过排除费米子圈图的计算,我们得到裸耦合$h^1_π= 8.08 \\,(98) \cdot 10^{-7}$。
英文摘要:
The long-range, parity-odd nucleon interaction generated by single pion exchange is captured in the parity-odd pion-nucleon coupling $h^1_π$. Its calculation in lattice QCD requires the evaluation of 4-quark operator nucleon 3-point functions. We investigate a new numerical approach to compute $h^1_π$ based on nucleon matrix elements of parity-even 4-quark operators and related to the parity-violating electro-weak theory by PCAC and chiral perturbation theory. This study is performed with 2+1+1 dynamical flavors of twisted mass fermions at pion mass $m_π \approx 260\,\text{MeV}$ in a lattice box of $L \approx 3 \,\text{fm} $ and with a lattice spacing of $a \approx 0.091 \,\text{fm}$. From a calculation excluding fermion loop diagrams we find a bare coupling of $h^1_π= 8.08 \,(98) \cdot 10^{-7}$.
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