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arXiv 1005.5571hep-lathep-ph
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再论谱权函数的体积依赖性

More on volume dependence of spectral weight function

Zhi-Yuan Niu, De-Chuan Du, Bao-Zhong Guo, Ning Li, Chuan Liu, Hang Liu

摘要:

从两点关联函数中可以很容易地得到谱权函数,并且在有限体积格点计算中,谱权函数可以用来区分单粒子态和多粒子态,这是许多格点量子色动力学模拟中的一个关键问题。在以前的研究中,它示出了一个广泛的共振的光谱权重函数的份额的典型的体积依赖性的两个粒子散射状态,即成比例的$1/L^3$在一个大的立方体盒的大小$L$,而窄共振的情况下,需要进一步的调查。在本文中,一个普遍的公式被发现的谱权函数,其中包括窄和宽的共振情况。在Lüscher的形式主义,它表明,光谱权重函数的体积依赖性表现出单粒子行为的一个非常窄的共振和两个粒子行为的一个广泛的共振。推导了$A^+_1$和$T^-_1$通道的相应公式。文中还讨论了这些公式在共振参数提取中的潜在应用。

英文摘要:

Spectral weight functions are easily obtained from two-point correlation functions and they might be used to distinguish single-particle from multi-particle states in a finite-volume lattice calculation, a problem crucial for many lattice QCD simulations. In previous studies, it is shown that the spectral weight function for a broad resonance shares the typical volume dependence of a two-particle scattering state i.e. proportional to $1/L^3$ in a large cubic box of size $L$ while the narrow resonance case requires further investigation. In this paper, a generalized formula is found for the spectral weight function which incorporates both narrow and broad resonance cases. Within Lüscher's formalism, it is shown that the volume dependence of the spectral weight function exhibits a single-particle behavior for a extremely narrow resonance and a two-particle behavior for a broad resonance. The corresponding formulas for both $A^+_1$ and $T^-_1$ channels are derived. The potential application of these formulas in the extraction of resonance parameters are also discussed.

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