The negative-parity spin-1/2 \Lambda baryon spectrum from lattice QCD and effective theory
The negative-parity spin-1/2 \Lambda baryon spectrum from lattice QCD and effective theory
复制标题
晶格QCD的负宇称自旋1/2Lambda重子谱和有效理论
DOI：
10.1016/j.physletb.2021.136473
复制
发表时间：
2021
影响因子：
4.4
通讯作者：
Takahashi Toru T.
中科院分区：
文献类型：
--
作者：
Pavao Rafael;Gubler Philipp;Fernandez-Soler Pedro;Nieves Juan;Oka Makoto;Takahashi Toru T.
在酉化耦合通道框架中，使用晶格 QCD 和强子有效理论研究了负宇称自旋 1/2 Λ 重子的光谱。通过考虑有限体积中的强子有效理论以及与晶格研究情况相对应的强子质量和介子衰变常数，可以对两种方法进行直接比较。比较各个状态的能级谱和 S U (3) 风味分解，发现从晶格 QCD 提取的最低两个状态可以与两个 Λ (1405) 极之一和 Λ (1670) 共振相关。这两个晶格 QCD 能级的夸克质量依赖性与它们的有效理论对应物非常一致。然而，由于目前的晶格QCD研究仍然依赖三夸克算子来生成物理态，因此尚未看到有限体积有效理论计算中出现的与介子-重子散射态对应的清晰信号。
The spectrum of the negative-parity spin-1/2 Λ baryons is studied using lattice QCD and hadronic effective theory in a unitarized coupled-channel framework. A direct comparison between the two approaches is possible by considering the hadronic effective theory in a finite volume and with hadron masses and mesonic decay constants that correspond to the situation studied on the lattice. Comparing the energy level spectrum and S U (3) flavor decompositions of the individual states, it is found that the lowest two states extracted from lattice QCD can be associated with one of the two Λ (1405)-poles and the Λ (1670) resonance. The quark mass dependences of these two lattice QCD levels are in good agreement with their effective theory counterparts. However, as current lattice QCD studies still rely on three-quark operators to generate the physical states, clear signals corresponding to the meson-baryon scattering states, that appear in the finite volume effective theory calculation, are not yet seen.