Resonance Parameters of the rho-Meson from Lattice QCD

Resonance Parameters of the rho-Meson from Lattice QCD
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DOI:
10.1103/physrevd.83.094505
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发表时间:
2010-11
期刊:
影响因子:
5
通讯作者:
Xu Feng;K. Jansen;D. Renner
Xu Feng;K. Jansen;D. Renner
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xu Feng;K. Jansen;D. Renner

文献摘要

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我们使用两种类型的最大扭曲质量费米子(在 480 MeV 到 290 MeV 的 π 介子质量范围内)对 rho-介子衰变通道中的 P 波介子-介子散射相进行非微扰晶格计算。利用有限尺寸方法,我们评估了质心坐标系和两个移动坐标系中的π介子-π介子散射相位。应用有效范围公式,我们很好地描述了散射相位作为覆盖谐振区域的能量的函数的结果。这使我们能够提取罗介子质量和衰变宽度并研究它们的夸克质量依赖性。
We perform a non-perturbative lattice calculation of the P-wave pion-pion scattering phase in the rho-meson decay channel using two flavors of maximally twisted mass fermions at pion masses ranging from 480 MeV to 290 MeV. Making use of finite-size methods, we evaluate the pion-pion scattering phase in the center-of-mass frame and two moving frames. Applying an effective range formula, we find a good description of our results for the scattering phase as a function of the energy covering the resonance region. This allows us to extract the rho-meson mass and decay width and to study their quark mass dependence.