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arXiv 1907.01237hep-lat
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$N_f=2+1+1$格点量子色动力学中的强子-强子相互作用:$ρ$共振

Hadron-Hadron Interactions from $N_f=2+1+1$ Lattice QCD: The $ρ$-resonance

Markus Werner, Martin Ueding, Christopher Helmes, Christian Jost, Bastian Knippschild, Bartosz Kostrzewa, Chuan Liu, Liuming Liu, Bernard Metsch, Marcus Petschlies, Carsten Urbach

摘要:

本文研究了Nf=2+1+1味格点量子色动力学中的Rho介子。计算是基于ETM合作产生的规范配置合奏与三个晶格间距值和π介子质量范围从230 MeV到500 MeV。应用Lüscher方法分别确定所有系综的相移曲线。假设Breit-Wigner形式,通过拟合这些相移曲线来确定Rho介子的质量和宽度。质量和宽度相结合,然后外推到手性限制,而晶格文物是无法检测到我们的统计不确定性。对于外推到物理点的ρ介子质量,我们发现与实验符合得很好。相应的衰变宽度与实验值相差约两个标准偏差。

英文摘要:

We present an investigation of the Rho-meson from Nf=2+1+1 flavour lattice QCD. The calculation is performed based on gauge configuration ensembles produced by the ETM collaboration with three lattice spacing values and pion masses ranging from 230 MeV to 500 MeV. Applying the Lüscher method phase shift curves are determined for all ensembles separately. Assuming a Breit-Wigner form, the Rho-meson mass and width are determined by a fit to these phase shift curves. Mass and width combined are then extrapolated to the chiral limit, while lattice artefacts are not detectable within our statistical uncertainties. For the Rho-meson mass extrapolated to the physical point we find good agreement with experiment. The corresponding decay width differs by about two standard deviations from the experimental value.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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