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arXiv 0909.3255hep-lathep-exhep-ph
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最大扭曲质量格点量子色动力学的π + π +散射长度

The pi+ pi+ scattering length from maximally twisted mass lattice QCD

Xu Feng, Karl Jansen, Dru B. Renner

摘要:

在格点量子色动力学中,用两种最大扭曲质量费米子,在0.086 fm的格点间距下,计算了π介子质量从270 Mev到485 Mev的π介子在同位旋I=2通道中的s波散射长度.此外,我们在0.067 fm的更精细的晶格间距处使用一次计算来检查晶格伪影。我们使用的手征微扰理论在次领先阶外推我们的结果。在物理π质量下,我们发现散射长度的m_pi a_pipi(I=2)=-0.04385(28)(38),其中第一个误差是统计误差,第二个误差是我们对几个系统效应的估计。

英文摘要:

We calculate the s-wave pion-pion scattering length in the isospin I=2 channel in lattice QCD for pion masses ranging from 270 Mev to 485 Mev using two flavors of maximally twisted mass fermions at a lattice spacing of 0.086 fm. Additionally, we check for lattice artifacts with one calculation at a finer lattice spacing of 0.067 fm. We use chiral perturbation theory at next-to-leading order to extrapolate our results. At the physical pion mass, we find m_pi a_pipi(I=2)=-0.04385(28)(38) for the scattering length, where the first error is statistical and the second is our estimate of several systematic effects.

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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