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arXiv 1902.04006hep-lathep-ph
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QCD中光和奇异夸克引起的弦破缺

String breaking by light and strange quarks in QCD

John Bulava, Ben Hörz, Francesco Knechtli, Vanessa Koch, Graham Moir, Colin Morningstar, Mike Peardon

摘要:

本文用具有$N_\mathrm{f}=2+1$动力学味的格格点量子色动力学方法计算了一个含有静态夸克反夸克对的系统的能谱。通过采用变分方法,包括类似于胶子弦和两个分离的静态介子系统的运营商的基础上,前三个能级确定的距离,它是积极有利的真空屏蔽静态源通过轻或奇怪的夸克对创建,使这两个屏蔽现象被观察到。分离依赖的能谱是可靠的参数化在这个饱和区域与一个简单的模型,可用作输入以上的阈值和重轻和重奇怪的耦合通道介子散射的夸克偶随后的调查。

英文摘要:

The energy spectrum of a system containing a static quark anti-quark pair is computed for a wide range of source separations using lattice QCD with $N_\mathrm{f}=2+1$ dynamical flavours. By employing a variational method with a basis including operators resembling both the gluon string and systems of two separated static mesons, the first three energy levels are determined up to and beyond the distance where it is energetically favourable for the vacuum to screen the static sources through light- or strange-quark pair creation, enabling both these screening phenomena to be observed. The separation dependence of the energy spectrum is reliably parameterised over this saturation region with a simple model which can be used as input for subsequent investigations of quarkonia above threshold and heavy-light and heavy-strange coupled-channel meson scattering.

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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