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arXiv 0804.0842hep-ph
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QCD求和规则中的σ介子

Sigma meson in QCD sum rules using a two quark current with derivatives

Su Houng Lee, Kenji Morita, Kazuaki Ohnishi

摘要:

本文利用带导数的双夸克内插场研究了QCD求和规则下的$σ$介子。在组分夸克模型中,$σ$介子由处于相对p波态的一个夸克和一个反夸克组成,因此预计与测量相对夸克波函数导数的内插场有更大的重叠。虽然没有导数的电流的求和规则给出了大约1 GeV的极质量,但具有导数电流的当前求和规则给出了大约550 MeV的质量和400 MeV的宽度,这可以用$σ$介子来识别。

英文摘要:

We study the $σ$ meson in QCD sum rules using a two quark interpolating field with derivatives. In the constituent quark model, the $σ$ meson is composed of a quark and an antiquark in the relative p-wave state and is thus expected to have a larger overlap with an interpolating field that measures the derivative of the relative quark wave-function. While the sum rule with a current without derivatives gives a pole mass of around 1 GeV, the present sum rule with a derivative current gives a mass of around 550 MeV and a width of 400 MeV, that could be identified with the $σ$ meson.

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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