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arXiv 1006.3454nucl-thhep-phnucl-ex
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稠密物质中的$\bar K^*$介子

$\bar K^*$ meson in dense matter

L. Tolos, R. Molina, E. Oset, A. Ramos

摘要:

本文在局域隐规范理论的框架下,结合物质中的$\bar K π$衰变通道,采用耦合通道的幺正方法研究了核物质中$\bar K^*$介子的性质.介质中的$\bar K^* N$相互作用解释了泡利阻塞效应,并以自洽的方式结合了$\bar K^*$自能。我们还得到了$\bar K^*$(离壳)谱函数,并分析了它在有限密度和动量下的行为。在正常的核物质密度下,$\bar K^*$介子感受到适度的吸引力,而$\bar K^*$宽度比自由空间大五倍。我们估计了$γA \to K^+ K^{* -} A^\prime$反应的透明度比,并提出了在现有的实验装置上,探测核介质中$\bar K^*$介子性质变化的可行方案。

英文摘要:

We study the properties of $\bar K^*$ mesons in nuclear matter using a unitary approach in coupled channels within the framework of the local hidden gauge formalism and incorporating the $\bar K π$ decay channel in matter. The in-medium $\bar K^* N$ interaction accounts for Pauli blocking effects and incorporates the $\bar K^*$ self-energy in a self-consistent manner. We also obtain the $\bar K^*$ (off-shell) spectral function and analyze its behaviour at finite density and momentum. At normal nuclear matter density, the $\bar K^*$ meson feels a moderately attractive potential while the $\bar K^*$ width becomes five times larger than in free space. We estimate the transparency ratio of the $γA \to K^+ K^{* -} A^\prime$ reaction, which we propose as a feasible scenario at present facilities to detect the changes of the properties of the $\bar K^*$ meson in the nuclear medium.

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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