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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1006.3645nucl-thhep-phnucl-ex
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高密度和高温下奇异介子的产生

Strange meson production at high density and temperature

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

摘要:

本文用么正方法研究了稠密物质中奇异介子($K$、$\bar K$和$\bar K^*$)的介子-重子散射耦合通道的性质。K介子-核子相互作用包含了手征模型中的$s$ -和$p$ -波的贡献,而$\bar K^*$与核子的相互作用则是在局部隐规范形式的框架下得到的。散射振幅的介质内解考虑了泡利阻塞效应、重子平均场束缚和介子自能。我们得到了核介质中的$K$、$\bar K$和$\bar K^*$(离壳层)谱函数,并研究了它们在有限密度、温度和动量下的行为。我们还分析了能量加权求和规则的k介子传播模型计算的质量测试。最后,我们估计的透明度比的$γA \to K^+ K^{*-} A^\prime$反应,我们建议作为一个可行的方案,在目前的设施,以检测介质中修改的$\bar K^*$介子。

英文摘要:

The properties of strange mesons ($K$, $\bar K$ and $\bar K^*$) in dense matter are studied using a unitary approach in coupled channels for meson-baryon scattering. The kaon-nucleon interaction incorporates $s$- and $p$-wave contributions within a chiral model whereas the interaction of $\bar K^*$ with nucleons is obtained in the framework of the local hidden gauge formalism. The in-medium solution for the scattering amplitude accounts for Pauli blocking effects, mean-field binding on baryons, and meson self-energies. We obtain the $K$, $\bar K$ and $\bar K^*$ (off-shell) spectral functions in the nuclear medium and study their behaviour at finite density, temperature and momentum. We also analyze the energy weighted sum rules of the kaon propagator as a quality test of model calculations. We finally 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 in-medium modifications of the $\bar K^*$ 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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