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arXiv 0911.2600hep-phnucl-exnucl-th
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从SIS到FAIR的奇异介子

Strange mesons from SIS to FAIR

L. Tolos, D. Cabrera, A. Polls, A. Ramos

摘要:

本文采用手征么正方法,结合K介子-核子相互作用的$s$波和p波,计算了有限温度下核物质中$K$和$\bar K$介子的性质.介质内解考虑了泡利阻塞效应、平均场对所有重子的束缚以及$π$和K介子的自能。$\bar K$谱函数在很宽的能量范围内传播,反映了$Λ(1405)$共振的熔化和超子空穴成分在有限温度下的贡献。在$KN$扇区中,准粒子峰随着密度和温度的增加而显著加宽。我们还研究了K介子传播子的能量加权求和规则,通过匹配传播子的Dyson形式和它的谱Lehmann表示,在低能量和高能量。较低能量权重的求和规则得到满意的满足,并反映了谱函数的不同准粒子和集体模式的贡献。我们分析的灵敏度的总和规则的谱强度的分布和它们的有用性作为模型计算的质量测试。

英文摘要:

The properties of $K$ and $\bar K$ mesons in nuclear matter at finite temperature are obtained from a chiral unitary approach in coupled channels which incorporates the $s$- and p-waves of the kaon-nucleon interaction. The in-medium solution accounts for Pauli blocking effects, mean-field binding on all the baryons involved, and $π$ and kaon self-energies. The $\bar K$ spectral function spreads over a wide range of energies, reflecting the melting of the $Λ(1405)$ resonance and the contribution of hyperon-hole components at finite temperature. In the $KN$ sector, the quasi-particle peak is considerably broadened with increasing density and temperature. We also study the energy weighted sum rules of the kaon propagator by matching the Dyson form of the propagator with its spectral Lehmann representation at low and high energies. The sum rules for the lower energy weights are fulfilled satisfactorily and reflect the contributions from the different quasi-particle and collective modes of the spectral function. We analyze the sensitivity of the sum rules to the distribution of spectral strength and their usefulness as quality tests of model calculations.

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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