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arXiv 0812.1460hep-phnucl-th
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FAIR的奇异与魅力

Strangeness and charm at FAIR

Laura Tolos, Daniel Cabrera, Daniel Gamermann, Tetsuro Mizutani, Raquel Molina, Eulogio Oset, Angels Ramos

摘要:

在FAIR/GSI的CBM实验所期望的密度和温度的实验条件下,我们在自洽耦合通道方法内研究了热密物质中奇异和粲介子的性质。在有限温度下的介质中的解决方案帐户泡利阻塞效应,平均场约束的所有重子参与,介子自能。在奇怪的部门,$\bar K$光谱函数在很宽的能量范围内传播,反映了熔化的$Λ(1405)$共振和贡献的$(Λ,Σ,Σ^*)N^{-1}$组件在有限的温度。在粲介子的情况下,动力学产生的$Λ_c(2593)$和$Σ_c(2880)$共振保持接近它们的自由空间位置,同时获得显著的宽度。结果,$D$介子谱密度在接近$D$介子自由空间质量的能量处显示出单个明显的峰值,该峰值随着物质密度的增加而变宽,特别是朝向较低能量具有延伸的尾部。我们还讨论了$D_{s0}(2317)$,$D_0(2400)$和预测的X(3700)共振在FAIR能量的影响。

英文摘要:

We study the properties of strange and charm mesons in hot and dense matter within a self-consistent coupled-channel approach for the experimental conditions of density and temperature expected for the CBM experiment at FAIR/GSI. The in-medium solution at finite temperature accounts for Pauli blocking effects, mean-field binding on all the baryons involved, and meson self-energies. In the strange sector, the $\bar K$ spectral function spreads over a wide range of energies, reflecting the melting of the $Λ(1405)$ resonance and the contribution of $(Λ,Σ,Σ^*)N^{-1}$ components at finite temperature. In the case of charm mesons, the dynamically-generated $Λ_c(2593)$ and $Σ_c(2880)$ resonances remain close to their free-space position while acquiring a remarkable width. As a result, the $D$ meson spectral density shows a single pronounced peak for energies close to the $D$ meson free-space mass that broadens with increasing matter density with an extended tail particularly towards lower energies. We also discuss the implications for the $D_{s0}(2317)$, $D_0(2400)$ and the predicted X(3700) resonances at FAIR energies.

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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