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首页> 外文期刊>Physical review, C >Spectral functions for (D)over-bar and <(D-0(*) )over bar> mesons in nuclear matter with partial restoration of chiral symmetry
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Spectral functions for (D)over-bar and <(D-0(*) )over bar> mesons in nuclear matter with partial restoration of chiral symmetry

机译:(d)过律和<(d-0(*))的光谱函数,在核物质中的核心介子,部分恢复手性对称性

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摘要

We investigate the in-medium masses of a (D) over bar (0 ) meson and a <(D-0(*) )over bar> (0(vertical bar)) meson, and spectral functions for (D) over bar and <(D-0(*) )over bar> meson channels in nuclear matter. These mesons are introduced as chiral partners in the chiralsymmetry-broken vacuum, hence they are useful to explore the partial restoration of the broken chiral symmetry in nuclear matter. We consider the linear sigma model to describe the chiral symmetry breaking and to investigate a qualitative tendency of changes of (D) over bar mesons at low density. Our study shows that the loop corrections to (D) over bar and <(D-0(*) )over bar> meson masses provide a smaller mass splitting at finite density than that in vacuum, a result that indicates a tendency of the restoration of the chiral symmetry. We investigate also the spectral function for <(D-0(*) )over bar> meson channel, and find three peaks. The first peak, which corresponds to the resonance of the <(D-0(*) )over bar> meson, is broadened by collisions with nucleons in medium, and the peak position shifts to lower mass due to the partial restoration of chiral symmetry as the density increases. The second peak is identified as a threshold enhancement which shows a remarkable enhancement as the density increases. The third peak is Landau damping. The obtained properties of (D) over bar and <(D-0(*) )over bar> mesons in nuclear matter will provide useful information for experiments.
机译:我们研究了在杆>(0(垂直条))Meson上的杆(0)中的中式质量A(d)和杆(0)meson和<(d-0(*))和(d)的光谱功能<(d-0(*))在核物质中的酒吧>迈克斯频道。这些胶叶被引入手性伴侣的手性伴侣破碎的真空,因此它们可用于探索核物质中破碎的手性对称性的部分恢复。我们考虑线性Sigma模型来描述手性对称性突破,并在低密度下调查(d)的变化变化的定性趋势。我们的研究表明,通过杆> MESON质量在条形上校正(d)的杆和<(d-0(*))提供比真空的有限密度的较小质量分裂,结果表明还原的趋势手性对称。我们还研究了Bar> Meson通道的<(D-0(*))的光谱功能,并找到三个峰。对应于Bar> MESON的<(D-0(*))的共振的第一峰通过与培养基中的核聚体的碰撞而宽泛,并且由于手性对称的部分恢复,峰值位置转变为较低的质量随着密度增加。第二峰被识别为阈值增强,其显示随着密度增加而显着的增强。第三峰是Landau阻尼。在核物质中的酒吧>介子上方(d)的(d)上获得的(d)的性质将提供有用的实验信息。

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