We construct the spectral functions for light vector mesons at finite density and temperature in the presence of a novel mixing between parity partners, induced by baryon density via the Wess-Zumino-Witten action. As the main origin of in-medium broadening, a set of baryon resonances that strongly couple to the vector mesons and the modifications of kaons and antikaons due to the Kaplan-Nelson term are included. It is shown that the vector spectra, even with the broadening effects, exhibit sizable signatures of chiral symmetry restoration thanks to the chiral mixing depending on three-momenta carried by the vector mesons. Those spectral functions are used to calculate the integrated production rates of lepton pairs, and a proper binning in momenta and potential decrease in the vector-meson masses due to chiral symmetry restoration are discussed in quantifying the signatures.

中文翻译：

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冷致密物质中异常引起的手性混合

我们构建了光矢量介子在有限密度和温度下的光谱函数，在奇偶伙伴之间存在新的混合，由重子密度通过 Wess-Zumino-Witten 作用引起。作为介质中展宽的主要来源，包括了一组与矢量介子强耦合的重子共振，以及由于 Kaplan-Nelson 项而对 kaons 和 antikaons 的修改。结果表明，即使具有展宽效应，矢量光谱也表现出相当大的手性对称性恢复特征，这要归功于取决于矢量介子携带的三动量的手性混合。这些光谱函数用于计算轻子对的综合生产率，