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arXiv 2312.08652hep-phnucl-th
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利用两味NJL模型研究热且手征不平衡介质中标量与赝标量介子的质量和谱函数

The mass and spectral function of scalar and pseudoscalar mesons in a hot and chirally imbalanced medium using the two-flavor NJL model

Snigdha Ghosh, Nilanjan Chaudhuri, Sourav Sarkar, Pradip Roy

AI总结:

该研究采用两味NJL模型和实时热场论,分析有限手征化学势下σ与π⁰介子的质量、谱函数及Landau割,揭示多重极点解和Mott温度降低等效应。

摘要:

我们在两味Nambu–Jona-Lasinio(NJL)模型框架下,研究手征不平衡介质中的中性介子性质。在有限手征化学势(CCP)下,组分夸克质量对温度的依赖关系展现出已被充分证实的现象:低温下的手征催化和高温下的反手征催化。我们采用热场论的实时形式,计算了标量(σ)和赝标量(π⁰)两个通道中的极化函数,并利用这些结果确定σ和π介子的质量及谱函数。通过详细研究σ和π介子极化函数虚部的解析结构,我们发现由于手征不平衡的存在,出现了非平凡的Landau割贡献。对于特定CCP取值下π介子质量的多重解,我们基于极点处的留数进行了分析。此外,我们观察到在有限CCP取值下,尤其是在较高温度时,标量和赝标量介子的质量均发生突变。随着CCP增大,Mott转变温度呈下降趋势。

英文摘要:

We explore the properties of neutral mesons within the context of a chirally imbalanced medium, employing the two-flavor Nambu--Jona-Lasinio model. The temperature dependence of the constituent quark mass at finite values of the chiral chemical potential (CCP) demonstrates the well-established phenomena of chiral catalysis at lower temperatures and inverse chiral catalysis at higher temperatures. The polarization functions in both the scalar ($σ$) and pseudo-scalar ($π^0$) channels have been evaluated using real time formalism of thermal field theory. These have been used to determine the masses and spectral functions of $ σ$ and $ π$ mesons. Detailed investigation of the analytic structure of the imaginary part of the polarization function for $σ$ and $π$ mesons results in the emergence of non-trivial Landau cut contributions due to the presence of chiral imbalance. The multiple solutions for the mass of the $π$ meson for specific values of CCP have been analysed on the basis of their residue at the pole. Furthermore, we have observed abrupt changes in the masses of both scalar and pseudo-scalar mesons at finite CCP values, particularly at higher temperatures. A decreasing trend in the Mott transition temperature is seen with the increase in CCP.

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