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arXiv 1008.2883nucl-thhep-ph
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热核物质中的$ρ$介子谱函数

$ρ$ - meson spectral function in hot nuclear matter

P. C. Raje Bhageerathi, Amruta Mishra

摘要:

在量子强子动力学(QHD)模型中,考虑了同位旋对称π介子和核子环,并利用有效手征SU(3)模型,研究了热核物质中$ρ$介子谱函数.本文在平均场近似(MFA)和相对论Hartree近似(RHA)下研究了$ρ$介子的谱函数。核子环的加入大大改变了$ρ$ -介子谱函数。由于$ ρ$介子在RHA中有较大的质量下降,谱函数向低不变质量区移动,而在MFA中谱函数则向高质量区轻微移动.此外,虽然在RHA中观察到的光谱函数与核子-反核子极化更尖锐,但在MFA中观察到的光谱函数更宽。

英文摘要:

We study the $ρ$-meson spectral function in hot nuclear matter by taking into account the isospin-symmetric pion and the nucleon loops within the quantum hadrodynamics (QHD) model as well as using an effective chiral SU(3) model. The spectral function of the $ρ$ meson is studied in the mean field approximation (MFA) as well as in the relativistic Hartree (RHA) approximation. The inclusion of the nucleon loop considerably changes the $ρ$-meson spectral function. Due to a larger mass drop of $ ρ$ meson in the RHA, it is seen that the spectral function shifts towards the low invariant mass region, whereas in the MFA the spectral function is seen to be slightly shifted towards the high mass region. Moreover, while the spectral function is observed to be sharper with the nucleon-antinucleon polarization in RHA, the spectral function is seen to be broader in the MFA.

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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