A Study of Effects from a_(0)(980)Meson to Asymmetric Matter Based on a Parity Doublet Model  

基于手征双重模型研究a_(0)(980)介子对非对称物质的影响

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作  者:KONG Yukkei HARADA Masayasu 江育基;原田正康(名古屋大学物理系,日本名古屋464-8602;名古屋大学小林-益川基本粒子与宇宙起源研究所,日本名古屋464-8602;日本原子能研究开发机构先端基础研究中心,日本茨城319-1195)

机构地区:[1]Department of Physics,Nagoya University,Nagoya 464-8602,Japan [2]Kobayashi-Maskawa Institute for the Origin of Particles and the Universe,Nagoya University,Nagoya,464-8602,Japan [3]Advanced Science Research Center,Japan Atomic Energy Agency,Tokai 319-1195,Japan

出  处:《原子核物理评论》2024年第3期787-793,共7页Nuclear Physics Review

基  金:日本学术振兴会(JSPS)KAKENHI资助项目(20K03927)。

摘  要:In the present work,we study the effect of the isovector scalar meson a_(0)(980)(also calledδ)to the asymmetric matter properties by constructing a parity doublet model with including the a_(0)(980)meson based on the approximate chiral U(2)_(L)×U(2)_(R)symmetry.The effect of a_(0)(980)to the properties of symmetric matter such as symmetry energy S(n_(B)),symmetry incompressibility K_(sym),symmetry skewness Q_(sym)is investigated.We find that,a_(0)(980)meson has significant effect to these nuclear matter properties especially when the chiral invariant mass of nucleon m_(0)is small.We also study the effect of the a_(0)(980)meson to the neutron star(NS)properties and find that it increase the radius of NSs,especially those having intermediate mass.Finally,we further constrain the value of the chiral invariant mass of the nucleon to 640 MeV≲m_(0)≲860 MeV for L_(0)=57:7MeV by comparing with the recent accepted value of K_(sym)and neutron star(NS)observational data.在本工作中,通过基于近似U(2)_(L)×U(2)_(R)对称性构建包含a_(0)(980)介子的手征双重模型,研究了同位旋矢量标量介子a_(0)(980)(即δ)对不对称物质性质的影响,并研究了a_(0)(980)对对称物质性质的影响,如对称能S(nB)、对称能不可压缩系数K_(sym)、对称能偏斜系数Q_(sym)。发现a_(0)(980)介子对这些核物质性质有显著影响,特别是在核子手征不变质量m_(0)较小的情况下。还研究了a_(0)(980)介子对中子星(NS)性质的影响,发现它增加了NS的半径,特别是那些具有中等质量的中子星。最后,通过与最近约束的K_(sym)和NS观测数据比较,进一步将L=57.7 MeV时核子的手征不变质量值限制在640 MeV<m_(0)<860 MeV。

关 键 词:parity doublet model neutron star asymmetric matter isovector scalar meson a_(0)(980) 

分 类 号:O571.6[理学—粒子物理与原子核物理]

 

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