Chiral partner structure of light nucleons in an extended parity doublet model

Chiral partner structure of light nucleons in an extended parity doublet model
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DOI:
10.1103/physrevd.99.034012
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发表时间:
2018-09
期刊:
影响因子:
5
通讯作者:
T. Yamazaki;M. Harada
T. Yamazaki;M. Harada
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
T. Yamazaki;M. Harada

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我们使用基于宇称双峰结构的有效手性模型研究了四个轻核子 $N(939)$、$N(1440)$、$N(1535)$ 和 $N(1650)$ 的手性伙伴结构。在我们的模型中,我们在 $\mathrm{SU}(2{)}_{L}\ensuremath{\bigotimes}\mathrm{SU}(2{)}_{R}$ 对称性下引入了四种手性表示,(1,2)、(2,1)、(2,3) 和 (3,2)。我们通过晶格分析将模型参数拟合到 $N(939)$ 的质量、宽度和轴向电荷以及 $N(1535)$ 和 $N(1650)$ 的轴向电荷的可用实验值来确定模型参数。我们找到五组解: 在一组中,$N(939)$ 的手性伴侣是 $N(1440)$,具有小的手性不变质量。在另一组中,手性伴侣是具有大手性不变质量的$N(1535)$和$N(1650)$的混合物。使用这些解决方案,我们对与手性对称性恢复相关的轴向电荷和质量变化进行唯象预测。
We study chiral partner structure of four light nucleons, $N(939)$, $N(1440)$, $N(1535)$ and $N(1650)$, using an effective chiral model based on the parity doublet structure. In our model we introduce four chiral representations, (1,2), (2,1), (2,3) and (3,2), under $\mathrm{SU}(2{)}_{L}\ensuremath{\bigotimes}\mathrm{SU}(2{)}_{R}$ symmetry. We determine the model parameters by fitting them to available experimental values of masses, widths and the axial charge of $N(939)$ together with the axial charges of $N(1535)$ and $N(1650)$ by lattice analyses. We find five groups of solutions: In a group the chiral partner to $N(939)$ is $N(1440)$ having small chiral invariant mass. In another group, the chiral partner is a mixture of $N(1535)$ and $N(1650)$ having a large chiral invariant mass. Using the solutions, we give phenomenological predictions on the axial charges and changes of masses associated with chiral symmetry restoration.