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
影响因子:
5
通讯作者:
T. Yamazaki;M. Harada
中科院分区:
文献类型:
--
作者:
T. Yamazaki;M. Harada
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.