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arXiv 1102.1786hep-phnucl-th
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手征孤子模型中具有二阶味对称破缺的重子十重态和反十重态的质量分裂

Mass splittings of the baryon decuplet and antidecuplet with the second-order flavor symmetry breakings within a chiral soliton model

Ghil-Seok Yang, Hyun-Chul Kim

摘要:

在手征孤子模型的框架下,考虑了同位旋和SU(3)味对称性破缺的二阶效应,我们重新讨论了SU(3)重子的质量分裂。与一阶修正相比,重子十重态的质量得到了改善。N^* 作为重子反十重态的一员,其质量为M_{n^*} =1687 MeV,与最近的实验数据一致。π-核子σ项变为π_{πN}=(50.5 \pm 5.4)MeV。

英文摘要:

We revisit the mass splittings of SU(3) baryons, taking into account the second-order effects of isospin and SU(3) flavor symmetry breakings within the framework of a chiral soliton model. The masses of the baryon decuplet turn out to be improved, compared to those with the first-order corrections. The mass of the N^* as a member of the baryon antidecuplet is obtained as M_{n^*}=1687 MeV, which is in agreement with the recent experimental data. The pion-nucleon sigma term becomes Σ_{πN}=(50.5\pm 5.4) MeV.

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