Analysis of Lambda(c)(2595), Lambda(c)(2625), Lambda(b)(5912), Lambda(b)(5920) based on a chiral partner structure

作者：Kawakami Yohei^*; Harada Masayasu^*

来源：PHYSICAL REVIEW D, 2018, 97(11): 114024.

DOI：10.1103/PhysRevD.97.114024

We construct an effective hadronic model including Lambda(c)(2595), Lambda(c)(2625), Lambda(b)(5912), and Lambda(b)(5920), regarding them as chiral partners to Sigma(c)(2455), Sigma(c)(2520),Sigma(b) and Sigma(b)*, and respectively, with respecting the chiral symmetry and heavy-quark spin-flavor symmetry. We determine the model parameters from the experimental data for relevant masses and decay widths of Sigma(()(c)*()) and Lambda(c)(2595). Then, we study the decay widths of Lambda(c)(2625), Lambda(b)(5912), and Lambda(b)(5920). We find that, although the decay of Lambda(c)(2595) is dominated by the resonant contribution through Sigma(c)(2455), nonresonant contributions are important for Lambda(c)(2625), Lambda(b)(5912), and Lambda(b)(5920), which reflects the chiral partner structure. We also study the radiative decays of the baryons, and show that each of their widths is determined from the radiative decay width of their chiral partners.

• 出版日期2018-6-22