Structure of charmed baryons studied by pionic decays
Structure of charmed baryons studied by pionic decays
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DOI：
10.1103/physrevd.95.014023
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发表时间：
2016-09
影响因子：
5
通讯作者：
H. Nagahiro;S. Yasui;A. Hosaka;M. Oka;H. Noumi
中科院分区：
文献类型：
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作者：
H. Nagahiro;S. Yasui;A. Hosaka;M. Oka;H. Noumi
我们研究了粲重子的衰变，目的是在夸克模型的基础上，通过关注重夸克对称性来系统地理解强子的内部结构。我们评估了已知激发态Λc*(2595)、Λc*(2625)、Λc*(2765)、Λc*(2880)和Λc*(2940)以及基态Σc（2455）和Σc*(2520)的单介子发射的衰减宽度。较好地解释了低激发态粲重子的衰变性质，并给出了对高激发态重子的几个重要预测。我们发现介子与轻夸克的轴矢量耦合是必要的，这是手性对称所期望的，可以再现衰变宽度，特别是低处Λc*重子的衰变宽度。我们强调了Γ（Σc*π）/Γ（Σcπ）的分支比对于研究高激发Λc*重子性质的重要性。
We investigate the decays of the charmed baryons aiming at the systematic understanding of hadron internal structures based on the quark model by paying attention to heavy quark symmetry. We evaluate the decay widths from the one-pion emission for the known excited states, Λc*(2595), Λc*(2625), Λc*(2765), Λc*(2880), and Λc*(2940), as well as for the ground states Σc(2455) and Σc*(2520). The decay properties of the lower excited charmed baryons are well explained, and several important predictions for higher excited baryons are given. We find that the axial-vector-type coupling of the pion to the light quarks is essential, which is expected from chiral symmetry, to reproduce the decay widths especially of the low-lying Λc* baryons. We emphasize the importance of the branching ratios of Γ(Σc*π)/Γ(Σcπ) for the study of the nature of higher excited Λc* baryons.