标题： 奇特重子的强衰变在重介子手征微扰理论中的研究：更新 显示英文标题

标题： Strong Decays of Charmed Baryons in Heavy Hadron Chiral Perturbation Theory: An Update

摘要： 我们首先简要概述了 charm 重子的谱学，并在夸克模型中讨论了它们可能的结构和自旋宇称赋值。 随着 Belle 对$\Sigma_c(2455)$和$\Sigma_c(2520)$宽度的新测量以及 CDF 对$\Lambda_c(2595)$和$\Lambda_c(2625)$强衰变的最近测量，我们在重介子手征微扰理论中给出了更新的耦合常数。 我们找到 $g_2=0.565^{+0.011}_{-0.024}$ 用于 $P$-波在 $s$-波和 $s$-波重子之间的跃迁，以及 $h_2$，其中一个耦合负责 $S$-波在 $s$-波和 $p$-波重子之间的跃迁，从 $\Lambda_c(2595)^+\to\Lambda_c^+\pi\pi$提取为 $0.63\pm0.07$。 与旧值0.437相比，它得到了显著增强。在夸克模型的帮助下，两个耦合常数$h_{10}$和$h_{11}$负责$D$波跃迁在$s$波和$p$波重子之间，是从$\Sigma_c(2880)$衰变中确定的。 对于耦合$h_2$存在一种矛盾，因为从$\Lambda_c(2595)^+\to \Lambda_c^+\pi\pi$提取的值将意味着$\Xi_c(2790)^0\to\Xi'_c\pi$和$\Xi_c(2815)^+\to\Xi_c^*\pi$率略高于当前限制。 可以设想 SU(3) 雷达对称性破缺可以帮助解释这一差异。 显示英文摘要

摘要： We first give a brief overview of the charmed baryon spectroscopy and discuss their possible structure and spin-parity assignments in the quark model. With the new Belle measurement of the widths of $\Sigma_c(2455)$ and $\Sigma_c(2520)$ and the recent CDF measurement of the strong decays of $\Lambda_c(2595)$ and $\Lambda_c(2625)$, we give updated coupling constants in heavy hadron chiral perturbation theory. We find $g_2=0.565^{+0.011}_{-0.024}$ for $P$-wave transitions between $s$-wave and $s$-wave baryons, and $h_2$, one of the couplings responsible for $S$-wave transitions between $s$-wave and $p$-wave baryons, is extracted from $\Lambda_c(2595)^+\to\Lambda_c^+\pi\pi$ to be $0.63\pm0.07$. It is substantially enhanced compared to the old value of order 0.437. With the help from the quark model, two of the couplings $h_{10}$ and $h_{11}$ responsible for $D$-wave transitions between $s$-wave and $p$-wave baryons are determined from $\Sigma_c(2880)$ decays. There is a tension for the coupling $h_2$ as its value extracted from $\Lambda_c(2595)^+\to \Lambda_c^+\pi\pi$ will imply $\Xi_c(2790)^0\to\Xi'_c\pi$ and $\Xi_c(2815)^+\to\Xi_c^*\pi$ rates slightly above the current limits. It is conceivable that SU(3) flavor symmetry breaking can help account for the discrepancy.