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arXiv 2609.20392hep-phhep-ex

非淬火耦合道框架中低位$\Omega_b(1P)$态的研究

Investigation of low-lying $Ω_b(1P)$ states in an unquenched coupled-channel framework

Zi-Le Zhang, Si-Qiang Luo, Shuai-Wei Wang, Qin Chang

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中文总结 AI 辅助

本研究通过耦合道方程分析非淬火效应对低位$\Omega_b(1P)$态的影响,发现$j_\ell=0$主导的$1/2^-$态因$S$波耦合$\Xi_b\bar{K}$道而质量下移,开启辐射与同位旋破缺衰变,为实验提供指导。

中文摘要 AI 辅助

在本工作中,我们利用耦合道方程研究了非淬火效应对低位$\Omega_b(1P)$态的影响。我们揭示了非淬火效应如何影响$\Omega_b(1P)$谱及其组分混合。数值结果表明,由$j_\ell=0$组态主导的$J^P=1/2^-$ $\Omega_b(1P)$态,因其与$\Xi_b\bar{K}$道的$S$波耦合而表现出显著的耦合道效应,其中$j_\ell$表示轻味自由度的总角动量。在这种情况下,该态的质量可能被移动至接近或低于$\Xi_b\bar{K}$阈值,使得辐射衰变和同位旋破缺衰变成为运动学上允许的衰变过程。本分析为低位$\Omega_b(1P)$谱提供了耦合道视角,并为未来激发底重子的实验研究提供了指导。

英文摘要

In this work, we study the unquenched effects on the low-lying $Ω_b(1P)$ states with a coupled-channel equations. We reveal how the unquenched effects affect the $Ω_b(1P)$ spectroscopy and component mixing. The numerical results indicate that the $J^P=1/2^-$ $Ω_b(1P)$ state dominated by the $j_\ell=0$ configuration exhibits significant coupled-channel effects due to its $S$-wave coupling to the $Ξ_b\bar{K}$ channel, where $j_\ell$ denotes the total angular momentum of the light flavor degrees-of-freedom. In this scenario, the mass of this state may be shifted close to or below the $Ξ_b\bar{K}$ threshold, making the radiative and isospin-breaking channels kinematically allowed decay processes. The present analysis provides a coupled-channel perspective on the low-lying $Ω_b(1P)$ spectrum and offers guidance for future experimental studies of excited bottom baryons.

发表机构

  • College of Physics and Electronic Engineering, Nanyang Normal University(南阳师范学院物理与电子工程学院)
  • School of Physical Science and Technology, Lanzhou University(兰州大学物理科学与技术学院)
  • Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Key Laboratory of Quantum Theory and Applications of MoE, Gansu Provincial Research Center for Basic Disciplines of Quantum Physics, Lanzhou University(兰州大学理论物理中心、甘肃省理论物理重点实验室、教育部量子理论与应用重点实验室、甘肃省量子物理基础学科研究中心)
  • MoE Frontiers Science Center for Rare Isotopes, Lanzhou University(兰州大学教育部稀有同位素前沿科学中心)
  • Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS(兰州大学与中国科学院近代物理研究所强子与CSR物理研究中心)
  • Institute of Particle and Nuclear Physics, Henan Normal University(河南师范大学粒子与核物理研究所)

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