强子能谱中的阈值结构和强子分子态
Threshold Structures in Hadron Spectrum and Hadronic Molecules
董相坤1
作者信息
- 1. 中国科学院理论物理研究所,北京 100190
- 折叠
摘要
过去二十年来,实验中发现了许多奇特强子态或其候选者,其中大多数都位于一对强子的阈值附近.在本工作中,讨论了阈值附近不变质量分布的一般行为.确切地说,只有具有吸引相互作用的一对强子在阈值附近才会出现峰结构.本研究认为,在任何一对拥有吸引相互作用的重强子和反重强子的阈值附近,都应该在与之可以耦合的重夸克偶素-轻强子的不变质量分布中出现(近)阈结构.进一步,通过单玻色子交换模型计算了 一对重强子之间的领头阶常数相互作用并利用Bethe-Salpeter方程分析了可能形成的强子分子态.实验中观测到的强子分子态候选者与我们预测的能谱吻合得很好.
Abstract
Numerous candidates for exotic hadrons have been detected experimentally in the past two decades,pre-dominantly near the threshold of a pair of hadrons.This study aims to investigate the overall behavior of near-threshold line shapes in invariant mass distributions.It is noteworthy that the threshold cusp might manifest as a peak only in channels with attractive interaction.The assertion is made that there should be near-threshold structures for any heavy-quark and heavy-antiquark hadron pairs exhibiting attractive interaction at the threshold,as observed in the invariant mass distribution of heavy quarkonium and light hadrons that couple to the open-flavor hadron pair.Furthermore,we have conducted an analysis of potential hadronic molecules comprising pairs of heavy hadrons,util-izing the Bethe-Salpeter equation with constant interactions derived from the one-boson-exchange model.Observed candidates for these hadronic molecules are in good agreement with our predicted spectrum.
关键词
阈值结构/强子分子态/重-反重系统/重-重系统Key words
threshold structure/hadronic molecules/heavy-antiheavy systems/heavy-heavy systems引用本文复制引用
出版年
2024
NETL
NSTL
万方数据