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Threshold Structures in Hadron Spectrum and Hadronic Molecules

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原子核物理评论 2024年第1期41卷 156-162页

作者： DONG Xiangkun CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China

Numerous candidates for exotic hadrons have been detected experimentally in the past two decades,predominantly near the threshold of a pair of *** study aims to investigate the overall behavior of nearthreshold line shapes in invariant mass *** is noteworthy that the threshold cusp might manifest as a peak only in channels with attractive *** 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 ***,we have conducted an analysis of potential hadronic molecules comprising pairs of heavy hadrons,utilizing the Bethe-Salpeter equation with constant interactions derived from the one-boson-exchange *** candidates for these hadronic molecules are in good agreement with our predicted spectrum.

关键词： threshold structure hadronic molecules heavy-antiheavy systems heavy-heavy systems

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强相互作用诺贝尔奖漫谈

物理 2022年第9期51卷 611-623页

作者：董相坤邹冰松中国科学院理论物理研究所北京100190 中国科学院大学物理科学学院北京100049 中国科学院近代物理研究所兰州730000

作为四大基本相互作用之一,强相互作用的研究可以追溯到19世纪末元素天然放射性的发现。在随后将近一个世纪里,经过众多科学家的不懈努力,强相互作用的面纱逐渐被揭开。文章将简要介绍与强相互作用相关的诺贝尔奖,并以此为载体梳理我们... 详细信息

作为四大基本相互作用之一,强相互作用的研究可以追溯到19世纪末元素天然放射性的发现。在随后将近一个世纪里,经过众多科学家的不懈努力,强相互作用的面纱逐渐被揭开。文章将简要介绍与强相互作用相关的诺贝尔奖,并以此为载体梳理我们在探索世界的进程中对强相互作用的认知过程。

关键词：强相互作用亚原子结构强子结构诺贝尔奖

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正反重强子对构成的强子分子态能谱

物理学进展 2021年第2期41卷 65-93页

作者：董相坤郭奉坤邹冰松中国科学院理论物理研究所中国科学院理论物理前沿重点实验室北京100190 中国科学院大学物理科学学院北京100049 中南大学物理学院长沙410083

近二十年来,世界上众多高能物理实验发现了大量超出传统夸克模型的共振结构。为了理解这些性质奇特的共振结构,科学家们提出了很多方法和模型。其中,因为实验上发现的这些奇特态大多处在一对强子阈值附近,强子分子态的观点得到了很多关... 详细信息

近二十年来,世界上众多高能物理实验发现了大量超出传统夸克模型的共振结构。为了理解这些性质奇特的共振结构,科学家们提出了很多方法和模型。其中,因为实验上发现的这些奇特态大多处在一对强子阈值附近,强子分子态的观点得到了很多关注。本文我们将以粲–反粲强子对为例来探究哪些系统可以形成分子态,进而给出粲–反粲强子分子态的能谱。我们考虑了所有由S波粲介子、粲重子以及窄的P波粲介子构成的粲–反粲强子对。我们假定它们之间的相互作用由介子交换主导,在最低阶近似下可简化为常数。通过求解常数相互作用的Bethe–Salpeter方程,我们可以找到振幅的极点进而确定该系统分子态的质量。最终我们发现,那些通过轻矢量介子交换在阈值附近产生吸引力的系统,会存在一个靠近阈值的极点。不同的系统,由于其相互作用强度不同,极点可能会处于能量复平面的第一黎曼面或者第二黎曼面,分别对应于束缚态或者虚态。我们总共发现了229个强子分子态。很多实验上发现的那些位于粲–反粲强子对阈值附近的共振结构可以很好地与我们的结果吻合。另外,我们需要强调所预言的一个ΛcˉΛc分子态,这个态可以很好地解释北京正负电子谱仪(BESIII)上测量的数据。

关键词：强子分子态奇特强子态隐粲系统极点

对3.9GeV附近0^(++)和2^(++)(类)粲偶素的理解

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Science Bulletin 2023年第7期68卷 688-697页

作者：纪腾董相坤 Miguel Albaladejo 杜孟林郭奉坤 Juan Nieves 邹冰松 CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Instituto de Física Corpuscular(centro mixto CSIC-UV) Institutos de Investigación de PaternaValencia 46071Spain School of Physics University of Electronic Science and Technology of ChinaChengdu 611731China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

在过去的20年里,各个实验组在粲偶素能量区间(约3.1~4.5 GeV)观测到了大量的(类)粲偶素,这些粲偶素的发现不仅极大地丰富了强子谱,也将传统的cc介子拓展到了奇特强子态领域.在3.9 GeV能量附近有许多(类)粲偶素的实验候选者,如:X(3915),Z... 详细信息

在过去的20年里,各个实验组在粲偶素能量区间(约3.1~4.5 GeV)观测到了大量的(类)粲偶素,这些粲偶素的发现不仅极大地丰富了强子谱,也将传统的cc介子拓展到了奇特强子态领域.在3.9 GeV能量附近有许多(类)粲偶素的实验候选者,如:X(3915),Z(3930),χc0(3930),χc2(3930)以及X(3960)等,然而它们的本质是什么依然存在争议.本文提出以下猜想:(1)J/φω中观测到的X(3915)与χc2(3930)是同一个态;(2) Ds+Ds-道中观测到的X(3960)是Ds+Ds-体系的S波强子分子态;(3)B+→D+D-K+过程里的JPC=0++组分与X(3960)具有相同来源,质量大约为3.94GeV,并非如《粒子物理综述》中所列来源于X(3915).通过对LHCb实验组在B+→D((s))+D((s))-K+过程以及Belle和BaBar实验组在双光子对撞过程给出的实验数据进行联合拟合,作者发现上述猜想与当前的实验结果都是一致的.本工作不仅对(类)粲偶素能谱提供了新的探索思路,也加深了研究人员对含粲强子之间的相互作用的理解.

关键词： Charmonium(-like)states Hadronic molecules Heavy quark spin symmetry Exotic hadrons Hadron-hadron interactions

Is the existence of a J/ψJ/ψbound state plausible?

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Science Bulletin 2021年第24期66卷 2462-2470,M0003页

作者： Xiang-Kun Dong Vadim Baru Feng-Kun Guo Christoph Hanhart Alexey Nefediev Bing-Song Zou CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Institut für Theoretische Physik Ⅱ Ruhr-Universität BochumBochum D-44780Germany Institute for Theoretical and Experimental Physics NRC“Kurchatov Institute” Moscow 117218Russia Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron PhysicsForschungszentrum JülichJülich D-52425Germany P.N.Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991Russia Moscow Institute of Physics and Technology Moscow 141700Russia School of Physics Central South UniversityChangsha 410083China

In a recent measurement LHCb reported pronounced structures in the J/ψJ/ψ*** of the various possible explanations of those is that they emerge from non-perturbative interactions of vector *** is thus important to understand whether it is possible to form a bound state of two charmonia interacting through the exchange of gluons,which hadronise into two pions at the longest *** this paper,we demonstrate that,given our current understanding of hadron-hadron interactions,the exchange of correlated light mesons(pions and kaons)is able to provide sizeable attraction to the di-J/ψsystem,and it is possible for two J/ψmesons to form a bound *** a side result we find from an analysis of the data for theψ/(2 S)J/ψππtransition including bothππand KK final state interactions an improved value for theψ(2 S)→J/ψtransition chromo-electric polarisability:|αψ(2 S)J/ψ|=(1.8±0.1)GeV-3,where the uncertainty also includes the one induced by the final state interactions.

关键词： Fully-charm tetraquark Hadronic molecule Exotic hadron Dispersion relation

Molecular states in D_(s)^(*)+=^_(c)^(′,*)systems^(*)

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Chinese Physics C 2023年第12期47卷 16-30页

作者：尼加提·亚力坤董相坤邹冰松 School of Physics Science and Technology Xinjiang UniversityUrumqi 830046China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

The possible hadronic molecules in D_(S)^(∗)+Ξ_(c)(′,∗)systems with J^(P)=1/2−,3/2−,and 5/2−are investigated with interactions described by light meson *** varying the cutoff in a phenomenologically reasonable range of 1−2.5 GeV,we find ten near-threshold(bound or virtual)states in the single-channel *** introducing the coupled-channel dynamics of D_(+)^(s)Ξ_(c)-D_(s)^(+)Ξ′c-D_(s)^(∗+)Ξ_(c-)D_(s)^(+)Ξ_(c)^(*)-D_(s)^(∗)+sΞ′_(c)-D_(s)^(∗)Ξ_(c)^(∗)systems,these states,except those below the lowest channels in each JP sector,move into the complex energy plane and become resonances in the mass range 4.43−4.76 *** spin-parities and nearby thresholds are 1/2−(D_(s)^(+)Ξ′_(c)),1/2^(−)(D_(s)^(++)Ξ_(c)^(*)),1/2−(D_(s)^(∗+)Ξ_(c)),1/2−(D_(s)^(∗+)Ξ_(c)^(′)),1/2−(D_(s)^(∗+)Ξ_(c)^(∗)),3/2−(D_(s)^(∗+)(Ξc),3/2−(D_(s)^(+)Ξ_(c)),3/2−(D_(s)^(∗+)Ξ′c),3/2−(D_(+s)^(∗)Ξ_(c)^(∗)),and 5/2−(D_(s)^(∗+)Ξ_(c)^(∗)).The impact of theδ(r)-term in the one-boson-exchange model on these states is ***Λ=1.5 GeV as an illustrative value,it is found that 1/2−(D_(s)^(*+)Ξ_(c))is a stable bound state(becoming unstable if the coupling to lower channels is turned on),1/2−(D∗+sΞc)and 3/2−(D_(s)^(∗+)Ξ_(c))are physical resonances in cases where theδ(r)-term is included or excluded,and the other seven states are physical resonances or"virtual-state-like"poles near thresholds,depending on whether theδ(r)-term is *** addition,the partial decay widths of the physical resonances are *** double-charm hidden-strangeness pentaquark states,as the partners of the experimentally observed Pc and Pcs states,can be searched for in the D(∗)Λ_(c)final states in the future.

关键词： pentaquarks chiral perturbation theory resonance

Derived Born cross sections of e^+e^-annihilation into open charm mesons from CLEO-c measurements

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Chinese Physics C 2018年第4期42卷 69-75页

作者： Xiang-Kun Dong Liang-Liang Wang Chang-Zheng Yuan University of Chinese Academy of Sciences Beijing 100049 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

The exclusive Born cross sections of the production of D0, D＋ and Ds＋ mesons in e＋e- annihilation at 13 energy points between 3.970 and 4.260 GeV are obtained by applying corrections for initial state radiation and vacuum polarization to the observed cross sections measured by the CLEO-c experiment. Both the statistical and the systematic uncertainties for the obtained Born cross sections are estimated.

关键词： electron-positron annihilation charm production Born cross section radiative correction

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论职业学校英语教师课堂角色的转换

职业技术 2009年第6期 65-65页

作者：董相坤哈尔滨技师学院

美国语言学家Rivers曾经说过：“对于学生和老师来讲,语言学习和教学应该是一天中令人兴奋,精神愉快的一人段时光,职业学校的英语课堂教学就更应该如此。”

关键词：职业学校课堂角色英语教师英语课堂教学语言学家语言学习老师学生

Hadronic cross section of e^+e^- annihilation at bottomonium energy region

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Chinese Physics C 2020年第8期44卷 1-15页

作者： Xiang-Kun Dong Xiao-Hu Mo Ping Wang Chang-Zheng Yuan Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The Born cross section and dressed cross section of e+e−→bb¯and the total hadronic cross section in e+e−annihilation in the bottomonium energy region are calculated based on the Rb values measured by the BaBar and Belle *** data are used to calculate the vacuum polarization factors in the bottomonium energy region,and to determine the resonant parameters of the vector bottomonium(-like)states Y(10750),Υ(5S),andΥ(6S).

关键词： e^+e^-annihilation bottmonium spectroscopy vacuum polarization