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Semi-inclusive lepto-production of hidden-charm exotic hadrons

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Chinese Physics C 2021年第12期45卷 1-7页

作者：杨智郭奉坤 School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China CAS Key Laboratory of Theoretical PhysicsInstitute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

We investigate the semi-inclusive production of hidden-charm exotic states,including the X(3872),Z_(c),Zcs and pentaquark P_(c) states,in lepton-proton scattering processes.These hadrons are close to the thresholds of a pair of charm and anticharm hadrons and are assumed to possess a hadronic molecular structure as their main feature.To provide order-of-magnitude estimates of the cross sections,we use Pythia to simulate the short-distance productions of the constituent hadrons,which then rescatter to form exotic hadrons.The estimates for the X(3872)and Z_(c)(3900)^(±)states are not in conflict with the upper limits measured in the COMPASS experiment for the exclusive photoproduction process.The results indicate that the considered hidden-charm states can be copiously produced at the proposed electron-ion colliders EicC and US-EIC.

关键词： hidden-charm exotic hadrons lepto-production

Interpretation of theη_(1)(1855)as a KK_(1)(1400)+c.c.molecule

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Science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 60-66页

作者： Xiang-Kun Dong Yong-Hui Lin 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 Helmholtz-Institut fur Strahlen-und Kernphysik and Bethe Center for Theoretical Physics Universitat BonnBonn D-53115Germany School of Physics Central South UniversityChangsha 410083China

An exotic state with J^(PC)=1^(−+),denoted byη1(1855),was observed by BESIII Collaboration recently in J/ψ→γηη′.The fact that its mass is just below the threshold of KK_(1)(1400)stimulates us to investigate whether this exotic state can be interpreted as a KK_(1)(1400)+c.***.molecule or not.Using the one boson exchange model,we show that it is possible for KK_(1)(1400)with J^(PC)=1^(−+)to bind together by taking the momentum cutoffΛ&2 GeV and yield the same binding energy as the experimental value whenΛ≈2.5 GeV.In this molecular picture,the predicted branch ratio Br(η1(1855)→ηη′)≈15%is consistent with the experimental results,which again supports the molecular explanation ofη1(1855).Relevant systems,namely KK_(1)(1400)with JPC=1−−and KK_(1)(1270)with J^(PC)=1^(−±),are also investigated,some of which can be searched for in the future experiments.

关键词： hadronic molecule exotic hadrons one boson exchange

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利用机器学习研究隐粲五夸克态的性质

Science Bulletin 2023年第10期68卷 981-989,M0003页

作者：张振宇刘家豪胡继峰王倩 Ulf-G.Meißner Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing CenterSouth China Normal UniversityGuangzhou 510006China Helmholtz-Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics Universität BonnBonn D-53115Germany Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron PhysicsForschungszentrum JülichJïlich D-52425Germany Tbilisi State University Tbilisi 0186Georgia

机器学习已经在生物、医学、生产等多个领域广泛应用并展现了其优势.最近,机器学习在物理领域也开始逐渐兴起并展现出其独特的优点.该文旨在探索机器学习在强子物理中的应用潜力.作者以隐粲五夸克态Pc(4312)、Pc(4440)和Pc(4457)为例,... 详细信息

机器学习已经在生物、医学、生产等多个领域广泛应用并展现了其优势.最近,机器学习在物理领域也开始逐渐兴起并展现出其独特的优点.该文旨在探索机器学习在强子物理中的应用潜力.作者以隐粲五夸克态Pc(4312)、Pc(4440)和Pc(4457)为例,在强子分子态图像下研究它们的性质.研究表明,神经网络方法和基于χ2的拟合方法都能够阐明基于领头阶接触势的基本物理性质.然而,χ2拟合方法无法区分Pc(4440)和Pc(4457)的量子数,神经网络方法则可以.由此,作者进一步分析了每个实验数据点对于神经网络预测的影响,以及在拟合方法中每个数据点对于关键物理参数的重要性.通过对比研究,作者发现神经网络方法可以多维度地利用实验数据信息,在强子物理中具有巨大的应用前景.

关键词： exotic hadrons Machine learning QCD mass spectrum Hidden charm pentaquarks

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

Note on X(3872) production at hadron colliders and its molecular structure

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Chinese Physics C 2017年第12期41卷 1-3页

作者： Miguel Albaladejo 郭奉坤 Christoph Hanhart Ulf-G.Mei?ner Juan Nieves Andreas Nogga 杨智 Departamento de Física Universidad de Murcia CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron Physics Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universitt Bonn Instituto de Física Corpuscular (IFIC) Centro Mixto CSIC-Universidad de ValenciaInstitutos de Investigación de Paterna Institute of Modern Physics Chinese Academy of Sciences

The production of the X（3872） as a hadronic molecule in hadron colliders is clarified. We show that the conclusion of Bignamini et al., Phys. Rev. Lett. 103（2009） 162001, that the production of the X（3872） at high pT implies a non-molecular structure, does not hold. In particular, using the well understood properties of the deuteron wave function as an example, we identify the relevant scales in the production process.

关键词： X（3872） hadronic molecules exotic hadrons

Towards the establishment of the light J^(P(C))=1^(-(+))hybrid nonet

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Chinese Physics C 2022年第5期46卷 1-10页

作者：邱林赵强 Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China China Center of Advanced Science and Technology Chinese Academy of SciencesBeijing 100080China

The observation of the light hybrid candidateη_(1)(1855)by the BESⅢ Collaboration offers great opportunities for advancing our knowledge on exotic hadrons in terms of flavor sector.We demonstrate that this observation provides a crucial clue for establishing the J^(P(C))=1^(−(+))hybrid nonet.Based on the flux tube model picture,the production and decay mechanisms for the J^(P(C))=1^(−(+))hybrid nonet in the J/ψradiative decays into two pseudoscalar mesons are investigated.In the I=0 sector,we deduce that the SU(3)flavor octet and singlet mixing is non-negligible and apparently deviates from the flavor ideal mixing.Because only signals for one isoscalarη_(1)(1855)are observed in theηη′channel,we investigate two schemes of the nonet structure in whichη_(1)(1855)can either be the higher or lower mass state that strongly couples toηη′.Possible channels for detecting the multiplets are suggested.In particular,a combined analysis of the hybrid production in J/ψ→VH,where V and H denote the light vector mesons and 1^(−(+))hybrid states,respectively,may provide further evidence for this nonet structure and ultimately establish these mysterious exotic species in the experiment.

关键词： exotic hadrons hybrid quark model

Quantum numbers of the pentaquark states Pc+ via symmetry analysis

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Communications in Theoretical Physics 2020年第12期72卷 145-151页

作者： Chong-yao Chen Muyang Chen Yu-Xin Liu Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Center for High Energy Physics Peking UniversityBeijing 100871China Department of Physics Hunan Normal UniversityChangsha 410081China

We investigate the quantum numbers of the pentaquark states Pc+,which are composed of 4(three flavors)quarks and an antiquark,by analyzing their inherent nodal structure in this paper.Assuming that the four quarks form a tetrahedron or a square,and the antiquark is at the ground state,we determine the nodeless structure of the states with orbital angular moment L≤3,and in turn,the accessible low-lying states.Since the inherent nodal structure depends only on the inherent geometric symmetry,we propose the quantum numbers JPof the low-lying pentaquark states P_c^+may be■,■,■and■,independent of dynamical models.

关键词： pentaquark states exotic hadrons color confinement symmetry analysis

Heavy quark spin symmetry and heavy flavor hadronic molecules

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Chinese Physics C 2010年第9期34卷 1294-1297页

作者：郭奉坤 Institut für Kernphysik and Jülich Center for Hadron Physics

We argue that the heavy quark spin symmetry can lead to important consequences for heavy flavor hadronic molecules.It can be used to predict new heavy flavor hadronic molecules and hence provides a method to identify the nature of some newly observed exotic hadrons.For example,if the Y（4660） were an S-wave ψ f 0 （980） shallow bound state,then the mass,width and line shape of its spin partner are predicted.

关键词： heavy quark spin symmetry hadronic molecules exotic hadrons

Comment on ‘Note on X(3872) production at hadron colliders and its molecular structure’

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Chinese Physics C 2018年第11期42卷 105-106页

作者： A. Esposito B. Grinstein L. Maiani F. Piccinini A. Pilloni A.D. Polosa V. Riquer Center for Theoretical Physics and Dept. of Physics Columbia University New York NY 10027 USA Department of Physics University of California San Diego La Jolla California 92093-0315 USA CERN Theory Department Geneva 1211 Switzerland INFN Sezione di Pavia Via A. Bassi 6 27100 Pavia Italy Theory Center Thomas Jefferson National Accelerator Facility Newport News VA 23606 USA Dipartimento di Fisica and INFN Sapienza Universita di Roma P.le Aldo Moro 2 1-00185 Roma Italy

We briefly comment on the paper by Albaladejo et al., Chinese Phys. C 41 121001, rejecting its conclusions.

关键词： X（3872） hadronic molecules exotic hadrons