对3.9GeV附近0^(++)和2^(++)(类)粲偶素的理解  

Understanding the 0^(tt)and 2^(tt)charmonium(-like)states near 3.9 GeV

作　　者：纪腾 董相坤 Miguel Albaladejo 杜孟林 郭奉坤 Juan Nieves 邹冰松 Teng Ji;Xiang-Kun Dong;Miguel Albaladejo;Meng-Lin Du;Feng-Kun Guo;Juan Nieves;Bing-Song Zou(CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Instituto de Física Corpuscular(centro mixto CSIC-UV),Institutos de Investigación de Paterna,Valencia 46071,Spain;School of Physics,University of Electronic Science and Technology of China,Chengdu 611731,China;Peng Huanwu Collaborative Center for Research and Education,Beihang University,Beijing 100191,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Instituto de Física Corpuscular(centro mixto CSIC-UV),Institutos de Investigación de Paterna,Valencia 46071,Spain [4]School of Physics,University of Electronic Science and Technology of China,Chengdu 611731,China [5]Peng Huanwu Collaborative Center for Research and Education,Beihang University,Beijing 100191,China [6]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Science Bulletin》2023年第7期688-697,共10页科学通报（英文版）

基　　金：This work was supported by the Spanish Ministerio de Ciencia e Innovación(MICINN)and the European Regional Development Fund(ERDF)under Contract PID2020-112777 GB-I00;by the EU STRONG-2020 Project under the Program H2020-INFRAIA-2018–1 with Grant Agreement No.824093;by Generalitat Valenciana under Contract PROMETEO/2020/023;by the Chinese Academy of Sciences under Grant No.XDB34030000;by the National Natural Science Foundation of China(NSFC)under Grants No.12125507,No.11835015,No.12047503,and No.11961141012;by the NSFC and the Deutsche Forschungsgemeinschaft(DFG)through the funds provided to the Sino-German Collaborative Research Center TRR110“Symmetries and the Emergence of Structure in QCD”(NSFC Grant No.12070131001,DFG Project-ID 196253076);M.A.is supported by Generalitat Valenciana under Grant No.CIDEGENT/2020/002.

摘　　要：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.We propose that the X(3915)observed in the J/w channel is the same state as the Xe2(3930),and the X(3960),observed in the D,D,channel,is an S-wave D,D,hadronic molecule.In addition,the jpC=0^(++)component in the B^(+)→D^(+)D K^(+)assigned to the X(3915)in the current Review of Particle Physics has the same origin as the X(3960),which has a mass around 3.94 GeV.To check the proposal,the available data in the DD and D,D,channels from both B decays andγγfusion reaction are analyzed considering both the DD-D,D,-D'D'-D,D,coupled channels with o^(++)and a 2^(++)state introduced additionally.It is found that all the data in different processes can be simultaneously well reproduced,and the coupled-channel dynamics produce four hidden-charm scalar molecular states with masses around 3.73,3.94,3.99 and 4.23 Gev,respectively.The results may deepen our understanding of the spectrum of charmonia as well as of the interactions between charmed hadrons.

关 键 词：Charmonium(-like)states Hadronic molecules Heavy quark spin symmetry Exotic hadrons Hadron-hadron interactions 

分 类 号：O572[理学—粒子物理与原子核物理]