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.
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)
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.
