Precise determination of the pole position of the exotic Z_(c)(3900)  

作　　者：Yun-Hua Chen Meng-Lin Du Feng-Kun Guo 

机构地区：[1]School of Mathematics and Physics,University of Science and Technology Beijing,Beijing 100083,China [2]School of Physics,University of Electronic Science and Technology of China,Chengdu 611731,China [3]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [4]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [5]Peng Huanwu Collaborative Center for Research and Education,Beihang University,Beijing 100191,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第9期84-90,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11975028,11974043,12361141819,12125507,11835015,12047503,and 12070131001);the Chinese Academy of Sciences(Grant Nos.XDB34030000,and YSBR-101);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”(Grant No.DFG Project-ID 196253076)。

摘　　要：We perform a unified description of the experimental data of the π^(+)π^(-)and J/ψπ^(±)invariant mass spectra for e^(+)e^(-)→J/ψπ^(+)π^(-)and the D^(0)D^(*-)mass spectrum for e^(+)e^(-)→D^(0)D^(*-)π^(+)at e^(+)e^(-)center-of-mass energies 4.23 and 4.26 GeV.The analysis takes into account open-charm meson loops that contain triangle singularities,the J/ψπ-DD^(*)coupled-channel interaction respecting unitarity,and the strong ππ-KK final state interaction using dispersion relations.The analysis leads to a precise determination of the Z_(c)(3900)pole with the pole mass and width(3880.7±1.7_(stat)±22.4_(syst))MeV and(35.9±1.4_(stat)±15.3_(syst))MeV,respectively,and hints at that the DD^(*)molecular and non-molecular components are of similar importance in the Z_(c)(3900)formation.

关 键 词：exotic hadrons dispersion relations final state interaction triangle singularity 

分 类 号：O572.2[理学—粒子物理与原子核物理]