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^(+)...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.展开更多
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^(+)...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.展开更多
The low-energy J/ψscattering is important for various reasons:it is related to the hidden-charm P_(c)pentaquark states,provides insights into the role of gluons in nucleon structures,and is relevant to the properties...The low-energy J/ψscattering is important for various reasons:it is related to the hidden-charm P_(c)pentaquark states,provides insights into the role of gluons in nucleon structures,and is relevant to the properties in nuclear medium.The scattering can happen through two distinct mechanisms:the coupled-channel mechanism via open-charm meson-baryon intermediate states,and the soft-gluon exchange mechanism.We investigate the J/ψ-wave scattering length through both mechanisms,and find that the soft-gluon exchange mechanism leads to a scattering length at least one order of magnitude larger than that from the coupled-channel mechanism and thus is the predominant one.The findings can be verified by lattice calculations and will enhance our understanding of the scattering processes breaking the Okubo-Zweig-Iizuka rule.展开更多
基金supported by the Spanish Ministerio de Ciencia e Innovación(MICINN)and the European Regional Development Fund(ERDF)under Contract PID2020-112777 GB-I00by the EU STRONG-2020 Project under the Program H2020-INFRAIA-2018–1 with Grant Agreement No.824093+4 种基金by Generalitat Valenciana under Contract PROMETEO/2020/023by the Chinese Academy of Sciences under Grant No.XDB34030000by the National Natural Science Foundation of China(NSFC)under Grants No.12125507,No.11835015,No.12047503,and No.11961141012by 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.
文摘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.
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)。
文摘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.
基金supported in part by the National Natural Science Foundation of China(12125507,12361141819 and 12447101)by the Chinese Academy of Sciences(YSBR-101).
文摘The low-energy J/ψscattering is important for various reasons:it is related to the hidden-charm P_(c)pentaquark states,provides insights into the role of gluons in nucleon structures,and is relevant to the properties in nuclear medium.The scattering can happen through two distinct mechanisms:the coupled-channel mechanism via open-charm meson-baryon intermediate states,and the soft-gluon exchange mechanism.We investigate the J/ψ-wave scattering length through both mechanisms,and find that the soft-gluon exchange mechanism leads to a scattering length at least one order of magnitude larger than that from the coupled-channel mechanism and thus is the predominant one.The findings can be verified by lattice calculations and will enhance our understanding of the scattering processes breaking the Okubo-Zweig-Iizuka rule.
