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Prediction of possible exotic states in the η■K~* system

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Chinese Physics C 2020年第5期44卷 74-80页

作者：张旭谢聚军 Institute of Modern Physics Chinese Academy of Sciences School of Nuclear Sciences and Technology University of Chinese Academy of Sciences School of Physics and Microelectronics Zhengzhou University Zhengzhou

We investigate the ηKK~*three-body system in order to look for possible IG(JPC)=0~+(1-+) exotic states in the framework of the fixed-center approximation of the Faddeev equation.We assume the scattering of η on a clusterized system KK~*,which is known to generate f1(1285),or a K in a clusterized system ηK~*,which is shown to generate K1(1270).In the case of η-(KK~*)f1(1285) scattering,we find evidence of a bound state IG(JPC)=0~+(1-+) below theηf1(1285) threshold with a mass of around 1700 MeV and a width of about 180 MeV.Considering K-(η/K~*)K1(1270)scattering,we obtain a bound state I(J~P)=0(1~-) just below the KK1(1270) threshold with a mass of around 1680 MeV and a width of about 160 MeV.

关键词： exotic states fixed-center approximation chiral unitary approach

D-wave excited cscs tetraquark states with J^(PC)=1^(++)and 1^(+-)

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Chinese Physics C 2023年第5期47卷 82-111页

作者：杨梓衍陈伟 School of Physics Sun Yat-Sen UniversityGuangzhou 510275China

We study the mass spectra of D-wave excited cscs tetraquark states with J^(PC)=1^(++)and 1^(+-)in both symmetric 6cs@6cs and antisymmetric 3cs@3cs color configurations using the QCD sum rule method.We construct the D-wave diquark-antidiquark type of cscs tetraquark interpolating currents in various excitation structures with(L_(λ),Lp{p_(1),p_(2)})=(2,0(0,0),(1,1(1,0),(1,1(0,1),(0,2(1,1),(0,2(2,0),(0,2(0,2).Our results support the interpretation of the recently observed X(4685)resonance as a D-wave cscs tetraquark state with JPC-1++in the(2,O(0,O))or(0,2(2,O))excitation mode,although some other possible excitation structures cannot be excluded exhaustively within theoretical errors.Moreover,our results provide the mass relations 6_(ρρ)<3_(λλ)<3_(λρ)<3_(ρρ)and 6pp<3au<6aa<3pp for the positive and negative C-parity D-wave cscs tetraquarks,respectively.We suggest searching for these possible D-wave cscs tetraquarks in both the hidden-charm channels J/o and nc,as well as open-cham channes such as D_(s)D_(x)nd D_(s)D_(s1).

关键词： tetraquark states exotic states QCD sum rules

Study of the XYZ states at the BESIII

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Frontiers of physics 2015年第6期10卷 59-69页

作者： Chang-Zheng Yuan Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

With its unique data samples at energies of 3.8-4.6 GeV, the BESIII experiment made a significant contribution to the study of charmonium and charinonium-like states, i.e., the XYZ states. We review the results for observations of the Zc（3900） and Zc（4020） states, the X（3872） in e^＋e^- annihilation, and charmonium ψ（13D2） state, as well as measurements of the cross-sections of ωχcJ and ηJ/ψ, and the search for e^＋e^-→γχcJ and γY（4140）. We also present data from BESIII that may further strengthen the study of the XYZ and conventional charmonium states, and discuss perspectives on future experiments.

关键词： charmonium exotic states e^＋e^- annihilation hadronic transitions radiative transtitions

Study of the structures of four-quark states in terms of the Born-Oppenheimer approximation

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Chinese Physics C 2015年第8期39卷 22-31页

作者：刘学文柯红卫丁亦兵李学潜 School of Physics Nankai University School of Science Tianjin University School of Physics University of Chinese Academy of Sciences

In this work, we use the Born-Oppenheimer approximation, where the potential between atoms can be approximated as a function of distance between the two nuclei, to study the four-quark bound states. By this approximation, Heitler and London calculated the spectrum of the hydrogen molecule, which includes two protons （heavy） and two electrons （light）. Cenerally, the observed exotic mesons Zb（10610）, ZD（10650）, Zc（3900） and Zc（4020）（Zc（4025）） may be molecular states made of two physical mesons and/or diquark-anti-diquark structures. Analogous to the Heitler-London method for calculating the mass of the hydrogen molecule, we investigate whether there exist energy minima for these two structures. Contrary to the hydrogen molecule case where only the spin-triplet possesses an energy minimum, there exist minima for both of these states. This implies that both molecule and tetraquark states can be stable objects. Since they have the same quantum numbers, however, the two states may mix to result in the physical states. A consequence would be that partner exotic states co-existing with ZD（10610）, Zb（]0650）, Zc（3900） and Zc（4020）（Zc（4025）） are predicted and should be experimentally observed.

关键词： exotic states Born-Oppenheimer approximation molecule tetraquark

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Predictions of γ(4S)→h_b(1P,2P)π^+π^- transitions

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Chinese Physics C 2020年第2期44卷 42-50页

作者：陈云华 School of Mathematics and Physics University of Science and Technology Beijing

We study the contributions of intermediate bottomonium-like Zb states and the bottom meson loops in the heavy quark spin flip transitionsγ(4 S)→hb(1 P,2 P)π+π-.Depending on the constructive or destructive interferences between the Zb-exchange and the bottom meson loops mechanisms,we predict two possible branching ratios for each process:BRγ(4 S)→hb(1 P)π+π-≈(1.***.40.8×10^-6)or(0.5-0.20.5×10^-6),and BRγ(4 S)→(2 P)π+π-≈(7.1-1.1+1.7×10^-10)or(2.4-0.10.2×10^-10)).The contribution of the bottom meson loops is found to be considerably larger than that of the Zbexchange in the T(4 S)→hb(1 P)ππtransitions,while its decay rates are not comparable to those of heavy quark spin conservedγ(4 S)→γ(1 S,2 S)ππprocesses.We also predict the contribution of the charm meson loops in the branch fractions ofΨ(3 S,4 S)→hc(1 P)ππ.

关键词： quarkonium exotic states nonrelativistic effective field theory

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Production of hidden-charm and hidden-bottom pentaquark states in electron-proton collisions

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Chinese Physics C 2021年第4期45卷 107-113页

作者：谢亚平曹须梁羽铁陈旭荣 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Institute of Quantum Matter South China Normal UniversityGuangzhou 510006China

Electro-production of several pentaquark states is investigated in this study.The eSTARlight package is adapted to study the electro-production of J/ψand γ(1S)via pentaquark P_(c)and P_(b)resonance channels in ep→eJ/ψp and ep→eγ(1S)p scattering processes at the proposed electron-ion colliders(EICs).The results obtained in this study are compared to those of non-resonance t-channels,which are described in the pomeron exchange model developed in our studies.Some pseudo-rapidity and rapidity distributions of J/ψand γ(1S)are presented for the proposed EICs,including EicC and EIC-US.It is found that EicC is a good platform to identify P_(b) states in the future.

关键词： electron-proton scattering exotic states vector meson production

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Experimental review of the T(1S,2S,3S)physics at e^(+)e^(-) colliders and the LHC

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Frontiers of physics 2020年第6期15卷 47-81页

作者： Sen Jia Xingyu Zhou Chengping Shen Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)and Institute of Modem Physics Fudan UniversityShanghai 200443China School of Physics and Information Engineering Shanxi Normal UniversityLinfen 041004China

The three lowest-lying r states,ie,r(1S),T(2S),and r(35),composed of b pairs and below the BB threshold,provide a good platform for the researches of hadronic physics and physics beyond the Standard Model.They can be produced directly in ete--colliding experiments,such as CLEO,Babar,and Belle,with low continuum backgrounds.In these experiments,many measurements of the exclusive r(1S)and r(2S)decays into light hadrons,which shed light on the"80%rule"for the Okubo-Zweig-lizuka suppressed decays in the bottomonium sector,were carried out.Meanwhile,many studies of the charmonium and bottomonium productions in r(1S,2S,3S)decays were performed,to distinguish different Quantum Chromodynamics(QCD)models.Besides,exotic states and new physics were also extensively explored in r(1S,2S,3S)decays at CLEO,BaBar,and Bell.The r(1S,2S,3S)states can also be produced in p collisions and in ollisions involving heavy ions.The precision measurements of their cross sections and polarizations at the large hadron collider(LHC),especially in the CMS,ATLAS,and LHCb experiments,help to understand r production mechanisms in Pp collisions.The observation of the sequential r suppession in heavy ion collisions at CMS,LHCb,and ALICE is of great importance for verifying the quark-gluon plasma predicted by QCD.In this article,we review the experimental results on T(1S,2S,3S)at e+e-colliders and the LHC,and summarize their prospects at Belle II and the LHC.

关键词： r(1S,2S,3S) hadronic decay radiative decay exotic states new physics cross section polarization quark-gluon plasma