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 as a 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover accent="true"><mml:mi>D</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:msup><mml:mi>D</mml:mi><mml:mo>*</mml:mo></mml:msup></mml:math>
 molecule from the pole counting rule

Gong, Qin-Rong; Guo, Zhi-Hui; Meng, Ce; Tang, G. Y.; Wang, Yu-Fei; Zheng, Han-Qing

doi:10.1103/physrevd.94.114019

Cited by 35 publications

(25 citation statements)

References 73 publications

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“…On the other hand, in analogy to Z b (10610) and Z b (10650), Z c (3900) and Z c (4020) have masses very close to the the DD * and D * D * thresholds, respectively, and they couple most prominently to these open-flavor channels regardless of the significant phase space suppression (Ablikim et al, 2014a(Ablikim et al, ,b, 2015c. The two Z c states are also widely regarded as hadronic molecules (Chen et al, 2015e;Cui et al, 2014;Dong et al, 2013b;Gong et al, 2016a;Guo et al, 2013b;He et al, 2013;Karliner and Rosner, 2015a;Ke et al, 2013;Li, 2013;Voloshin, 2013;Wang et al, 2013a;Wilbring et al, 2013;Zhang, 2013). Analogous to the Z b case, the experimental analyses of the two Z c states based on sums of BW distributions result in masses above the continuum thresholds as well.…”

Section: X(3872)mentioning

confidence: 99%

Hadronic molecules

et al. 2018

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A large number of experimental discoveries especially in the heavy quarkonium sector that did not at all fit to the expectations of the until then very successful quark model led to a renaissance of hadron spectroscopy. Among various explanations of the internal structure of these excitations, hadronic molecules, being analogues of light nuclei, play a unique role since for those predictions can be made with controlled uncertainty. We review experimental evidences of various candidates of hadronic molecules, and methods of identifying such structures. Nonrelativistic effective field theories are the suitable framework for studying hadronic molecules, and are discussed in both the continuum and finite volumes. Also pertinent lattice QCD results are presented. Further, we discuss the production mechanisms and decays of hadronic molecules, and comment on the reliability of certain assertions often made in the literature.

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Section: X(3872)mentioning

confidence: 99%

Hadronic molecules

et al. 2018

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“…In Refs. [28][29][30][31], the mass invariant mass spectra was explicitly studied and fitted, and the poles corresponding to the Z c (3900)/Z c (3885) were extracted, especially in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we focus on the invariant mass spectrum near theD D * threshold and the πJ/ψ interaction is suppressed by the OZI rule, The explicit calculation in our model also suggests that the intermediate π J/ψ channel will be suppressed and D * − D 0 channels in the loop between direct decay vertex and the rescattering from beginning, which was also adopted in Ref. [31]. When calculating the rescattering amplitude T ,…”

mentioning

confidence: 99%

“…In Refs. [28][29][30][31], the mass invariant mass spectra was explicitly studied and fitted, and the poles corresponding to the Z c (3900)/Z c (3885) were extracted, especially in Ref.[28] the analysis suggested the Z c (3885)/Z c (3900) maybe originate from a virtual state. However, in theses studies, all coupling constants of the interactions were chosen as free parameters.…”

mentioning

confidence: 99%

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$$Z_c(3900)/Z_c(3885)$$ Z c ( 3900 ) / Z c ( 3885 ) as a virtual state from $$\pi J/\psi -\bar{D}^*D$$ π J / ψ - D ¯ ∗ D interaction

Chen

2018

Eur. Phys. J. C

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In this work, we study the πJ/ψ andD * D invariant mass spectra of the Y (4260) decay to find out the origin of the Z c (3900) and Z c (3885) structures. The πJ/ψ − D * D interaction is studied in a coupled-channel quasipotential Bethe-Saltpeter equation approach, and embedded to the Y (4260) decay process to reproduce both π − J/ψ and D * − D 0 invariant mass spectra observed at BESIII simultaneously. It is found out that a virtual state at energy about 3870 MeV is produced from the interaction when both invariant mass spectra are comparable with the experiment. The results support that both Z c (3900) and Z c (3885) have the same origin, that is, a virtual state from πJ/ψ −D * D interaction, in which theD * D interaction is more important and the coupling betweenD * D and πJ/ψ channels plays a minor role. IntroductionIn recent years, many exotic resonance structures were observed near the threshold of two hadrons, which are difficult to put into the conventional quark model. The exotic resonance structures near theD * D threshold (in this work we will remark hidden charmed system with a vector D * /D * meson and a pseudoscalarD/D meson asD * D if the explicit is not necessary) are good examples of such phenomena. The first XY Z particle, X (3872) is almost on theD * D threshold, which was interpreted as aD * D hadronic molecular state immediately after its observation [1,2]. Later, an isovector resonant structure named Z ± c (3900) was observed in 2013 at BESIII and Bell in the π ± J/ψ invariant mass spectrum of e + e − → π + π − J/ψ at √ s = 4.26 GeV [3,4], and further confirmed at CLEO-c in the same channel at √ s = 4.17 GeV [5]. The observed Z c (3900) is also near theD * D threshold, thus, it is natural to explain it as an isovector partner of X (3872) in theD * D molecular scenario and expected to be observed in the (D * D) I =1 channel. It was confirmed by the a e-mail: junhe@njnu.edu.cn observation of Z c (3885) in the DD * invariant mass spectrum of Y (4260) decay in process e + e − → π ± (DD * ) ∓ [6]. Recently, the neutral partners of Z ± c (3900) and Z ± c (3885) were also observed at BESIII [7,8]. Besides, the spin parity of these state has been determined as J P = 1 + by a partial wave analysis [9].Thanks to the experiments at BESIII, Belle and CLEOc, the isovector Z c (3900)/Z c (3885) has been established. Since the Z ± c (3900)/Z ± c (3885) carries a charge, it cannot be explained as a cc state, which must be neutral. After the observation at BESIII, many interpretations of the origin of Z c (3900)/Z c (3885) have been proposed, which includes the hadronic molecular state [10][11][12][13][14], tetraquark state [15][16][17], initial-single-pion-emission mechanism [18,19], cusp effect from triangle singularity [20]. And its decays were also studied though intermediate meson loop [21][22][23]. Due to its closeness to theD * D threshold, the hadronic molecular state is an important picture to explain the Z c (3900)/Z c (3885) structure. In Refs. [24,25], theD * D interaction as well as the...

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“…Indeed, there are attempts to treat it as the tightly bound diquark-antidiquark state [27][28][29][30], as the four-quark bound state composed of conventional mesons [31][32][33][34][35][36][37][38][39], or as the threshold cusp [40,41].…”

Section: Introductionmentioning

confidence: 99%

Treating Zc(3900) and Z(4430) as the ground state and first radially excited tetraquarks

2017

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Exploration of the resonances Zc(3900) and Z(4430) are performed by assuming that they are ground-state and first radial excitation of the same tetraquark with J P = 1 + . The mass and current coupling of the Zc(3900) and Z(4430) states are calculated using QCD two-point sum rule method by taking into account vacuum condensates up to eight dimensions. We investigate the vertices ZcM h M l and ZM h M l , with M h and M l being the heavy and light mesons, and evaluate the strong couplings gZ cMhMl and gZM h M l using QCD sum rule on the light cone. The extracted couplings allow us to find the partial width of the decays Zc(3900) → J/ψπ; ψ ′ π; ηcρ and Z(4430) → ψ ′ π; J/ψπ; η ′ c ρ; ηcρ, which may help in comprehensive investigation of these resonances. We compare width of the decays of Zc(3900) and Z(4430) resonances with available experimental data as well as existing theoretical predictions.

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Zc(3900) as a D¯D* molecule from the pole counting rule

Cited by 35 publications

References 73 publications

Hadronic molecules

Hadronic molecules

$$Z_c(3900)/Z_c(3885)$$ Z c ( 3900 ) / Z c ( 3885 ) as a virtual state from $$\pi J/\psi -\bar{D}^*D$$ π J / ψ - D ¯ ∗ D interaction

Treating Zc(3900) and Z(4430) as the ground state and first radially excited tetraquarks

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