Determination of the Spin and Parity of the 
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doi:10.1103/physrevlett.119.072001

Cited by 102 publications

(71 citation statements)

References 33 publications

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“…This would be compatible with an I=0 isosinglet assignment for the Y (4260), which would imply that there is no charged partner of the Y (4260). Using a partial wave analysis, the spin and parity were finally determined to 1 + with a statistical preference of more than 7σ over all other quantum numbers [243].…”

Section: Z States Of Type II In the Charmonium Mass Regimementioning

confidence: 99%

Exotics: Heavy pentaquarks and tetraquarks

Ali¹,

Lange

Stone

2017

Progress in Particle and Nuclear Physics

586

402

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For many decades after the invention of the quark model in 1964 there was no evidence that hadrons are formed from anything other than the simplest pairings of quarks and antiquarks, mesons being formed of a quark-antiquark pair and baryons from three quarks. In the last decade, however, in an explosion of data from both e + e − and hadron colliders, there are many recently observed states that do not fit into this picture. These new particles are called generically "exotics". They can be either mesons or baryons. Remarkably, they all decay into at least one meson formed of either a cc or bb pair. In this review, after the introduction, we explore each of these new discoveries in detail first from an experimental point of view, then subsequently give a theoretical discussion. These exotics can be explained if the new mesons contain two-quarks and twoantiquarks (tetraquarks), while the baryons contain four-quarks plus an antiquark (pentaquarks). The theoretical explanations for these states take three divergent tracks: tightly bound objects, just as in the case of normal hadrons, but with more constituents, or loosely bound "molecules" similar to the deuteron, but formed from two mesons, or a meson or baryon, or more wistfully, they are not multiquark states but appear due to kinematic effects caused by different rescatterings of virtual particles; most of these models have all been post-dictions. Both the tightly and loosely bound models predict the masses and related quantum numbers of new, as yet undiscovered states. Thus, future experimental discoveries are needed along with theoretical advances to elucidate the structure of these new exotic states.

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Section: Z States Of Type II In the Charmonium Mass Regimementioning

confidence: 99%

Exotics: Heavy pentaquarks and tetraquarks

Ali¹,

Lange

Stone

2017

Progress in Particle and Nuclear Physics

586

402

View full text Add to dashboard Cite

show abstract

“…The quark content of the charged hidden-charm or hidden-bottom mesons should be at least four if their nonresonance interpretations are excluded. Up to now, experiments have observed several charged structures, Z c (4430) [16][17][18], Z c (4050) [19], Z c (4250) [19], Z c (3900) [20][21][22][23][24], Z c (3885) [25][26][27], Z c (4020) [28,29], Z c (4025) [30,31], and so on. Very recently, LHCb found the evidence for a charged charmonium-like resonance Z − c (4100) in the decay B 0 → Z − c (4100)K + → η c π − K + [32].…”

Section: Introductionmentioning

confidence: 99%

Systematic studies of charmonium-, bottomonium-, and Bc -like tetraquark states

Liu

et al. 2019

Phys. Rev. D

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We study the mass splittings of Q1q2Q3q4 (Q = c, b, q = u, d, s) tetraquark states with chromomagnetic interactions between their quark components. Assuming that X(4140) is the lowest J P C = 1 ++ cscs tetraquark, we estimate the masses of the other tetraquark states. From the obtained masses and defined measure reflecting effective quark interactions, we find the following assignments for several exotic states: (1) both X(3860) and the newly observed Zc(4100) seem to be 0 ++ cncn tetraquarks; (2) Zc(4200) is probably a 1 +− cncn tetraquark; (3) Zc(3900), X(3940), and X(4160) are unlikely compact tetraquarks; (4) Zc(4020) is unlikely a compact tetraquark, but seems the hidden-charm correspondence of Z b (10650) with J P C = 1 +− ; and (5) Zc(4250) can be a tetraquark candidate but the quantum numbers cannot be assigned at present. We hope further studies may check the predictions and assignments given here.

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Section: Introductionmentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

$$Z_c(3900)/Z_c(3885)$$ 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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Determination of the Spin and Parity of the Zc(3900)

Cited by 102 publications

References 33 publications

Exotics: Heavy pentaquarks and tetraquarks

Exotics: Heavy pentaquarks and tetraquarks

Systematic studies of charmonium-, bottomonium-, and Bc -like tetraquark states

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

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