Exotic Hadrons: Review and Perspectives

Richard, Jean‐Marc

doi:10.1007/s00601-016-1159-0

Cited by 185 publications

(128 citation statements)

References 283 publications

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“…A different and very interesting viewpoint is given by Rossi and Veneziano [79,80,83]. The consequences of color dynamics and Rosner duality for exotic states are reviewed in [102]. Lastly, the problem of light tetraquarks have been approached from a field theoretical point of view using the Dyson-Schwinger formalism in [103].…”

Section: General Featuresmentioning

confidence: 99%

Multiquark resonances

2017

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Multiquark resonances are undoubtedly experimentally observed. The number of states and the amount of details on their properties have been growing over the years. It is very recent the discovery of two pentaquarks and the confirmation of four tetraquarks, two of which had not been observed before. We mainly review the theoretical understanding of this sector of particle physics phenomenology and present some considerations attempting a coherent description of the so called X and Z resonances. The prominent problems plaguing theoretical models, like the absence of selection rules limiting the number of states predicted, motivate new directions in model building. Data are reviewed going through all of the observed resonances with particular attention to their common features and the purpose of providing a starting point to further research.

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Section: General Featuresmentioning

confidence: 99%

Multiquark resonances

2017

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“…In 2003, experimentalists opened the Pandora's box for exotic states through the observation of X(3872) [2]. Since then, more and more unexpected XYZ states were observed and the situation for hadron physics study became complicated [3][4][5][6][7][8][9][10][11][12]. To understand a little more the above mentioned problem, the discussions in this work aim at basic features of ground charmonium-like, bottomonium-like, and B c -like tetraquark states with even P -parities.…”

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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“…In the past decade, the reported charmonium-like states like X (3872) [1], Y (3940) [2], Y (4140) [3,4], Z + (4430) [5], and Z + c (4200) [6], the bottomonium-like states Z b (10610) and Z b (10650) [7], and the open-heavy flavor meson X (5568) [8] have stimulated extensive discussions on their exotic assignments. The interested reader may refer to the recent literature [9][10][11][12][13][14][15] for the comprehensive review of progress.…”

Section: Introductionmentioning

confidence: 99%

Exotic tetraquark states with the $$qq\bar{Q}\bar{Q}$$ q q Q ¯ Q ¯ configuration

et al. 2017

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In this work, we study systematically the mass splittings of the qqQQ (q = u, d, s and Q = c, b) tetraquark states with the color-magnetic interaction by considering color mixing effects and estimate roughly their masses. We find that the color mixing effect is relatively important for the J P = 0 + states and possible stable tetraquarks exist in the nnQQ (n = u, d) and nsQQ systems either with J = 0 or with J = 1. Possible decay patterns of the tetraquarks are briefly discussed.

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Exotic Hadrons: Review and Perspectives

Abstract: The physics of exotic hadrons is revisited and reviewed, with emphasis on flavour configurations which have not yet been investigated. The constituent quark model of multiquark states is discussed in some detail, as it can serve as a guide for more elaborate approaches.

Cited by 185 publications

References 283 publications

Multiquark resonances

Multiquark resonances

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

Exotic tetraquark states with the $$qq\bar{Q}\bar{Q}$$ q q Q ¯ Q ¯ configuration

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