Issues and Opportunities in Exotic Hadrons

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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“…Prospects for future searches have been recently exposed in [296,297]. X(3872) to stress its mysterious nature.…”

Section: A Travel Guide To Experimental Resultsmentioning

confidence: 99%

Multiquark resonances

2017

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“…Interested readers may also consult reviews in Refs. [40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,39].…”

Section: General Status Of Hadron Spectroscopymentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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“…There is considerable current theoretical and experimental interest in the study of the interactions of charmed hadrons with light hadrons and atomic nuclei [1][2][3]. There is special interest in the properties of D mesons in nuclear matter [4], mainly in connection with D−mesic nuclei [5][6][7][8], J/Ψ and η c binding to nuclei [9][10][11][12], and N D molecules [13].…”

Section: Introductionmentioning

confidence: 99%

Strong couplings and form factors of charmed mesons in holographic QCD

2017

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We extend the two-flavor hard-wall holographic model of Erlich, Katz, Son and Stephanov [Phys. Rev. Lett. 95, 261602 (2005)] to four flavors to incorporate strange and charm quarks. The model incorporates chiral and flavor symmetry breaking and provides a reasonable description of masses and weak decay constants of a variety of scalar, pseudoscalar, vector and axial-vector strange and charmed mesons. In particular, we examine flavor symmetry breaking in the strong couplings of the ρ meson to the charmed D and D * mesons. We also compute electromagnetic form factors of the π, ρ, K, K * , D and D * mesons. We compare our results for the D and D * mesons with lattice QCD data and other nonperturbative approaches.

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Issues and Opportunities in Exotic Hadrons

Cited by 75 publications

References 179 publications

Multiquark resonances

Multiquark resonances

The hidden-charm pentaquark and tetraquark states

Strong couplings and form factors of charmed mesons in holographic QCD

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