New Look at Scalar Mesons

Maiani, L.; Piccinini, F.; Polosa, A. D.; Riquer, V.

doi:10.1103/physrevlett.93.212002

Cited by 410 publications

(469 citation statements)

References 21 publications

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“…A diquark-antidiquark model was proposed in Ref. [382] by Maiani, Piccinini, Polosa, and Riquer to explain the X(3872), based on their previous studies on the lightest scalar mesons [567]. We note that this is the "type-I" diquark-antidiquark model, and the "type-II" diquark-antidiquark model [385] has been reviewed in Sec.…”

Section: Molecular Schemementioning

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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Section: Molecular Schemementioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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“…Suggestions about a diquark-antidiquark structure of the light scalar mesons including f 0 ð980Þ one were made on the basis of new theoretical analysis in Refs. [10,11], as well.…”

Section: Introductionmentioning

confidence: 99%

New a1(1420) state: Structure, mass, and width

2018

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The structure, spectroscopic parameters and width of the resonance with quantum numbers J PC ¼ 1 þþ discovered by the COMPASS Collaboration and classified as the a 1 ð1420Þ meson are examined in the context of QCD sum rule method. In the calculations the axial-vector meson a 1 ð1420Þ is treated as a fourquark state with the diquark-antidiquark structure. The mass and current coupling of a 1 ð1420Þ are evaluated using QCD two-point sum rule approach. Its observed decay mode a 1 ð1420Þ → f 0 ð980Þπ, and kinematically allowed ones, namely a 1 → K ÃAE K ∓ , a 1 → K Ã0K0 and a 1 →K Ã0 K 0 channels are studied employing QCD sum rules on the light-cone. Our prediction for the mass of the a 1 ð1420Þ state m a 1 ¼ 1416

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“…Among the exotic hadrons, four-quark state scenarios are of both theoretical and experimental interest. A four-quark state was predicted to exist early in a consistent description of the hadron scattering amplitudes [1], and their properties have been studied in many models [2,3,4,5,6,7,8,9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Diquark and light four-quark states

2007

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Four-quark states with different internal clusters are discussed within the constituent quark model. It is pointed out that the diquark concept is not meaningful in the construction of a tetraquark interpolating current in the QCD sum rule approach, and hence existing sum-rule studies of fourquark states are incomplete. An updated QCD sum-rule determination of the properties of diquark clusters is then used as input for the constituent quark model to obtain the masses of light 0 ++ tetraquark states (i.e. a bound state of two diquark clusters). The results support the identification of σ(600), f0(980) and a0(980) as the 0 ++ light tetraquark states, and seem to be inconsistent with the tetraquark state interpretation of the new BES observations of the near-threshold pp enhancements, X(1835) and X(1812), with the possible exception that X(1576) may be an "exotic" first orbital excitation of f0(980) or a0(980).

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New Look at Scalar Mesons

Cited by 410 publications

References 21 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

New a1(1420) state: Structure, mass, and width

Diquark and light four-quark states

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