Evidence of the four-quark nature of 
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 and 
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Achasov, N. N.; Bennett, J. V.; Киселев, А. В.; Kozyrev, E. A.; Shestakov, G. N.

doi:10.1103/physrevd.103.014010

Cited by 23 publications

(3 citation statements)

References 30 publications

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“…They are supposed to consist of two uncolored q q pairs and to be dynamically generated from K K interactions [25]. Achasov et al [26] provide arguments in favor of the tetraquark picture of the light scalar mesons.…”

Section: The Nonet Of Light Scalar Mesonsmentioning

confidence: 99%

Scalar mesons and the fragmented glueball

Klempt

2021

Preprint

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The center-of-gravity rule is tested for heavy and light-quark mesons. In the heavy-meson sector, the rule is excellently satisfied. In the light-quark sector, the rule suggests that the a 0 (980) could be the spin-partner of a 2 (1320), a 1 (1260), and b 1 (1235); f 0 (500) the spin-partner of f 2 (1270), f 1 (1285), and h 1 (1170); and f 0 (980) the spin-partner of f 2 (1525), f 1 (1420), and h 1 (1415). From the decay and the production of light scalar mesons we find a consistent mixing angle θ s = (14 ± 4) • . We conclude that f 0 (980) is likely "octet-like" in SU(3) with a slightly larger ss content and f 0 (500) is SU(3) "singlet-like" with a larger nn component. The a 0 (1450), K * 0 (1430), f 0 (1500) and f 0 (1370) are suggested as nonet of radial excitations. The scalar glueball is discussed as part of the wave function of scalar isoscalar mesons and not as additional "intruder". It seems not to cause supernumerosity.

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Section: The Nonet Of Light Scalar Mesonsmentioning

confidence: 99%

Scalar mesons and the fragmented glueball

Klempt

2021

Preprint

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“…These resonances with vacuum quantum numbers are crucial for the deep understanding of spontaneous chiral symmetry breaking of Quantum Chromodynamics (QCD), its spectroscopy and, in general, of its non-perturbative nature [10][11][12][13][14][15]. Along the decades the lightest scalar resonances have been accommodated within different models like tetraquark states [3,4,[16][17][18][19], molecular states [20][21][22][23][24], dynamically generated resonances [25][26][27][28][29][30], unitarized quark models [5,31,32], linear sigma models [33][34][35][36], etc.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the composite nature of the light scalar mesons $f_{0}(980)$ and $a_0(980)$

Wang,

Kang,

Oller

et al. 2022

Preprint

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We study the weight or compositeness of the ππ-K K and πη-K K in the composition of the f 0 (980) and a 0 (980) resonances, respectively. Either we use the saturation of the total width and compositeness, or we use a Flatté parameterization taking also into account the spectral function of a near-threshold resonance. We make connections and compare between these two methods. We take input values for the pole mass and width from several determinations in the literature. In addition, we take as third input either the total compositeness or the decay-width branching ratio to the lighter channel for each resonance. It turns out that for the poles considered the meson-meson components are dominant for the f 0 (980), while for the a 0 (980) resonance they are subdominant. We also provide partial decay widths and partial compositeness coefficients, so that the K K component is the most important one for the f 0 (980). Additionally, this study stresses the need to distinguish between the bare and dressed couplings and widths in a Flatté parameterization. We elaborate on the connection between the partial-decay widths calculated in terms of the dressed couplings and the actual measured ones. Due to the coupled-channel dynamics when the pole lies near the heavier threshold in the second Riemann sheet some changes are needed with respect to standard relations.

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“…A similar approach was used in Refs. [20,25] to describe the CLEO [1] and BESIII [10] data on the decays D + s → f 0 (980)e + ν e → π + π − e + ν e and D + → f 0 (500)e + ν e → π + π − e + ν e as well as the BESIII [26] data on the J/ψ → γπ 0 π 0 decay in the π 0 π 0 invariant mass region from the threshold up to 1 GeV. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Semileptonic decays $D\toηπe^+ν_e$ in the $a_0(980)$ region

Achasov,

Kiselev,

Shestakov

2021

Preprint

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Evidence of the four-quark nature of f0(980) and f0(500)

Cited by 23 publications

References 30 publications

Scalar mesons and the fragmented glueball

Scalar mesons and the fragmented glueball

Analysis on the composite nature of the light scalar mesons $f_{0}(980)$ and $a_0(980)$

Semileptonic decays $D\toηπe^+ν_e$ in the $a_0(980)$ region

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