Evidence of the four-quark nature of $f_0(980)$ and $f_0(500)$

Abstract

There exists a great deal of concrete evidence in favor of the exotic four-quark nature of light scalars. At the same time, the further expansion of the area of the $q^2{\bar{q}}^2$ model validity for light scalars on ever new processes seems extremely interesting and important. We analyze the BESIII data on the decay $J/\psi \to \gamma {\pi }^0{\pi }^0$ and show that the results of this high-statistics experiment can be interpreted in favor of the four-quark nature of light scalar mesons $f_0(980)$ and $f_0(500)$.

6 pages, 3 figures, v2: improved discussion, references corrected, matched the pudlished version in Phys. Rev. D

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• Semileptonic decays $D\to {\pi }^{+}{\pi }^{-}{e}^{+}{\nu }_e$ and $D_s\to {\pi }^{+}{\pi }^{-}{e}^{+}{\nu }_e$ as the probe of constituent quark-antiquark pairs in the light scalar mesons
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Cited by in corpus (14)

• Scalar mesons and the fragmented glueball
• Dispersive analysis of glueball masses
• Scalar resonances in the $D^{+}\to K^{-}{K}^{+}{K}^{+}$ decay
• Analysis on the composite nature of the light scalar mesons $f_0(980)$ and $a_0(980)$
• Molecular nature of the $a_1$(1260) axial-vector meson
• Semileptonic decays $D\to \eta \pi e^{+}{\nu }_e$ in the $a_0(980)$ region
• Study of light scalar mesons through $D_s^{+}\to {\pi }^0{\pi }^0{e}^{+}{\nu }_e$ and $K_S^0{K}_S^0{e}^{+}{\nu }_e$ decays
• Observation of abnormal suppression of ${\mathrm{f}}_0$(980) production in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Amplitude analysis of the $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decay and measurement of the ${\pi }^{-}{\pi }^{+}$ S-wave amplitude
• The structure of the f_0(980) from system size dependent hadronic resonance ratios in p+p, p+Pb, and Pb+Pb collisions at the LHC
• ${\mathrm{f}}_0(980)$ production in inelastic pp collisions at $\sqrt{s}=5.02$ TeV
• Phenomenological description of the ${\pi }^{-}{\pi }^{+}$ $S$-waves in $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ and $D_s^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decays: The problem of phases
• The theoretical study of $D_s^{+}\to {\pi }^{+}{\pi }^0{\pi }^0$
• New physics particles mixing with mesons: production in the fragmentation chain