Nature of the light scalar mesons

Abstract

Despite the apparent simplicity of meson spectroscopy, light scalar mesons cannot be accommodated in the usual $q\bar{q}$ structure. We study the description of the scalar mesons below 2 GeV in terms of the mixing of a chiral nonet of tetraquarks with conventional $q\bar{q}$ states. A strong diquark-antidiquark component is found for several states. The consideration of a glueball as dictated by quenched lattice QCD drives a coherent picture of the isoscalar mesons.

14 pages, 1 figure, accepted for publication in Phys. Rev. D

References in corpus (51)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• QCD forces and heavy quark bound states
• Exotica
• N/D Description of Two Meson Amplitudes and Chiral Symmetry
• A comprehensive lattice study of SU(3) glueballs
• Constituent quark model study of the meson spectra
• A new look at scalar mesons
• Scalar mesons above and below 1 GeV
• Non-perturbative Approach to effective chiral Lagrangians and Meson Interactions
• Is $f_0(1500)$ a Scalar Glueball?
• UNDERSTANDING THE SCALAR MESON $q\bar{q}$ NONET
• Resonances in $J/\psi \to \varphi {\pi }^{+}{\pi }^{-}$ and $\varphi K^{+}{K}^{-}$
• SU(N) gauge theories in 2+1 dimensions
• On the structure of the scalar mesons $f_0(975)$ and $a_0(980)$
• Efficient glueball simulations on anisotropic lattices
• Numerical Evidence for the Observation of a Scalar Glueball
• Quark-model study of few-baryon systems
• Static potentials and glueball masses from QCD simulations with Wilson sea quarks
• EVIDENCE FOR A SCALAR GLUEBALL
• Scalar Quarkonium Masses and Mixing with the Lightest Scalar Glueball
• Mechanism for a next-to-lowest lying scalar meson nonet
• Production of $f_0(1710)$, $f_0(1500)$, and $f_0(1370)$ in $J/\psi$ hadronic decays
• Scalar Glueball-qqbar Mixing above 1 GeV and implications for Lattice QCD
• Effective Functional Form of Regge Trajectories
• K-matrix analysis of the (IJ^{PC}=00^{++})-wave in the mass region below 1900 MeV
• Mixing of scalar glueballs and flavour-singlet scalar mesons
• A coupled channel analysis of the centrally produced K+K- and pi+pi- final states in pp interactions at 450 GeV/c
• A chiral model for bar{q}q and bar{q}bar{q}qq$ mesons
• A Glueball- $q\bar{q}$ Filter in Central Hadron Production
• Nonet Classification of Scalar/Isoscalar Resonances below 1900 MeV: the Existence of an Extra Scalar State in the Region 1200-1600 MeV
• Adjoint string breaking in 4d SU(2) Yang-Mills theory
• Systematics of quark-antiquark states and scalar exotic mesons
• Scalar Quarkonium and the Scalar Glueball
• Heavy Meson Description with a Screened Potential
• String Breaking in SU(2) Yang Mills Theory with Adjoint Sources
• Breaking of the adjoint string in 2+1 dimensions
• K0s K0s Final State in Two-Photon Collisions and Implications for Glueballs
• String Breaking as a Mixing Phenomenon in the SU(2) Higgs Model
• On nature of scalar a_0(980) and f_0(980)-mesons
• Search for the glueball candidates f0(1500) and fJ(1710) in gamma gamma collisions
• Further evidence for a large glue component in the f0(1500) meson
• Screened potential and the baryon spectrum
• Partial wave analysiss of pbar-p -> piminus-piplus, pizero-pizero, eta-eta and eta-etaprime
• Theorem on the Lightest Glueball State
• Light Scalar Mesons in the Improved Ladder QCD
• Systematics of quark-antiquark states: where are the lightest glueballs?
• Systematics of q anti-q states, scalar mesons and glueball
• Light Hadron Spectroscopy: Theory and Experiment
• Two photon decay of neutral scalars below 1.5 GeV in a chiral model for bar{q}q and bar{q}bar{q}qq states
• Analysis of nature of phi -> gamma pi0 eta and phi -> gamma pi0 pi0 decays
• Hadron 2001 Conference Summary: Theory

Cited by in corpus (56)

• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• From controversy to precision on the sigma meson: a review on the status of the non-ordinary $f_0(500)$ resonance
• Four-quark spectroscopy within the hyperspherical formalism
• Exotic meson-meson molecules and compact four--quark states
• Global aspects of the scalar meson puzzle
• Note on a sigma model connection with instanton dynamics
• QCD Tests of the Puzzling Scalar Mesons
• Are there compact heavy four-quark bound states?
• Light isovector resonances in ${\pi }^{-}p\to {\pi }^{-}{\pi }^{-}{\pi }^{+}p$ at 190 GeV/$c$
• Observation of a new narrow axial-vector meson $a_1(1420)$
• Open-charm meson spectroscopy
• Mass Uncertainties of f0(600) and f0(1370) and their Effects on Determination of the Quark and Glueball Admixtures of the I=0 Scalar Mesons
• Dynamical study of $\mathbf{QQ}-\bar{\mathbf{u}}\bar{\mathbf{d}}$ mesons
• Dynamical Stabilization of the Fermi Scale: Phase Diagram of Strongly Coupled Theories for (Minimal) Walking Technicolor and Unparticles
• Do $c\bar{c}n\bar{n}$ bound states exist?
• Two chiral nonet model with massless quarks
• Study of $K_0^{\ast }(1430)$ and $a_0(980)$ from $B\to K_0^{\ast }(1430)\pi$ and $B\to a_0(980)K$ Decays
• Identification of non-ordinary mesons from the dispersive connection between their poles and their Regge trajectories: the f0(500) resonance
• Tetraquark Spectroscopy: A Symmetry Analysis
• Model for light scalars in QCD
• Determination of $f_0-\sigma$ mixing angle through $B_s^0\to J/\Psi f_0(980)(\sigma )$ decays
• Chiral Nonet Mixing in pi pi Scattering
• Excited Scalar and Pseudoscalar Mesons in the Extended Linear Sigma Model
• New Members in the $0^{+}$ ($0^{++})$ Family
• Gauged linear sigma model and pion-pion scattering
• Meson and glueball spectra with the relativistic flux tube model
• Kaon and strangeonium spectrum in Regge phenomenology
• Alternative Large Nc Schemes and Chiral Dynamics
• Study of scalar meson f_0(980) and K_0^*(1430) from B \to f_0(980)ρ(ω, ϕ) and B \to K^*_0(1430)ρ(ω) Decays
• A multiquark description of the $D_{sJ}(2860)$ and $D_{sJ}(2700)$
• Enhanced non-quark-antiquark and non-glueball Nc behavior of light scalar mesons
• Chiral Nonet Mixing in ${\eta }^{\prime }\to \eta \pi \pi$ Decay
• Radiative decays with light scalar mesons and singlet-octet mixing in ChPT
• Semi-leptonic $D_s^{+}$(1968) decays as a scalar meson probe
• Study of scalar meson $a_0(980)$ from $B\to a_0(980)\pi$ Decays
• Implications of Family Nonuniversal $Z^{\prime }$ Model on B -->K_0^* pi Decays
• Are three flavors special?
• Dispersive calculation of complex Regge trajectories for the lightest $f_2$ resonances
• Probing the substructure of $f_0(1370)$
• Proximity of $f_0(1500)$ and $f_0(1710)$ to the scalar glueball
• QCD quark cyclobutadiene and light tetraquark spectrum
• Branching Ratio and CP Asymmetry of B_s \to K^*_0(1430)ρ(ω,ϕ) Decays in the PQCD Approach
• Study of scalar meson a_0(1450) from B \to a_0(1450)K^* Decays
• Fall-apart decays of polyquark hadrons
• Chiral Nonet Mixing in $\pi K$ Scattering
• Dynamical study of the light scalar mesons below 1 GeV in a flux-tube model
• Probing scalar mesons in semi-leptonic decays of $D_s^{+}$, $D^{+}$ and $D^0$
• Branching Ratio and CP Asymmetry of B_s \to K^*_0(1430)πDecays in the PQCD Approach
• Electromagnetic trace anomaly in a generalized linear sigma model
• Exploration of a physical picture for the QCD scalar channel
• Chiral Nonet Mixing in $\pi \eta$ Scattering
• Study of f_0(980) and f_0(1500) from B_s \to f_0(980)K, f_0(1500)K Decays
• Scrutinizing $B^0$-meson flavor changing neutral current decay into scalar $K_0^{\ast }(1430)$ meson with $b\to s{\ell }^{+}{\ell }^{-}(\nu \bar{\nu })$ transition
• Two-body decay widths of lowest lying and next-to-lowest lying scalar and pseudoscalar mesons in generalized linear sigma model
• Study of f_0(980) and f_0(1500) from B_s \to f_0(980)π, f_0(1500)πDecays
• Understanding open-charm mesons