Light scalars as tetraquarks: decays and mixing with quarkonia

Abstract

The tetraquark assignement for light scalar states below 1 GeV is discussed on the light of strong decays. The next-to-leading order in the large-N expansion for the strong decays is considered. Mixing with quarkonia states above 1 GeV is investigated within a chiral approach and the inclusion of finite-width effects is taken into account.

arXiv commentTalk given at the International School of Nuclear Physics, 29th Course, 'Quarks in Hadrons and Nuclei', Erice-Sicily, 16-24 September 2007. To appear in Prog. Part. Nucl. Phys. 10 pages, 1 figure

References in corpus (37)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Instantons in QCD
• Dyson-Schwinger equations: a tool for hadron physics
• Exotica
• Evidence that the a0(980) and f0(980) are not elementary particles
• A new look at scalar mesons
• Scalar mesons above and below 1 GeV
• Is $f_0(1500)$ a Scalar Glueball?
• On the nature of light scalar mesons from their large $N_c$ behavior
• Insight into the Scalar Mesons from a Lattice Calculation
• EVIDENCE FOR A SCALAR GLUEBALL
• Scalar Quarkonium Masses and Mixing with the Lightest Scalar Glueball
• Scalar nonet quarkonia and the scalar glueball: mixing and decays in an effective chiral approach
• Toy model for two chiral nonets
• Scalar Glueball-qqbar Mixing above 1 GeV and implications for Lattice QCD
• Light scalars as tetraquarks or two-meson states from large Nc and unitarized Chiral Perturbation Theory
• Unitarized pseudoscalar meson scattering amplitudes in three flavor linear sigma models
• Mixing of scalar tetraquark and quarkonia states in a chiral approach
• A schematic model for pentaquarks based on diquarks
• Scalar meson and glueball decays within a effective chiral approach
• On the spectral functions of scalar mesons
• Strong and electromagnetic decays of the light scalar mesons interpreted as tetraquark states
• Properties of the light scalar mesons face the experimental data on the $\varphi \to {\pi }^0{\pi }^0\gamma$ decay and the $\pi \pi$ scattering
• A covariant constituent quark/gluon model for the glueball-quarkonia content of scalar-isoscalar mesons
• Excited hadrons on the lattice: Mesons
• Isosinglet Scalar Mesons Below 2 GeV and the Scalar Glueball Mass
• Scalar meson in dynamical and partially quenched two-flavor QCD: lattice results and chiral loops
• Dalitz plot analysis of e+ e- --> pi0 pi0 gamma events at SQRT(s) ~ M(phi) with the KLOE detector
• Investigation of a0-f0 mixing
• Glueball-quarkonia content and decay of scalar-isoscalar mesons
• Insights on scalar mesons from their radiative decays
• Nucleon form factors and a nonpointlike diquark
• Propagators of light scalar mesons
• Decays of sigma, kappa, a0(980) and fo(980)
• A Diquark Chiral Effective Theory and Exotic Baryons
• Diquark Corrleations in the nucleon structure function