We survey the current status of light meson spectroscopy. We begin with a general introduction to meson spectroscopy and and its importance in understanding the physical states of Quantum Chromo Dynamics (QCD). Phemenological models of hadron spectroscopy are described with particular emphasis on the constituent quark model and the qualitative features it predicts for the meson spectrum. We nex...

The invariant mass spectrum of the e+e− and μ+μ− pairs from decays of light unflavored mesons with masses below the φ(1020)-meson mass to final states containing along with a dilepton pair one photon, one meson, and two mesons are calculated within the framework of the effective meson theory. The results can be used for simulations of the dilepton spectra in heavy-ion collisions and for experim...

The radiative meson decays V → Pγ and P → γγ are analyzed using the quark triangle diagram. Experimental data yield well determined estimates of the universal quark-antiquark-meson couplings gV qq̄′ and gPqq̄′ for the light meson sector. Also predictions for the ratios of neutral to charged heavy meson decay coupling constants are given and await experimental confirmation. 13.25.-k, 12.40.Vv, 13....

Diquarks are found to have the right degrees of freedom to describe the tetraquark poles in hiddencharm to open-charm meson-meson amplitudes. Compact tetraquarks result as intermediate states in non-planar diagrams of the 1/N expansion and the corresponding resonances are narrower than what estimated before. The proximity of tetraquarks to meson-thresholds has an apparent role in this analysis ...

We investigate how the masses of singly heavy baryons undergo changes in nuclear matter, based on a medium-modified SU(3) chiral soliton model. Having explained bulk properties we discuss matter. generalize vector-meson Lagrangian including heavy-meson interaction. The mass spectrum baryon are obtained with effects explicit symmetry breaking considered as perturbation. results show that medium ...

Lint ∼ g ψ̄B′ φψB , (1.1) where B′ is the resonance that decays into baryon B and meson φ and g is a coupling constant. It is crucial that this interaction Lagrangian is linear in the meson field. If φ is a pseudoscalar meson this interaction yields the decay width Γ (B′ → Bφ) ∝ g2|~ pφ|, with ~pφ being the momentum of the outgoing meson. The situation is significantly different in soliton model...

We propose a unified framework to describe the interactions of observed ${T}_{cc}$, ${P}_{c}$, and ${P}_{cs}$ within quark level interaction in our previous work. In this work, we generalize loosely bound hadronic molecules composed heavy flavor dihadrons with strangeness. predict possible ${D}^{(*)}{D}_{s}^{(*)}$ molecular states SU(3) limit masses ${P}_{c}$ as inputs. also investigate baryon-...

A new crossing symmetric unitarization scheme conveniently applied to meson-meson and meson-baryon scattering amplitudes is shortly proposed which can be not only used by theoreticians to unitarize arbitrary theoretical reaction amplitudes resulting from phenomenological Lagrangeans for mesons and baryons, yet also by experimentalists to generate realistic unitary fitting formulae for meson-mes...

We derive formulas for the decay constants fP and fV of pseudoscalar and vector mesons in the relativistic mock meson model. Using these formulas, we obtain fP and fV of Bs, Bd, Ds, and Dd mesons as functions of the mock meson parameter β. Then by using the values of β which are obtained by the variational method in the relativistic quark model, we obtain the decay constants fP and fV of the he...