A large number of experimental discoveries especially in the heavy quarkonium sector that
did not meet the expectations of the until then very successful quark model led to a …

In the past decade many charmonium-like states were observed experimentally. Especially
those charged charmonium-like Z c states and bottomonium-like Z b states cannot be …

Chiral symmetry and its spontaneous breaking play an important role both in the light
hadron and heavy hadron systems. The chiral perturbation theory (χ PT) is the low energy …

In the past two decades, a plethora of hadronic states beyond the conventional quark model
of qq ̄ mesons and qqq baryons have been observed experimentally, which motivated …

In this review, we present the current state of the art of our understanding of the spectrum of
excited strongly interacting particles and discuss methods that allow for a systematic and …

The existence and properties of the sigma meson have been controversial for almost six
decades, despite playing a central role in the spontaneous chiral symmetry of QCD or in the …

Using a chiral unitary approach for the meson–baryon interactions, we show that two octets
of Jπ= 1/2− baryon states, which are degenerate in the limit of exact SU (3) symmetry, and a …

The most general structure of an elastic partial wave amplitude when the unphysical cuts are
neglected is deduced in terms of the N/D method. This result is then matched to lowest …

Abstract Very recently, the LHCb Collaboration reported their new results about the
pentaquarks at charm energy region. Based on the new experimental results, we recalculate …

A bstract We investigate rare semileptonic\(\overline {B}\to {{\overline {K}}^{*}}{\ell^{+}}{\ell^{-
}}\) decays, providing a comprehensive treatment of theoretical uncertainties in the low-q 2 …