In the past years there has been a revival of hadron spectroscopy. Many interesting new
hadron states were discovered experimentally, some of which do not fit easily into the quark …

To better understand the nature and internal structure of the exotic states discovered by
many collaborations, more information on their electromagnetic properties and their strong …

We study spin 1/2 isoscalar and isovector candidates in both parity channels for the recently
discovered Θ+(1540) pentaquark particle in quenched lattice QCD. Our analysis takes into …

A review is given of the theoretical ideas concerning the mysterious pentaquark baryons
proposed during the first year after its discovery. We focus on the difficulties involved with the …

Exotic pentaquark baryon with strangeness+ 1, Θ+, is studied in the QCD sum rule
approach. We derive sum rules for the positive and negative parity baryon states with J= 1 2 …

Theoretically, some works have proposed the hadronic resonances Σ c (2800) and Λ c
(2940)+ to be S-wave DN and D* N molecular candidates, respectively. In the framework of …

We construct a complete classification of qqqq¯ q pentaquark states in terms of the spin-
flavour SU (6) representations. We find that only some definite SU (3) representations are …

We present a quenched lattice QCD calculation of spin-1/2 five-quark states with uudds¯
quark content for both positive and negative parities. We do not observe any bound …

We explore the phenomenology of, and models for, the Z* resonances, the lowest of which is
now well established, and called the Θ. We provide an overview of three models which have …

Understanding the production mechanism of exotic hadrons with the structures beyond
naive parton model can be helpful to find out their inner configuration and also to check the …