New hadron states

The past four years has witnessed the renaissance of the hadron spectroscopy. Many interesting new hadron states were discovered experimentally, some of which do not fit into the quark model easily. I will give a concise overview of these states and their possible interpretations. Topics covered in this review are: (1) candidates of new light hadrons including

p {\bar p}

threshold enhancement, X(1835), X(1576),

f_0(1810)

, recent candidates of the

1^{-+}

exotic mesons, Y(2175),

p\bar\Lambda

threshold enhancement etc/ (2) charmed mesons including p-wave non-strange charmed mesons,

D_{sj}(2317)

and

D_{sj}(2460)

, recent candidates of higher excited charmed mesons,

D_{sj}(2632)

etc/ (3) charmonium and charmonium-like states such as X(3872), Y(4260), X(3940), Y(3940), Z(3930) etc. The effect from the nearby S-wave open channels on the quark model spectrum above or near strong decay threshold is emphasized. Dynamical lattice simulations of

D K

and

D^0\bar D^{\ast 0}

scattering and the extraction of their phase shifts may help resolve the underlying structure of

D_{sj}(2317)

,

D_{sj}(2460)

and X(3872).

New hadron states
threshold enhancement
coupled-channel effect
review
hadron spectroscopy
electron positron: annihilation
J/psi(3100): decay modes
photon photon: interaction
glueball
meson: hybrid

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