Masses and decay properties of excited charmonia states

Charmonium has proved a remarkable laboratory for the study of quantum chromodynamics (QCD). The study of its spectrum provides fundamental information about the interquark potential. Since the hadron spectrum cannot be obtained directly from QCD, one has to use other methods like potential model calculations, lattice gauge theory, effective field theory, etc. to investigate hadron spectrum and its decays. Phenomenological potential models are still one of the important tools to study the hadron spectrum and its decays. These models are either relativistic or non-relativistic. The non-relativistic quark model is commonly employed for knowing the behavior of heavy hadron as this approximation provides a good description of static properties of heavy mesons such as mass spectra, while for dynamical properties such as decay, the relativistic corrections are considered