Charmonium spectroscopy motivated by general features of pNRQCD

Mass spectrum of charmonium is computed in the framework of potential non-relativistic quantum chromodynamics. $\mathit{\text{O}}$$(1\mathrm{/}m)$ and $\mathit{\text{O}}$$(1\mathrm{/}{m}^2)$ relativistic corrections to the Cornell potential and spin-dependent potential have been added, and is solved numerically. New experimentally observed and modified positive and negative parity states like $\mathit{\psi }(4230)$, $\mathit{\psi }(4260)$, ${{\boldsymbol \psi}{(4360)}}$,${{\boldsymbol \psi}{(4390)}}$,${{\boldsymbol \psi}{(4660)}}$,${{\boldsymbol \chi}{{c1}}{(4140)}}$and${{\boldsymbol \chi}{{c1}}{(4274)}}$ near open-flavor threshold have also been studied. We explain them as admixtures of S-D wave states and P-wave states. Apart from these states, some other states like $X(3915)$, ${{\boldsymbol \chi}_{{c1}}{(3872)}}$,${{\boldsymbol \psi}{(3770)}}$and${{\boldsymbol \psi}{(4160)}}$havebeenidentifiedas$2^3P_0$,$2^3P_1$,$1^3D_1$and$2^3D_1$states\mathrm{.}Subsequently,theelectromagnetictransitionwidthsand$\gamma\gamma$,$e^+e^-$,lighthadronand$\gamma\gamma\gamma$ decay widths of several states are calculated at various leading orders. All the calculated results are compared with experimental and results from various theoretical models.