The analysis of the mass spectrum and the calculation of the strong decay of P-wave charmonium states strongly purport to explain the newly observed X(3915) and X(4350) as new members in the P-wave charmonium family, i.e., chi{c0}{'} for X(3915) and chi{c2}{''} for X(4350). Under the P-wave charmonium assignment to X(3915) and X(4350), the J{PC} quantum numbers of X(3915) and X(4350) must be 0{++} and 2{++} respectively, which provide important criteria to test the P-wave charmonium explanation for X(3915) and X(4350) proposed by this Letter. The decay behavior of the remaining two P-wave charmonium states with the second radial excitation is predicted, and an experimental search for them is suggested.

We perform a systematic study of the possible loosely bound states composed of two charmed baryons or a charmed baryon and an anti-charmed baryon within the framework of the one boson exchange (OBE) model. We consider not only the π exchange but also the η, ρ, ω, φ and σ exchanges. The S − D mixing effects for the spin-triplets are also taken into account. With the derived effective potentials, we calculate the binding energies and root-mean-square (RMS) radii for the systems ΛcΛc(Λc), ΞcΞc(Ξc), ΣcΣc(Σc), Ξ

In the framework of the one-boson-exchange model, we have performed an extensive study of the possible B*B̄, B*B̄*, D*D̄, D*D̄* molecular states with various quantum numbers after considering the S-wave and D-wave mixing. We also discuss the possible experimental research of these interesting states.