Possibility of charmoniumlike state X(3915) as χc0(2P) state

In this work, we seriously discuss whether X(3915) can be treated as a χc0(2P) state. Based on an unquenched quark model, we give the mass spectrum of the χcJ(2P) states, where there are no free input parameters in our calculation. Our result shows that the mass gap between χc0(2P) and χc2(2P) can reach 13 MeV, which can reproduce the mass difference between Z(3930) and X(3915). Additionally, the calculated masses of χc0(2P) and χc2(2P) are consistent with experimental values of X(3915) and Z(3930), respectively. Besides, giving the mass spectrum analysis to support X(3915) as χc0(2P), we also calculate the width of χc0(2P) with the same framework, which is also consistent with the experimental data of X(3915). Thus, the possibility of charmoniumlike state X(3915) as χc0(2P) state is further enforced.