${{\boldsymbol X}{(3915)}}$ $I^G(J^{PC})$ = $0^+(0 or 2^{+ +})$
was ${{\mathit \chi}_{{c0}}{(3915)}}$
The experimental analysis prefers $\mathit J{}^{PC} = 0{}^{++}$. However, a reanalysis presented in ZHOU 2015C shows that if helicity-2 dominance assumption is abandoned and a sizable helicity-0 component is allowed, a $\mathit J{}^{PC} = 2{}^{++}$ assignment is possible.