${\boldsymbol {\boldsymbol c}}$ ${\boldsymbol {\overline{\boldsymbol c}}}$ MESONS(including possibly non- ${\boldsymbol {\boldsymbol q}}$ ${\boldsymbol {\overline{\boldsymbol q}}}$ states) INSPIRE search

# ${{\boldsymbol X}{(3915)}}$ $I^G(J^{PC})$ = $0^+(0 or 2^{+ +})$

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.
 ${{\mathit X}{(3915)}}$ MASS $3918.4 \pm1.9$ MeV
 ${{\mathit X}{(3915)}}$ WIDTH $20 \pm5$ MeV (S = 1.1)