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Considering the coupling of color $1 \otimes 1$ and $8 \otimes 8$ structures,we calculate the energy of the newly observed $X$(3915) as $S-$wave$D^*\bar{D^*}$ state in the Bhaduri, Cohler, and Nogami quark model by theGaussian Expansion Method. Due to the color coupling, the bound state of$D^*\bar{D^*}$ with $J^{PC}=0^{++}$ is found, which is well consonant with theexperimental data of the $X$(3915). The bound state of $B^*\bar{B^*}$ with$J^{PC}=0^{++}$ and $2^{++}$ are also predicted in this work.

Dynamical study of the $X$(3915) as a molecular $D^*\bar{D^*}$ state in a quark model

Dynamical study of the $X$(3915) as a molecular $D^\bar{D^}$ state in a quark model