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In this work, the branching ratio $\mathcal{B}[B\to K\chi_{c0}(2P)]$ isextracted for the first time through the fit fractions in the newly measured$B\to KD\bar{D}$ process by LHCb. With the rescattering mechanism, thisextracted branching ratio is reproduced well. Our study further enforces therole of the newly measured $B\to KD\bar{D}$ process to establish the$\chi_{c0}(2P)$ charmonium state, which is a crucial step when constructingcharmonium family.

Role of the newly measured $B\to KD\bar{D}$ process to establish $\chi_{c0}(2P)$ state