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We report a search for $X(3872)$ and $X(3915)$ in $B^+ \to \chi_{c1} \pi^0K^+$ decays. We set an upper limit of $\mathcal{B}(B^+ \to X(3872) K^+) \times\mathcal{B}(X(3872) \to \chi_{c1} \pi^0)$ $ < 8.1 \times 10^{-6}$ and$\mathcal{B}(B^+ \to X(3915) K^+) \times \mathcal{B}(X(3915) \to \chi_{c1}\pi^0)$ $ < 3.8 \times 10^{-5}$ at 90\% confidence level. We also measure$\mathcal{B}(X(3872) \to \chi_{c1} \pi^0)/\mathcal{B}(X(3872) \to J/\psi \pi^+\pi^-) < 0.97$ at 90\% confidence level. The results reported here are obtainedfrom $772 \times 10^{6}$ $B\overline{B}$ events collected at the $\Upsilon(4S)$resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$collider.

Search for $X(3872)$ and $X(3915)$ decay into $\chi_{c1} \pi^0$ in $B$ decays at Belle