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We report the results of a search for the decay $B^0 \to X(3872)(\to J/\psi\pi^+ \pi^-) \gamma$. The analysis is performed on a data sample correspondingto an integrated luminosity of $711\,{\rm fb}^{-1}$ and containing $772 \times10^6 B\bar{B}$ pairs, collected with the Belle detector at the KEKBasymmetric-energy $e^+ e^-$ collider running at the $\Upsilon(4S)$ resonanceenergy. We find no evidence for a signal and place an upper limit of$\mathcal{B}(B^0 \to X(3872)\gamma)\times \mathcal{B}(X(3872) \to J/\psi \pi^+\pi^-) < 5.1 \times 10^{-7}$ at 90% confidence level.

Search for $B^0 \to X(3872) \gamma$