Search for B⁰ → X(3872)γ at Belle experiment

Pin-Chun Chou^1*, Paoti Chang¹

¹Department of Physics, National Taiwan University, Taipei, Taiwan

* Presenter:Pin-Chun Chou, email:r06244003@ntu.edu.tw

We report the results of a search for the decay B⁰ →X(3872)(→J/ψπ⁺π⁻)γ at Belle experiment. The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb⁻¹ and containing 772 × 10⁶ BB ̄ pairs, collected with the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider running at the Υ(4S) resonance energy. We find no evidence for a signal and place an upper limit of the branching fraction product B(B⁰ → X(3872)γ) × B(X(3872) → J/ψπ⁺π⁻) < 5.1 × 10⁻⁷ at 90% confidence level.

Keywords: Belle experiment, X(3872), rare B decay, B meson