Abstract

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 corresponding to an integrated luminosity of $711\,{\rm fb}^{-1}$ and containing $772 \times 10^6 B\bar{B}$ pairs, collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider running at the $\Upsilon(4S)$ resonance energy. 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.

Highlights

  • We report the results of a search for the decay B0 → Xð3872Þð→ J=ψπþπ−Þγ

  • The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb−1 and containing 772 × 106BBpairs, collected with the Belle detector at the KEKB asymmetric-energy eþe− collider running at the Υð4SÞ resonance energy

  • Our measurement is based on a data sample corresponding to an integrated luminosity of 711 fb−1 that contains 772 × 106BBpairs, collected with the Belle detector at the KEKB asymmetric-energy eþe− (3.5 on 8 GeV) collider [9] running at the Υð4SÞ resonance

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Summary

Introduction

We report the results of a search for the decay B0 → Xð3872Þð→ J=ψπþπ−Þγ. The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb−1 and containing 772 × 106BBpairs, collected with the Belle detector at the KEKB asymmetric-energy eþe− collider running at the Υð4SÞ resonance energy. The multiplicity per event is 1.080 for the dimuon channel and 1.116 for the dielectron channel in signal MC samples.

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