Search for the decay $B^{0}\toγγ$ using Belle and Belle II data
Creators: name: Belle
name: Collaborations, Belle II
name: :
name: Adachi, I.
name: Aggarwal, L.
name: Aihara, H.
name: Akopov, N.
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name: Jiménez, I. Domínguez
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name: Vahsen, S. E.
name: van Tonder, R.
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name: Vismaya, V. S.
name: Vitale, L.
name: Vobbilisetti, V.
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name: Vossen, A.
name: Wach, B.
name: Wakai, M.
name: Wallner, S.
name: Wang, E.
name: Wang, M. -Z.
name: Wang, X. L.
name: Wang, Z.
name: Warburton, A.
name: Watanuki, S.
name: Wessel, C.
name: Won, E.
name: Xie, Y.
name: Xu, X. P.
name: Yabsley, B. D.
name: Yamada, S.
name: Yan, W.
name: Yang, S. B.
name: Yelton, J.
name: Yin, J. H.
name: Yook, Y. M.
name: Yoshihara, K.
name: Yuan, C. Z.
name: Yusa, Y.
name: Zani, L.
name: Zeng, F.
name: Zhang, B.
name: Zhilich, V.
name: Zhou, J. S.
name: Zhou, Q. D.
name: Zhukova, V. I.
name: Žlebčík, R.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report the result of a search for the rare decay $B^{0} \to γγ$ using a combined dataset of $753\times10^{6}$ $B\bar{B}$ pairs collected by the Belle experiment and $387\times10^{6}$ $B\bar{B}$ pairs collected by the Belle II experiment from decays of the $\rm Υ(4S)$ resonance produced in $e^{+}e^{-}$ collisions. A simultaneous fit to the Belle and Belle II data sets yields $11.0^{+6.5}_{-5.5}$ signal events, corresponding to a 2.5$σ$ significance. We determine the branching fraction $\mathcal{B}(B^{0} \to γγ) = (3.7^{+2.2}_{-1.8}(\rm stat)\pm0.5(\rm syst))\times10^{-8}$ and set a 90% credibility level upper limit of $\mathcal{B}(B^{0} \to γγ) &lt; 6.4\times10^{-8}$.
description: Published in PRD(L)