Search for Rare $b \to d\ell^+\ell^-$ Transitions at Belle
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: Vahsen, S. E.
name: van Tonder, R.
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name: Vinokurova, A.
name: Vismaya, V. S.
name: Vitale, L.
name: Vobbilisetti, V.
name: Volpe, R.
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name: Wallner, S.
name: Wang, E.
name: Wang, M. -Z.
name: Wang, X. L.
name: Wang, Z.
name: Warburton, A.
name: Watanabe, M.
name: Watanuki, S.
name: Wessel, C.
name: Won, E.
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: Yoshihara, K.
name: Yuan, C. Z.
name: Zani, L.
name: Zeng, F.
name: Zhang, B.
name: Zhang, Y.
name: Zhilich, V.
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 present the results of a search for the $b \to d\ell^+\ell^-$ flavor-changing neutral-current rare decays $B^{+, 0} \to (η, ω, π^{+,0}, ρ^{+, 0}) e^+e^-$ and $B^{+, 0} \to (η, ω, π^{0}, ρ^{+}) μ^+μ^-$ using a $711$ fb$^{-1}$ data sample that contains $772 \times 10^{6}$ $B\overline{B}$ events. The data were collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We find no evidence for signal and set upper limits on branching fractions at the $90\%$ confidence level in the range $(3.8 - 47) \times 10^{-8}$ depending on the decay channel. The obtained limits are the world's best results. This is the first search for the channels $B^{+, 0} \to (ω, ρ^{+,0}) e^+e^-$ and $B^{+, 0} \to (ω, ρ^{+})μ^+μ^-$.
description: 7 pages, 12 figures