Search for a massive invisible particle X0 in B+e+X0 and B+μ+X0 decays

C.-S. Park et al. (Belle Collaboration)
Phys. Rev. D 94, 012003 – Published 18 July 2016

Abstract

We present a search for a non-Standard-Model invisible particle X0 in the mass range 0.11.8GeV/c2 in B+e+X0 and B+μ+X0 decays. The results are obtained from a 711fb1 data sample that corresponds to 772×106BB¯ pairs, collected at the ϒ(4S) resonance with the Belle detector at the KEKB e+e collider. One B meson is fully reconstructed in a hadronic mode to determine the momentum of the lepton of the signal decay in the rest frame of the recoiling partner B meson. We find no evidence of a signal and set upper limits on the order of 106.

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  • Received 17 May 2016

DOI:https://doi.org/10.1103/PhysRevD.94.012003

© 2016 American Physical Society

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Particles & Fields

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Vol. 94, Iss. 1 — 1 July 2016

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