Abstract
We present a search for a non-Standard-Model invisible particle in the mass range in and decays. The results are obtained from a data sample that corresponds to pairs, collected at the resonance with the Belle detector at the KEKB collider. One 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 meson. We find no evidence of a signal and set upper limits on the order of .
- Received 17 May 2016
DOI:https://doi.org/10.1103/PhysRevD.94.012003
© 2016 American Physical Society