https://doi.org/10.1140/epjc/s10052-024-12936-x
Letter
The first limit on invisible decays of
mesons comes from LEP
1
Department of Physics, McGill University, 3600 Rue University, H3A 2T8, Montréal, QC, Canada
2
Department of Physics, University of Toronto, M5S 1A7, Toronto, ON, Canada
3
Theoretical Physics Department, CERN, 1211, Geneva 23, Switzerland
Received:
13
February
2024
Accepted:
21
May
2024
Published online:
31
May
2024
Motivated by the recent evidence for decays at Belle II, we point out that fully invisible
and
meson decays are strongly constrained by LEP. A reinterpretation of an old inclusive ALEPH search for b-hadron decays with large missing energy allows us to place the limits
and
, both at
CL. The
limit is only a factor of 6 looser than the world-leading one provided by the BaBar collaboration, while the
one is the first limit in the literature on this decay mode. These results are relevant in the context of new light states coupled to quarks and exemplify the power of a future Tera-Z factory at FCC-ee to look for B meson decays containing missing energy.
© The Author(s) 2024
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