- Letter
- Open Access
Search for a long-lived spin-0 mediator in transitions at the Belle II experiment
Phys. Rev. D 108, L111104 – Published 21 December, 2023
DOI: https://doi.org/10.1103/PhysRevD.108.L111104
Abstract
Additional spin-0 particles appear in many extensions of the standard model. We search for long-lived spin-0 particles in -meson decays mediated by a quark transition in collisions at the resonance at the Belle II experiment. Based on a sample corresponding to an integrated luminosity of , we observe no evidence for signal. We set model-independent upper limits on the product of branching fractions and , where indicates , or , as functions of mass and lifetime at the level of .
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