Search for an Axion-Like Particle in $B\to K^{(\ast )}a(\to \gamma \gamma )$ Decays at Belle

Belle, Belle II Collaborations, : +422

We report a search for an axion-like particle $a$ in $B\to K^{(\ast )}a(\to \gamma \gamma )$ decays using data collected with the Belle detector at the KEKB asymmetric energy elec…