Resonant ALP-Portal Dark Matter Annihilation as a Solution to the $B^{\pm }\to K^{\pm }\nu \bar{\nu }$ Excess

Kewen Ding, Ying Li, Xuewen Liu +3

The Belle II collaboration recently reported a $2.7\sigma$ excess in the rare decay $B^{\pm }\to K^{\pm }\nu \bar{\nu }$, potentially signaling new physics. We propose an axion-like particle (ALP)-…