Constraints on Axion-like Particles from a Hard $X$-ray Observation of Betelgeuse

Mengjiao Xiao, Kerstin M. Perez, Maurizio Giannotti +5

We use the first observation of Betelgeuse in hard $X$-rays to perform a novel search for axion-like particles (ALPs). Betelgeuse is not expected to be a standard source of $X$-ray…