Search for Axion(-like) Particles in Heavy-Ion Collisions

The axion(-like) particles are the perfect candidates for solving the strong $CP$ problem in Quantum Chromodynamics and the dark matter puzzle in our Universe. One of the possible ways to search for axion(-like) particles is using the conversion of photon to axion(-like) particles and the conversion probability is proportional to the square of the product of the coupling constant $g$, strength of magnetic field $B$, and the traveling distance $L$. The current experiments for the search of axion(-like) particles are limited by the product of $B$ and $L$, which is in the order of 10 $T\cdot m$. In this letter, we propose using the direct photon production in heavy-ion collisions to search for axion(-like) particles. This configuration could have the $BL$ factor up to 100 $T\cdot m$ and the expected upper limits can cover a new phase space of the production of the axion(-like) particles.