Unparticle effects on Dark Matter production from photon and axion-like

In this work, we study the effects of vector unparticle on the \(aγ → χ χ̄\) process, where \(χ\) is a dark matter fermion. Our numerical results show that the cross-section takes values from \(8.23 × 10⁻¹⁵\,barn\) to \(5.12 × 10⁻¹⁴\,barn\). Consequently, the cross-section with unparticle effect should be about \(10²⁶--10²⁸\) times larger that obtained via pure photon exchange. This enhancement could be important for searching for dark matter, as well as unparticle.