Rescattering effects on spin-interference for ${\rho }^0$ photoproduction in heavy-ion collisions

Abstract

Recent measurements by various experiments in ultra-peripheral collisions have observed spin-interference in ${\rho }^0$ photoproduction, marking a breakthrough in Fermi-scale quantum interference experiments. Building on this, STAR extended the measurement to hadronic heavy-ion collisions, where significant rescattering effects on ${\rho }^0$ mesons were expected. In this study, we investigate how these rescattering effects influence the measurement of spin-interference. By embedding ${\rho }^0$ mesons produced via photoproduction, modeled by the Vector Meson Dominance model, into the Ultrarelativistic Quantum Molecular Dynamics framework, we estimate the impact on the $\cos 2\varphi$ and $\cos 4\varphi$ modulations, where $\varphi$ is the angle between ${\rho }^0$ and one of the daughters' (${\pi }^{\pm }$) transverse momentum. The results indicate a significant suppression of the $\cos 2\varphi$ modulation, while the $\cos 4\varphi$ modulation remains largely unaffected, which provides insight for understanding the difference due to rescattering effects between experimental measurements and theoretical predictions for ${\rho }^0$ photoproduction in heavy-ion collisions.

arXiv comment9 pages, 11 figures

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