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    Rescattering effects on spin-interference for ρ0 photoproduction in heavy-ion collisions

    Yusong Wang, Xinbai Li, Ziyang Li, Zebo Tang*, Xin Wu, and Wangmei Zha†

    • *Contact author: zbtang@ustc.edu.cn
    • †Contact author: first@ustc.edu.cn

    Phys. Rev. C 112, 034910 – Published 22 September, 2025

    DOI: https://doi.org/10.1103/ff6y-688v

    Abstract

    Recent measurements by various experiments in ultraperipheral collisions have observed spin-interference in ρ0 photoproduction, marking a breakthrough in Fermi-scale quantum interference experiments. Building on this, the STAR Collaboration extended the measurement to hadronic heavy-ion collisions, where significant rescattering effects on ρ0 mesons were expected. In this study, we investigate how these rescattering effects influence the measurement of spin-interference. By embedding ρ0 mesons produced via photoproduction, modeled by the vector-meson dominance model, into the ultrarelativistic quantum molecular dynamics framework, we estimate the impact on the cos2ϕ and cos4ϕ modulations, where ϕ is the angle between ρ0 and one of the daughters' (π±) transverse momenta. The results indicate a significant suppression of the cos2ϕ modulation, while the cos4ϕ modulation remains largely unaffected, which provides insight for understanding the difference due to rescattering effects between experimental measurements and theoretical predictions for ρ0 photoproduction in heavy-ion collisions.

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