English

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

Nuclear Theory 2025-09-24 v2 High Energy Physics - Experiment Nuclear Experiment

Abstract

Recent measurements by various experiments in ultra-peripheral collisions have observed spin-interference in ρ0\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 ρ0\rho^{0} mesons were expected. In this study, we investigate how these rescattering effects influence the measurement of spin-interference. By embedding ρ0\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 cos2ϕ\cos2\phi and cos4ϕ\cos4\phi modulations, where ϕ\phi is the angle between ρ0\rho^{0} and one of the daughters' (π±\pi^{\pm}) transverse momentum. The results indicate a significant suppression of the cos2ϕ\cos2\phi modulation, while the cos4ϕ\cos4\phi modulation remains largely unaffected, which provides insight for understanding the difference due to rescattering effects between experimental measurements and theoretical predictions for ρ0\rho^{0} photoproduction in heavy-ion collisions.

Keywords

Cite

@article{arxiv.2502.19065,
  title  = {Rescattering effects on spin-interference for $\rho^{0}$ photoproduction in heavy-ion collisions},
  author = {Yusong Wang and Xinbai Li and Ziyang Li and Zebo Tang and Xin Wu and Wangmei Zha},
  journal= {arXiv preprint arXiv:2502.19065},
  year   = {2025}
}

Comments

9 pages, 11 figures