Physical Review Letters
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Evidence of Spin-Interference Effects in Exclusive $J/ψ→{e}^{+}{e}^{−}$ Photoproduction in Ultraperipheral Heavy-Ion Collisions
Author(s): B. E. Aboona et al. (STAR Collaboration)
We report the first evidence of spin interference in exclusive $J/ψ→{e}^{+}{e}^{−}$ photoproduction in ultraperipheral heavy-ion collisions at STAR at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. In $\mathrm{Au}+\mathrm{Au}$ collisions, a negative $\mathrm{cos}(2ϕ)$ modulation is found for ${p… [Phys. Rev. Lett. 136, 242302] Published Wed Jun 17, 2026
