Measurement of the phase between strong and electromagnetic amplitudes in the decay J/ψ → ϕη. - Ablikim, M.; Achasov, M. N.; Adlarson, P.; Afedulidis, O.; Ai, X. C.; Aliberti, R.; Amoroso, A.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H.-R.; et al. (Journal of High Energy Physics, 2025)