Observation of the \( {\mathrm{J}/\psi} \to\mu^{+}\mu^{-}\mu^{+}\mu^{-} \) decay in proton-proton collisions at \( \sqrt{s} = \) 13 TeV. Physical Review D. June 6, 2024.
Observation of the \( {\mathrm{J}/\psi} \to\mu^{+}\mu^{-}\mu^{+}\mu^{-} \) decay in proton-proton collisions at \( \sqrt{s} = \) 13 TeV. Physical Review D. June 6, 2024.