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The propagation velocity of scintillation light in liquid argon $v_{g}$ at$\lambda \sim 128$~nm wavelength, has been measured for the first time in adedicated experimental setup at CERN.\\ The obtained result $\frac{1}{v_{g}} =7.46 \pm 0.08$~ns/m , is then used to derive the value of the refractive index(n) and the Rayleigh scattering length ($\mathcal{L}$) for liquid argon in theVUV region. For $\lambda = 128$~nm we found $n= 1.358 \pm 0.003$ and$\mathcal{L}= 99.1 \pm 2.3$~cm. The measured values are of interest for avariety of experiments searching for rare events like neutrino and dark matterinteractions. The derived quantities also represent key information fortheoretical models describing the propagation of scintillation light in liquidargon.

A measurement of the group velocity of scintillation light in liquid argon