First measurement of the ratio of $ψ(2S)$-to-$J/ψ$ inclusive production in $p\mathrm{Ar}$ and $pp$ collisions at $\sqrt{s_{\mathrm{NN}}} =113\,\mathrm{GeV}$ with SMOG2
LHCb collaboration, R. Aaij, M. Abdelfatah, A. S. W. Abdelmotteleb et autres
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arXiv (Cornell University)