First measurement of inclusive $\psi(2S)$-to-$J/\psi$ cross-section ratio in $\;p\mathrm{Ar}\;$ and $\;pp\;$ collisions at $\;\sqrt{s_{\mathrm{NN}}} =113\,\mathrm{GeV}\;$ with SMOG2
R. Aaij, M. Abdelfatah, A.S.W. Abdelmotteleb, C. Abellan Beteta et autres
A measurement of the $\psi(2S)$-to-$J/\psi$ production cross-section ratio is performed in proton-argon ($p\mathrm{Ar}$) and proton-proton ($pp$) collisions in fixed-target mode at \$\sqrt{s_{\mathrm{NN}}}=113\,\mathrm{GeV}$. Data samples were collected by the LHCb experiment during argon and hydrogen gas injections in the SMOG2 storage cell, resulting …
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