Charmonium production in $p$Ne collisions at $\sqrt{s_{\mathrm{NN}}}=68.5$ GeV

Abstract

The measurement of charmonium states produced in proton-neon ($p$Ne) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of $J/\psi$ and $\psi (2S)$ mesons is studied with a beam of 2.5 TeV protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy $\sqrt{s_{\mathrm{NN}}}=68.5$ GeV. The data sample corresponds to an integrated luminosity of $21.7\pm 1.4$ nb${}^{-1}$. The $J/\psi$ and $\psi (2S)$ hadrons are reconstructed in ${\mu }^{+}{\mu }^{-}$ final states. The $J/\psi$ production cross-section per target nucleon in the centre-of-mass rapidity range $y^{\ast }\in [-2.29,0]$ is found to be $506\pm 8\pm 25\text{ nb/nucleon}$. The $\psi (2S)$ to $J/\psi$ relative production rate is found to be $(1.67\pm 0.27\pm 0.10)\%$ in good agreement with other measurements involving beam and target nuclei of similar sizes.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-014.html (LHCb public pages)

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Cited by in corpus (5)

• Overview of high-density QCD studies with the CMS experiment at the LHC
• High-density gas target at the LHCb experiment
• $J/\psi$ and $D^0$ production in $\sqrt{s_{\mathrm{NN}}}$ = 68.5 GeV PbNe collisions
• The impact of future $D$- and $B$-meson measurements with the SMOG2 program at LHCb on the determination of nuclear parton distribution functions
• Multiplicity dependence of ${\rm Y}$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV