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Measurement of the $\eta_c (1S)$ production cross-section in proton-proton collisions via the decay $\eta_c (1S) \rightarrow p \bar{p}$

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Academic year: 2021

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Figure 1: Proton-antiproton invariant mass spectrum for candidates originating from a secondary vertex and reconstructed in √
Figure 2: Proton-antiproton invariant mass spectrum for candidates originating from a primary vertex (upper panel in each plot), and distribution of differences between data and the background distribution resulting from the fit (lower panel in each plot),
Table 1: Summary of uncertainties for the yield ratio N η c (1S) /N J/ψ .
Figure 3: Transverse momentum spectra for η c (1S) mesons (red filled circles). The p T spectra of J/ψ from Refs

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