Fig. 3.

Transverse momentum spectra for ${\mathit{\eta }}_c(1S)$ mesons (red filled circles). The $p_{\mathrm{T}}$ spectra of $J/\mathit{\psi }$ from Refs. [1–3] are shown for comparison as blue open circles. Prompt production spectra are shown on a and c for data collected at $\sqrt{s}=7\mathrm{TeV}$ and $\sqrt{s}=8\mathrm{TeV}$, respectively. The spectra from inclusive charmonium production in $b$-hadron decays are shown on b and d for data collected at $\sqrt{s}=7\mathrm{TeV}$ and $\sqrt{s}=8\mathrm{TeV}$, respectively