Figure 3

a) Differential invariant cross section of $\pi^0$ production in pp collisions at $\sqrt{s}=7$ TeV (circles) and 0.9 TeV (squares) and of $\eta$ meson production at $\sqrt{s}=7$ TeV (stars). The lines and the boxes represent the statistical and systematic error of the combined measurement respectively. The uncertainty on the pp cross section is not included NLO pQCD calculations using the CTEQ6M5 PDF and the DSS (AESS for $\eta$ mesons) FF for three scales $\mu=0.5\pT$, $1\pT$ and $2\pT$ are shown. Dotted lines in panels b) and c) correspond to the ratios using the BKK FF. Ratio of the NLO calculations to the data parametrisations are shown in panels b), c) and d). The full boxes represent the uncertainty on the pp cross sections.