(left) The measured $\eta/\pi^{0}$ ratio for pp collisions at $\sqrt{s}=8$~TeV is shown together with theory predictions, using a linear scale on x-axis. (right) The plot shows the ratio of the measured $\eta/\pi^0$ ratio over the $\eta/\pi^0$ ratio obtained with $m_{\rm T}$ scaling. Below $3.5~\ensuremath{\mbox{GeV}/c}$, the disagreement from $m_{\rm T}$ scaling hypothesis is found to be $6.2\sigma$. | |