Constraining the Low-$p_T$ $\eta /{\pi }^0$ Ratio for Direct-Photon Analyses with Blast-Wave Fits to $\pi$, $K$, and $p$ Spectra

Klaus Reygers, Andreas Kirchner, Aleksas Mazeliauskas

We predict the $\eta /{\pi }^0$ ratio at low $p_T$ ($p_T\lesssim 3\mathrm{GeV}/c$) using the measured charged $K/\pi$ ratio and model input from a blast-wave framework with feeddown contrib…