Speaker
Description
We present in this poster the measurement of light neutral mesons, $\pi^{0}$ and $\eta$, in pp collisions at different center-of-mass energies obtained with the ALICE experiment at CERN. In pp collisions, neutral mesons are used to validate the pQCD predictions and also act as a baseline for their measurement in heavy-ion collisions. Neutral mesons have been reconstructed by invariant mass analysis of two decay photons using ALICE calorimeters EMCal and PHOS, in the transverse momentum range 0.8 $< p_{\rm T} <$ 40 GeV$/c$. In addition, neutral mesons via conversion photons method are measured up to very low $p_{\rm T}$ ($\sim$ 0.35 GeV$/c$) using the central tracking system in ALICE.
Results from different techniques are combined to provide precision measurements of $\pi^{0}$ and $\eta$ in pp collisions over much wider $p_{\rm T}$ range than any other identified hadrons $p_{\rm T}$ spectra which are used for tuning QCD parameters.
We will show the invariant cross-sections, $m_{\rm T}$-scaling and $x_{\rm T}$-scaling for $\pi^{0}$ and $\eta$.
