Energy dependence of light neutral meson $p_{\mathrm{T}}$ spectrum produced in pp collisions at the LHC measured in ALICE

Abstract

We present 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 the LHC. The ${\pi }^0$ and $\eta$ mesons are measured via photons reconstructed by the electromagnetic calorimeters and the central tracking system. The invariant cross-section of ${\pi }^0$ and $\eta$ mesons are measured in a broad $p_{\mathrm{T}}$ range at $\sqrt{s}=0.9,2.76,7,5.02$ and 8 TeV. The spectra of ${\pi }^0$ and $\eta$ mesons measured in pp collisions at different collision energies show $x_{\mathrm{T}}$-scaling at high $p_{\mathrm{T}}$ and violation of $m_{\mathrm{T}}$-scaling at low $p_{\mathrm{T}}$. The smaller $x_{\mathrm{T}}$-scaling exponents of our measurements compared to RHIC may hint at a reduced importance of higher twist processes at LHC.

5 pages, 2 figures, Proceedings of The Eighth Annual Conference on Large Hadron Collider Physics (LHCP2020), 25-30 May, 2020