Neutral pion and $\eta$ meson production in proton-proton collisions at $\sqrt{s}=0.9$ TeV and $\sqrt{s}=7$ TeV

Abstract

The first measurements of the invariant differential cross sections of inclusive ${\pi }^0$ and $\eta$ meson production at mid-rapidity in proton-proton collisions at $\sqrt{s}=0.9$ TeV and $\sqrt{s}=7$ TeV are reported. The ${\pi }^0$ measurement covers the ranges $0.4<p_T<7$ GeV/$c$ and $0.3<p_T<25$ GeV/$c$ for these two energies, respectively. The production of $\eta$ mesons was measured at $\sqrt{s}=7$ TeV in the range $0.4<p_T<15$ GeV/$c$. Next-to-Leading Order perturbative QCD calculations, which are consistent with the ${\pi }^0$ spectrum at $\sqrt{s}=0.9$ TeV, overestimate those of ${\pi }^0$ and $\eta$ mesons at $\sqrt{s}=7$ TeV, but agree with the measured $\eta /{\pi }^0$ ratio at $\sqrt{s}=7$ TeV.

17 pages, 5 captioned figures, 2 tables, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3103

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