Abstract An invariant differential cross section measure-ment of inclusive π0 and η meson production at mid-rapidity in pp collisions at √s = 8 TeV was carried out by the ALICE experiment at the LHC. The spectra of π0 and η mesons were measured in transverse momentum ranges of 0.3 < p T < 35 GeV/c and 0.5 < p T < 35 GeV/c, respectively. Next-to-leading order perturbative QCD cal-culations using fragmentation functions DSS14 for the π0 and AESSS for the η overestimate the cross sections of both neutral mesons, although such calculations agree with the measured η/π0 ratio within uncertainties. The results were also compared with PYTHIA 8.2 predictions for which the Monash 2013 tune yields the best agreement with the mea-sured neutral meson spectra. The measurements conﬁrm a universal behavior of the η/π0 ratio seen fo NA27, PHENIX and ALICE data for pp collisions from sqrt(s) = 27.5GeV to sqrt(s) = 8 TeV within experimental uncertainties. A relation between the π0 and η production cross sections for pp collisions at √s = 8 TeV is given by m T scaling for p T > 3.5 GeV/c. However, a deviation from this empir-ical scaling rule is observed for transverse momenta below p T < 3.5 GeV/c in the η/π0 ratio with a signiﬁcance of 6.2σ .
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|Titolo:||π0 and η meson production in proton-proton collisions at √s=8 TeV|
|Data di pubblicazione:||2018|
|Appare nelle tipologie:||1.1 Articolo in rivista|