pi(0) and eta meson production in proton-proton collisions at root s=8 TeV
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M. B. and Zinovjev, G. and Zmeskal, J. and Zou, S. and ALICE
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Abstract
An invariant differential cross section measurement of inclusive pi(0)
and eta meson production atmid-rapidity in pp collisions at root s = 8
TeV was carried out by the ALICE experiment at the LHC. The spectra of
pi(0) and eta 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 calculations using fragmentation
functions DSS14 for the pi(0) and AESSS for the. overestimate the cross
sections of both neutral mesons, although such calculations agree with
the measured eta/pi(0) 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 measured neutral meson spectra. The
measurements confirm a universal behavior of the eta/pi(0) ratio seen
forNA27, PHENIX and ALICE data for pp collisions from root s = 27.5 GeV
to root s = 8 TeV within experimental uncertainties. A relation between
the pi(0) and eta production cross sections for pp collisions at root s
= 8 TeV is given by m(T) scaling for p(T) > 3.5 GeV/c. However, a
deviation from this empirical scaling rule is observed for transverse
momenta below p(T) < 3.5 GeV/c in the eta/pi(0) ratio with a
significance of 6.2 sigma.... Show more Show less