Neutral pion and η meson production at midrapidity in Pb-Pb collisions at √sNN = 2.76 TeV
ALICE Collaboration. (2018). Neutral pion and η meson production at midrapidity in Pb-Pb collisions at √sNN = 2.76 TeV. Physical Review C, 98(4), Article 044901. https://doi.org/10.1103/PhysRevC.98.044901
Published in
Physical Review CAuthors
Date
2018Copyright
© 2018 CERN, for the ALICE Collaboration
Neutral pion and
η
meson production in the transverse momentum range 1
<
p
T
<
20
GeV
/
c
have been measured at midrapidity by the ALICE experiment at the Large Hadron Collider (LHC) in central and semicentral Pb-Pb collisions at
√
s
NN
= 2.76 TeV. These results were obtained using the photon conversion method as well as the Photon Spectrometer (PHOS) and Electromagnetic Calorimeter detectors. The results extend the upper
p
T
reach of the previous ALICE
π
0
measurements from 12 to 20
GeV
/
c
and present the first measurement of
η
meson production in heavy-ion collisions at the LHC. The
η
/
π
0
ratio is similar for the two centralities and reaches at high
p
T
a plateau value of 0.457
±
0
.
013
stat
±
0
.
018
syst
. A suppression of similar magnitude for
π
0
and
η
meson production is observed in Pb-Pb collisions with respect to their production in
p
p
collisions scaled by the number of binary nucleon-nucleon collisions. We discuss the results in terms of Next to Leading Order (NLO) pQCD predictions and hydrodynamic models. The measurements show a stronger suppression than observed at lower center-of-mass energies in the
p
T
range 6
<
p
T
<
10
GeV
/
c
. For
p
T
<
3
GeV
/
c
, hadronization models describe the
π
0
results while for the
η
some tension is observed.
...


Publisher
American Physical SocietyISSN Search the Publication Forum
2469-9985Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/28696540
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