Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at root S-NN=2.76 TeV

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The ALICE Collaboration , Acharya , S , Brücken , E J , Chang , B , Kim , D J , Litichevskyi , V , Mieskolainen , M M , Orava , R , Rak , J , Räsänen , S S , Saarinen , S , Slupecki , M , Snellman , T W , Trzaska , W H , Vargyas , M & Viinikainen , J 2018 , ' Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at root S-NN=2.76 TeV ' , Physical Review C , vol. 98 , no. 4 , 044901 . https://doi.org/10.1103/PhysRevC.98.044901

Title: Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at root S-NN=2.76 TeV
Author: The ALICE collaboration; Acharya, S.; Brücken, E. J.; Chang, B.; Kim, D. J.; Litichevskyi, V.; Mieskolainen, M. M.; Orava, R.; Rak, J.; Räsänen, S. S.; Saarinen, S.; Slupecki, M.; Snellman, T. W.; Trzaska, W. H.; Vargyas, M.; Viinikainen, J.
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
Date: 2018-10-04
Language: eng
Number of pages: 20
Belongs to series: Physical Review C
ISSN: 2469-9985
URI: http://hdl.handle.net/10138/253501
Abstract: Neutral pion and eta 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 root 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 pi(0) measurements from 12 to 20 GeV/c and present the first measurement of eta meson production in heavy-ion collisions at the LHC. The eta/pi(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 pi(0) and eta meson production is observed in Pb-Pb collisions with respect to their production in pp 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 pi(0) results while for the eta some tension is observed.
Subject: 114 Physical sciences
CHARGED-PARTICLE PRODUCTION
ENERGY NUCLEAR COLLISIONS
LARGE TRANSVERSE-MOMENTUM
HEAVY-ION COLLISIONS
ROOT-S(NN)=2.76 TEV
FRAGMENTATION FUNCTIONS
JET TOMOGRAPHY
DENSE MATTER
FREEZE-OUT
LHC
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