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

Acharya, S.; Acosta, F. T.; Adamová, Dagmar; Bielčík, J.; Bielčíková, Jana; Broz, M.; Contreras, J. G.; Horák, D.; Křížek, Filip; Kučera, Vít; Kushpil, Svetlana; Lavička, R.; Mareš, Jiří A.; Petráček, V.; Šumbera, Michal; Vaňát, Tomáš; Závada, Petr

doi:https://dx.doi.org/10.1103/PhysRevC.98.044901

Number of the records: 1

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

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SYSNO ASEP	0495732
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at root S-NN=2.76 TeV
Author(s)	Acharya, S. (IN) Acosta, F. T. (US) Adamová, Dagmar (UJF-V)_{RID, ORCID, SAI} Bielčík, J. (CZ) Bielčíková, Jana (UJF-V)_{RID, ORCID, SAI} Broz, M. (CZ) Contreras, J. G. (CZ) Horák, D. (CZ) Křížek, Filip (UJF-V)_{RID, ORCID, SAI} Kučera, Vít (UJF-V)_RID Kushpil, Svetlana (UJF-V)_{RID, ORCID, SAI} Lavička, R. (CZ) Mareš, Jiří A. (FZU-D)_{RID, ORCID} Petráček, V. (CZ) Šumbera, Michal (UJF-V)_{RID, ORCID, SAI} Vaňát, Tomáš (UJF-V)_{ORCID, SAI} Závada, Petr (FZU-D)_{RID, ORCID}
Number of authors	1022
Article number	044901
Source Title	Physical Review C. - : American Physical Society - ISSN 2469-9985 Roč. 98, č. 4 (2018)
Number of pages	20 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	ALICE collaboration ; heavy ion collisions ; charged particle production
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
OECD category	Nuclear physics
Subject RIV - cooperation	Institute of Physics - Elementary Particles and High Energy Physics
R&D Projects	LTT17018 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Institutional support	FZU-D - RVO:68378271 ; UJF-V - RVO:61389005
UT WOS	000446402100002
EID SCOPUS	85051225663
DOI	10.1103/PhysRevC.98.044901
Annotation	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.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2019

Number of the records: 1