Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at √sNN=2.76 TeV

ALICE Collaboration; S. Acharya; H. A. Andrews; D. Evans; K. L. Graham; P. G. Jones; A. Jusko; M. Krivda; R. Lietava; O. Villalobos Baillie; E. Willsher; N. Zardoshti

doi:10.1103/PhysRevC.98.044901

Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at √sNN=2.76 TeV

ALICE Collaboration, S. Acharya (Contributor), H. A. Andrews (Contributor), D. Evans (Contributor), K. L. Graham (Contributor), P. G. Jones (Contributor), A. Jusko (Contributor), M. Krivda (Contributor), R. Lietava (Contributor), O. Villalobos Baillie (Contributor), E. Willsher (Contributor), N. Zardoshti (Contributor)

Physics and Astronomy

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Abstract

Neutral pion and η meson production in the transverse momentum range 1 <pT< 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 √sNN = 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 pT reach of the previous ALICE π0 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/π0 ratio is similar for the two centralities and reaches at high pT a plateau value of 0.457 ± 0.013stat ± 0.018syst. A suppression of similar magnitude for π0 and η 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 pT range 6 <pT< 10 GeV/c. For pT< 3 GeV/c, hadronization models describe the π0 results while for the η some tension is observed.

Original language	English
Pages (from-to)	044901
Journal	Physical Review C
Volume	98
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.98.044901
Publication status	Published - 4 Oct 2018

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ALICE_Neutral_pion_and_n_meson_production_Physical_Review_C_2018
Checked for eligibility 31/01/2019 https://doi.org/10.1103/PhysRevC.98.044901
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@article{fcb0f93b0cbe49729ca8018152e10790,

title = "Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at √sNN=2.76 TeV",

abstract = "Neutral pion and η meson production in the transverse momentum range 1 <pT< 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 √sNN = 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 pT reach of the previous ALICE π0 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/π0 ratio is similar for the two centralities and reaches at high pT a plateau value of 0.457 ± 0.013stat ± 0.018syst. A suppression of similar magnitude for π0 and η 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 pT range 6 <pT< 10 GeV/c. For pT< 3 GeV/c, hadronization models describe the π0 results while for the η some tension is observed.",

author = "{ALICE Collaboration} and S. Acharya and Andrews, {H. A.} and D. Evans and Graham, {K. L.} and Jones, {P. G.} and A. Jusko and M. Krivda and R. Lietava and {Villalobos Baillie}, O. and E. Willsher and N. Zardoshti",

year = "2018",

month = oct,

day = "4",

doi = "10.1103/PhysRevC.98.044901",

language = "English",

volume = "98",

pages = "044901",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society (APS)",

number = "4",

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TY - JOUR

T1 - Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at √sNN=2.76 TeV

AU - ALICE Collaboration

A2 - Acharya, S.

A2 - Andrews, H. A.

A2 - Evans, D.

A2 - Graham, K. L.

A2 - Jones, P. G.

A2 - Jusko, A.

A2 - Krivda, M.

A2 - Lietava, R.

A2 - Villalobos Baillie, O.

A2 - Willsher, E.

A2 - Zardoshti, N.

PY - 2018/10/4

Y1 - 2018/10/4

N2 - Neutral pion and η meson production in the transverse momentum range 1 <pT< 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 √sNN = 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 pT reach of the previous ALICE π0 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/π0 ratio is similar for the two centralities and reaches at high pT a plateau value of 0.457 ± 0.013stat ± 0.018syst. A suppression of similar magnitude for π0 and η 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 pT range 6 <pT< 10 GeV/c. For pT< 3 GeV/c, hadronization models describe the π0 results while for the η some tension is observed.

AB - Neutral pion and η meson production in the transverse momentum range 1 <pT< 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 √sNN = 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 pT reach of the previous ALICE π0 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/π0 ratio is similar for the two centralities and reaches at high pT a plateau value of 0.457 ± 0.013stat ± 0.018syst. A suppression of similar magnitude for π0 and η 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 pT range 6 <pT< 10 GeV/c. For pT< 3 GeV/c, hadronization models describe the π0 results while for the η some tension is observed.

U2 - 10.1103/PhysRevC.98.044901

DO - 10.1103/PhysRevC.98.044901

M3 - Article

SN - 0556-2813

VL - 98

SP - 044901

JO - Physical Review C

JF - Physical Review C

IS - 4

ER -

Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at √sNN=2.76 TeV

Abstract

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