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

S. Acharya; F Acosta; D. Adamova; J Adolfsson; MM. Aggarwal; G.A. Rinella; Maria Agnello; N. Agrawal; Z. Ahammed; S.U. Ahn; S. Aiola; A. Akindinov; M. Al-Turany; SN Alam; DSD Albuquerque; D. Aleksandrov; B Alessandro; Rafael A. Molina; A. Alici; A. Alkin; J. Alme; T. Alt; Ian Bearden; Ante Bilandzic; Christian Alexander Bourjau; Marek Chojnacki; Katarina Gajdosova; Jens Jørgen Gaardhøje; bsm989 bsm989; Freja Thoresen; Christian Holm Christensen; You Zhou; Lais Ozelin De Lima Pimentel; Børge Svane Nielsen

doi:10.1103/PhysRevC.98.044901

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

S. Acharya, F Acosta, D. Adamova, J Adolfsson, MM. Aggarwal, G.A. Rinella, Maria Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, S. Aiola, A. Akindinov, M. Al-Turany, SN Alam, DSD Albuquerque, D. Aleksandrov, B Alessandro, Rafael A. Molina, A. Alici, A. AlkinJ. Alme, T. Alt, Ian Bearden, Ante Bilandzic, Christian Alexander Bourjau, Marek Chojnacki, Katarina Gajdosova, Jens Jørgen Gaardhøje, bsm989 bsm989, Freja Thoresen, Christian Holm Christensen, You Zhou, Lais Ozelin De Lima Pimentel, Børge Svane Nielsen

Experimental Particle Physics

11 Citations (Scopus)

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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
Article number	044901
Journal	Physical Review C
Volume	98
Issue number	4
Number of pages	20
ISSN	2469-9985
DOIs	https://doi.org/10.1103/PhysRevC.98.044901
Publication status	Published - 4 Oct 2018

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PhysRevC.98.044901Final published version, 1.2 MBLicence: CC BY

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Acharya, S., Acosta, F., Adamova, D., Adolfsson, J., Aggarwal, MM., Rinella, G. A., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, SN., Albuquerque, DSD., Aleksandrov, D., Alessandro, B., Molina, R. A., Alici, A., ... Nielsen, B. S. (2018). Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at root S-NN=2.76 TeV. Physical Review C, 98(4), [044901]. https://doi.org/10.1103/PhysRevC.98.044901

Acharya, S, Acosta, F, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, GA, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aiola, S, Akindinov, A, Al-Turany, M, Alam, SN, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Molina, RA, Alici, A, Alkin, A, Alme, J, Alt, T, Bearden, I, Bilandzic, A, Bourjau, CA, Chojnacki, M, Gajdosova, K, Gaardhøje, JJ , bsm989, B, Thoresen, F, Christensen, CH , Zhou, Y, Ozelin De Lima Pimentel, L & Nielsen, BS 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

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

abstract = "Neutral pion and η meson production in the transverse momentum range 1 ",

author = "S. Acharya and F Acosta and D. Adamova and J Adolfsson and MM. Aggarwal and G.A. Rinella and Maria Agnello and N. Agrawal and Z. Ahammed and S.U. Ahn and S. Aiola and A. Akindinov and M. Al-Turany and SN Alam and DSD Albuquerque and D. Aleksandrov and B Alessandro and Molina, {Rafael A.} and A. Alici and A. Alkin and J. Alme and T. Alt and Ian Bearden and Ante Bilandzic and Bourjau, {Christian Alexander} and Marek Chojnacki and Katarina Gajdosova and Gaardh{\o}je, {Jens J{\o}rgen} and bsm989 bsm989 and Freja Thoresen and Christensen, {Christian Holm} and You Zhou and {Ozelin De Lima Pimentel}, Lais and Nielsen, {B{\o}rge Svane}",

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doi = "10.1103/PhysRevC.98.044901",

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T1 - Neutral pion and eta meson production at midrapidity in Pb-Pb collisions at root S-NN=2.76 TeV

AU - Acharya, S.

AU - Acosta, F

AU - Adamova, D.

AU - Adolfsson, J

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S.U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, SN

AU - Albuquerque, DSD

AU - Aleksandrov, D.

AU - Alessandro, B

AU - Molina, Rafael A.

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Bearden, Ian

AU - Bilandzic, Ante

AU - Bourjau, Christian Alexander

AU - Chojnacki, Marek

AU - Gajdosova, Katarina

AU - Gaardhøje, Jens Jørgen

AU - bsm989, bsm989

AU - Thoresen, Freja

AU - Christensen, Christian Holm

AU - Zhou, You

AU - Ozelin De Lima Pimentel, Lais

AU - Nielsen, Børge Svane

PY - 2018/10/4

Y1 - 2018/10/4

N2 - Neutral pion and η meson production in the transverse momentum range 1

AB - Neutral pion and η meson production in the transverse momentum range 1

U2 - 10.1103/PhysRevC.98.044901

DO - 10.1103/PhysRevC.98.044901

M3 - Journal article

SN - 2469-9985

VL - 98

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 044901

ER -

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

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