Neutral pion and η meson production in p–Pb collisions at √sNN = 5.02 TeV

ALICE Collaboration

doi:10.1140/epjc/s10052-018-6013-8

Neutral pion and η meson production in p–Pb collisions at √sNN = 5.02 TeV

ALICE Collaboration

Sección de Física

CERN
Variable Energy Cyclotron Centre
Academy of Sciences of the Czech Republic
University of Lund
Panjab University
Politecnico di Torino
Indian Institute of Technology Bombay
Korea Institute of Science and Technology Information
Yale University
Alikhanov Institute for Theoretical and Experimental Physics
GSI Helmholtzzentrum für Schwerionenforschung
Universidade Estadual de Campinas
Russian Research Centre Kurchatov Institute
Sezione INFN
Universidad Nacional Autónoma de México
COMSATS University Islamabad
Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi
National Institute for Nuclear Physics
Bogolyubov Institute for Theoretical Physics Nasu
University of Bergen
Goethe University Frankfurt
St. Petersburg State University
National Institute for Physics and Nuclear Engineering
University of Birmingham
Ruprecht-Karls-Universität Heidelberg
Creighton University
Ruder Boskovic Institute
Lawrence Berkeley National Laboratory
Nantes Université
Technical University of Munich
Technische Universität München
University of Oslo
Department of Physics Aligarh Muslim University
Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN
Inha University
Konkuk University
University of Jammu
CNRS-IN2P3
Rheinische Friedrich-Wilhelms-Universität Bonn
Institute of Physics Bhubaneswar
National Institute of Science Education and Research
Hungarian Academy of Sciences
STFC Daresbury Laboratory
Centre de calcul de l'IN2P3
Central China Normal University
Wayne State University
Joint Institute for Nuclear Research
University of Copenhagen
Institute for Subatomic Physics of Utrecht University
Université de Strasbourg
Benemérita Universidad Autónoma de Puebla
University of Houston
Universidad Autonoma de Sinaloa
Moscow Engineering Physics Institute
Petersburg Nuclear Physics Institute (PNPI)
University of Tennessee
Gauhati University
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
INFN, Laboratori Nazionali Di Frascati
Faculty of Nuclear Sciences and Physical Engineering
Bose Institute
University of Texas at Austin
University of Pavia
Pavol Jozef Šafárik University
Università di Brescia
Pusan National University
University of Liverpool
Universidade de São Paulo
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Russian Federal Nuclear Center (VNIIEF)
Austrian Academy of Sciences
University of Tsukuba
National Research Foundation
Ohio State University
Technical University of Košice
National Institute for Subatomic Physics
Pontifical Catholic Univ. of Peru
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
University of Jyväskylä
Saha Institute of Nuclear Physics
Universite Claude Bernard Lyon 1
University of Cape Town
Slovak Academy of Sciences
Université Grenoble Alpes
Oak Ridge National Laboratory
Università del Piemonte Orientale and Gruppo Collegato INFN
Universidade Federal do ABC
University of Münster
Institute of Space Science (ISS)
Indian Institute of Technology Indore
Frankfurt Institute for Advanced Studies
National Centre for Nuclear Studies
University of Zagreb
Institute for High Energy Physics
RAS - Institute for Nuclear Research
National and Kapodistrian University of Athens
Chicago State University
Universidade Federal do Rio Grande do Sul
University of Split
Warsaw University of Technology
A. I. Alikhanyan National Science Laboratory (YereVan Physics Institute) Foundation
Tokyo University
Nagasaki Institute of Applied Science
Western Norway University of Applied Sciences
Centro de Investigación y de Estudios AVanzados (CINVESTAV)
Eberhard Karls Universität Tübingen
Sejong University
Yonsei University
KTO Karatay University
Zentrum für Technologietransfer und Telekommunikation (ZTT)
Jeonbuk National University
Gangneung-Wonju National University
California Polytechnic State University, San Luis Obispo
Suranaree University of Technology
University of South-Eastern Norway
China Institute of Atomic Energy
University of the Witwatersrand
Institute of Physics of the Czech Academy of Sciences
University of Rome La Sapienza
Comenius University
Hiroshima University
Budker Institute for Nuclear Physics
University of Rajasthan
National Nuclear Research Center
Nara Women's University
Indonesian Institute of Sciences

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48 Scopus citations

Abstract

Neutral pion and η meson invariant differential yields were measured in non-single diffractive p–Pb collisions at sNN = 5.02 TeV with the ALICE experiment at the CERN LHC. The analysis combines results from three complementary photon measurements, utilizing the PHOS and EMCal calorimeters and the Photon Conversion Method. The invariant differential yields of π⁰ and η meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of 0.3<pT<20GeV/c and 0.7<pT<20GeV/c, respectively. The measured η/ π⁰ ratio increases with p_T and saturates for p_T > 4 GeV / c at 0.483 ± 0. 015 _stat± 0. 015 _sys. A deviation from m_T scaling is observed for p_T< 2 GeV / c. The measured η/ π⁰ ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full p_T range. The measured η/ π⁰ ratio at high p_T also agrees within uncertainties with measurements from nucleus–nucleus collisions. The π⁰ and η yields in p–Pb relative to the scaled pp interpolated reference, R_pPb, are presented for 0.3 < p_T< 20 GeV / c and 0.7 < p_T< 20 GeV / c, respectively. The results are compared with theoretical model calculations. The values of R_pPb are consistent with unity for transverse momenta above 2 GeV / c. These results support the interpretation that the suppressed yield of neutral mesons measured in Pb–Pb collisions at LHC energies is due to parton energy loss in the hot QCD medium.

Original language	English
Article number	624
Journal	European Physical Journal C
Volume	78
Issue number	8
DOIs	https://doi.org/10.1140/epjc/s10052-018-6013-8
State	Published - 1 Aug 2018

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@article{c4585b42de71405fb0cd0126925c20ea,

title = "Neutral pion and η meson production in p–Pb collisions at √sNN = 5.02 TeV",

abstract = "Neutral pion and η meson invariant differential yields were measured in non-single diffractive p–Pb collisions at sNN = 5.02 TeV with the ALICE experiment at the CERN LHC. The analysis combines results from three complementary photon measurements, utilizing the PHOS and EMCal calorimeters and the Photon Conversion Method. The invariant differential yields of π0 and η meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of 0.30 ratio increases with pT and saturates for pT > 4 GeV / c at 0.483 ± 0. 015 stat± 0. 015 sys. A deviation from mT scaling is observed for pT< 2 GeV / c. The measured η/ π0 ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full pT range. The measured η/ π0 ratio at high pT also agrees within uncertainties with measurements from nucleus–nucleus collisions. The π0 and η yields in p–Pb relative to the scaled pp interpolated reference, RpPb, are presented for 0.3 < pT< 20 GeV / c and 0.7 < pT< 20 GeV / c, respectively. The results are compared with theoretical model calculations. The values of RpPb are consistent with unity for transverse momenta above 2 GeV / c. These results support the interpretation that the suppressed yield of neutral mesons measured in Pb–Pb collisions at LHC energies is due to parton energy loss in the hot QCD medium.",

author = "\{ALICE Collaboration\} and S. Acharya and D. Adamov{\'a} and J. Adolfsson and Aggarwal, \{M. M.\} and \{Aglieri Rinella\}, G. and M. Agnello and N. Agrawal and Z. Ahammed and Ahn, \{S. U.\} and S. Aiola and A. Akindinov and M. Al-Turany and Alam, \{S. N.\} and Albuquerque, \{D. S.D.\} and D. Aleksandrov and B. Alessandro and \{Alfaro Molina\}, R. and Y. Ali and A. Alici and A. Alkin and J. Alme and T. Alt and L. Altenkamper and I. Altsybeev and C. Andrei and D. Andreou and Andrews, \{H. A.\} and A. Andronic and M. Angeletti and V. Anguelov and C. Anson and T. Anti{\v c}i{\'c} and F. Antinori and P. Antonioli and N. Apadula and L. Aphecetche and H. Appelsh{\"a}user and S. Arcelli and R. Arnaldi and Arnold, \{O. W.\} and Arsene, \{I. C.\} and M. Arslandok and B. Audurier and A. Augustinus and R. Averbeck and Azmi, \{M. D.\} and A. Badal{\`a} and Baek, \{Y. W.\} and \{Bazo Alba\}, \{J. L.\} and Gago, \{A. M.\}",

note = "Publisher Copyright: {\textcopyright} 2018, CERN for the benefit of the ALICE collaboration.",

year = "2018",

month = aug,

day = "1",

doi = "10.1140/epjc/s10052-018-6013-8",

language = "English",

volume = "78",

journal = "European Physical Journal C",

issn = "1434-6044",

number = "8",

}

TY - JOUR

T1 - Neutral pion and η meson production in p–Pb collisions at √sNN = 5.02 TeV

AU - ALICE Collaboration

AU - Acharya, S.

AU - Adamová, D.

AU - Adolfsson, J.

AU - Aggarwal, M. M.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S. U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, S. N.

AU - Albuquerque, D. S.D.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfaro Molina, R.

AU - Ali, Y.

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Altenkamper, L.

AU - Altsybeev, I.

AU - Andrei, C.

AU - Andreou, D.

AU - Andrews, H. A.

AU - Andronic, A.

AU - Angeletti, M.

AU - Anguelov, V.

AU - Anson, C.

AU - Antičić, T.

AU - Antinori, F.

AU - Antonioli, P.

AU - Apadula, N.

AU - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arcelli, S.

AU - Arnaldi, R.

AU - Arnold, O. W.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Audurier, B.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Azmi, M. D.

AU - Badalà, A.

AU - Baek, Y. W.

AU - Bazo Alba, J. L.

AU - Gago, A. M.

PY - 2018/8/1

Y1 - 2018/8/1

N2 - Neutral pion and η meson invariant differential yields were measured in non-single diffractive p–Pb collisions at sNN = 5.02 TeV with the ALICE experiment at the CERN LHC. The analysis combines results from three complementary photon measurements, utilizing the PHOS and EMCal calorimeters and the Photon Conversion Method. The invariant differential yields of π0 and η meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of 0.30 ratio increases with pT and saturates for pT > 4 GeV / c at 0.483 ± 0. 015 stat± 0. 015 sys. A deviation from mT scaling is observed for pT< 2 GeV / c. The measured η/ π0 ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full pT range. The measured η/ π0 ratio at high pT also agrees within uncertainties with measurements from nucleus–nucleus collisions. The π0 and η yields in p–Pb relative to the scaled pp interpolated reference, RpPb, are presented for 0.3 < pT< 20 GeV / c and 0.7 < pT< 20 GeV / c, respectively. The results are compared with theoretical model calculations. The values of RpPb are consistent with unity for transverse momenta above 2 GeV / c. These results support the interpretation that the suppressed yield of neutral mesons measured in Pb–Pb collisions at LHC energies is due to parton energy loss in the hot QCD medium.

AB - Neutral pion and η meson invariant differential yields were measured in non-single diffractive p–Pb collisions at sNN = 5.02 TeV with the ALICE experiment at the CERN LHC. The analysis combines results from three complementary photon measurements, utilizing the PHOS and EMCal calorimeters and the Photon Conversion Method. The invariant differential yields of π0 and η meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of 0.30 ratio increases with pT and saturates for pT > 4 GeV / c at 0.483 ± 0. 015 stat± 0. 015 sys. A deviation from mT scaling is observed for pT< 2 GeV / c. The measured η/ π0 ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full pT range. The measured η/ π0 ratio at high pT also agrees within uncertainties with measurements from nucleus–nucleus collisions. The π0 and η yields in p–Pb relative to the scaled pp interpolated reference, RpPb, are presented for 0.3 < pT< 20 GeV / c and 0.7 < pT< 20 GeV / c, respectively. The results are compared with theoretical model calculations. The values of RpPb are consistent with unity for transverse momenta above 2 GeV / c. These results support the interpretation that the suppressed yield of neutral mesons measured in Pb–Pb collisions at LHC energies is due to parton energy loss in the hot QCD medium.

UR - https://www.scopus.com/pages/publications/85051224642

U2 - 10.1140/epjc/s10052-018-6013-8

DO - 10.1140/epjc/s10052-018-6013-8

M3 - Article

AN - SCOPUS:85051224642

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

IS - 8

M1 - 624

ER -

Neutral pion and η meson production in p–Pb collisions at √sNN = 5.02 TeV

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