Direct photon production in Pb–Pb collisions at √sNN=2.76 TeV

ALICE Collaboration

doi:10.1016/j.physletb.2016.01.020

Direct photon production in Pb–Pb collisions at √s_NN=2.76 TeV

ALICE Collaboration

Sección de Física

Faculty of Nuclear Sciences and Physical Engineering
Czech Academy of Sciences
Panjab University
CERN
National Institute for Nuclear Physics
Indian Institute of Technology Bombay
Variable Energy Cyclotron Centre
Korea Institute of Science and Technology Information
Yale University
Alikhanov Institute for Theoretical and Experimental Physics
Russian Research Centre Kurchatov Institute
University of Birmingham
Universidad Nacional Autónoma de México
Enrico Fermi Center
NASU - Bogolyubov Institute for Theoretical Physics
Universidad Autonoma de Sinaloa
Western Norway University of Applied Sciences
Goethe University Frankfurt
University of Bergen
St. Petersburg State University
Universidade de São Paulo
Horia Hulubei National Institute of Physics and Nuclear Engineering
GSI Helmholtz Centre for Heavy Ion Research
Heidelberg University
University of Münster
Ruder Boskovic Institute
Nantes Université
University of Bologna
Technische Universität München
Technical University of Munich
University of Oslo
Oak Ridge National Laboratory
Aligarh Muslim University
Kangwon National University
Konkuk University
University of Jammu
IRFU
Institute of Physics Bhubaneswar
University of Catania
Hungarian Academy of Sciences
Université Clermont Auvergne
Central China Normal University
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Joint Institute for Nuclear Research
University of Copenhagen
Inha University
Université de Strasbourg
Benemerita Universidad Autonoma de Puebla
University of Houston
Wayne State University
Moscow Engineering Physics Institute
RAS - Saint Petersburg Nuclear Physics Institute
Utrecht University
Gauhati University
University of Tsukuba
Bose Institute
National Institute of Science Education and Research
University of Texas at Austin
Lawrence Berkeley National Laboratory
Pavol Jozef Šafárik University
Pusan National University
STFC Daresbury Laboratory
University of Liverpool
National Research Foundation
Purdue University
University of Helsinki
All-Russian Scientific Research Institute of Experimental Physics
COMSATS University Islamabad
Ohio State University
Pontificia Universidad Católica del Perú
University of Tennessee, Knoxville
University of Cagliari
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
Technical University of Kosice
University of Jyväskylä
Saha Institute of Nuclear Physics
Creighton University
Universite Claude Bernard Lyon 1
Universidade Estadual de Campinas
National Institute for Subatomic Physics
Lund University
University of Cape Town
Université Grenoble Alpes
Université Paris-Saclay
Georgia State University
Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional
Institute for Space Sciences
National Centre for Nuclear Research
CIEMAT
University of Zagreb
Institute for High Energy Physics
Universidad de Santiago de Compostela
RAS - Institute for Nuclear Research
National and Kapodistrian University of Athens
Chicago State University
University of Split
Warsaw University of Technology
A. Alikhanian Yerevan Institute of Physics
The University of Tokyo
University of Tübingen
Sejong University
Slovak Academy of Sciences
Yonsei University
KTO Karatay University
University of Applied Sciences Worms
California Polytechnic State University, San Luis Obispo
Suranaree University of Technology
University of South-Eastern Norway
China National Nuclear Corporation
Lomonosov Moscow State University
University of the Witwatersrand
University of Rome La Sapienza
Comenius University
Polytechnic University of Bari
Indian Institute of Technology Indore
Hiroshima University
Nagasaki Institute of Applied Science
RAS - Budker Institute of Nuclear Physics
University of Rajasthan
Laboratori Nazionali di Legnaro
Centre de calcul de l'IN2P3
Austrian Academy of Sciences

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245 Citas (Scopus)

Resumen

Direct photon production at mid-rapidity in Pb–Pb collisions at s_NN=2.76 TeV was studied in the transverse momentum range 0.9<p_T<14 GeV/c. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the ALICE detector material with the e⁺e⁻ pair reconstructed in the central tracking system. The results of the two methods were combined and direct photon spectra were measured for the 0–20%, 20–40%, and 40–80% centrality classes. For all three classes, agreement was found with perturbative QCD calculations for p_T≳5 GeV/c. Direct photon spectra down to p_T≈1 GeV/c could be extracted for the 20–40% and 0–20% centrality classes. The significance of the direct photon signal for 0.9<p_T<2.1 GeV/c is 2.6σ for the 0–20% class. The spectrum in this p_T range and centrality class can be described by an exponential with an inverse slope parameter of (297±12^stat±41^syst) MeV. State-of-the-art models for photon production in heavy-ion collisions agree with the data within uncertainties.

Idioma original	Inglés
Páginas (desde-hasta)	235-248
Número de páginas	14
Publicación	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volumen	754
DOI	https://doi.org/10.1016/j.physletb.2016.01.020
Estado	Publicada - 10 mar. 2016

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10.1016/j.physletb.2016.01.020

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@article{200e8882a1cd405d87e142112de0e6f0,

title = "Direct photon production in Pb{\textendash}Pb collisions at √sNN=2.76 TeV",

abstract = "Direct photon production at mid-rapidity in Pb{\textendash}Pb collisions at sNN=2.76 TeV was studied in the transverse momentum range 0.9T<14 GeV/c. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the ALICE detector material with the e+e− pair reconstructed in the central tracking system. The results of the two methods were combined and direct photon spectra were measured for the 0{\textendash}20\%, 20{\textendash}40\%, and 40{\textendash}80\% centrality classes. For all three classes, agreement was found with perturbative QCD calculations for pT≳5 GeV/c. Direct photon spectra down to pT≈1 GeV/c could be extracted for the 20{\textendash}40\% and 0{\textendash}20\% centrality classes. The significance of the direct photon signal for 0.9T<2.1 GeV/c is 2.6σ for the 0{\textendash}20\% class. The spectrum in this pT range and centrality class can be described by an exponential with an inverse slope parameter of (297±12stat±41syst) MeV. State-of-the-art models for photon production in heavy-ion collisions agree with the data within uncertainties.",

author = "\{ALICE Collaboration\} and J. Adam and D. Adamov{\'a} 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 Alam, \{S. N.\} and D. Aleksandrov and B. Alessandro and D. Alexandre and \{Alfaro Molina\}, R. and A. Alici and A. Alkin and Almaraz, \{J. R.M.\} and J. Alme and T. Alt and S. Altinpinar and I. Altsybeev and \{Alves Garcia Prado\}, C. and C. Andrei and A. Andronic and V. Anguelov and J. Anielski and T. Anti{\v c}i{\'c} and F. Antinori and P. Antonioli 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 Awes, \{T. C.\} and Azmi, \{M. D.\} and A. Badal{\`a} and Baek, \{Y. W.\} and S. Bagnasco and R. Bailhache and R. Bala and A. Baldisseri and Baral, \{R. C.\} and Gago, \{A. M.\}",

note = "Publisher Copyright: {\textcopyright} 2016 CERN for the benefit of the ALICE Collaboration",

year = "2016",

month = mar,

day = "10",

doi = "10.1016/j.physletb.2016.01.020",

language = "English",

volume = "754",

pages = "235--248",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

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TY - JOUR

T1 - Direct photon production in Pb–Pb collisions at √sNN=2.76 TeV

AU - ALICE Collaboration

AU - Adam, J.

AU - Adamová, D.

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 - Alam, S. N.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alexandre, D.

AU - Alfaro Molina, R.

AU - Alici, A.

AU - Alkin, A.

AU - Almaraz, J. R.M.

AU - Alme, J.

AU - Alt, T.

AU - Altinpinar, S.

AU - Altsybeev, I.

AU - Alves Garcia Prado, C.

AU - Andrei, C.

AU - Andronic, A.

AU - Anguelov, V.

AU - Anielski, J.

AU - Antičić, T.

AU - Antinori, F.

AU - Antonioli, P.

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 - Awes, T. C.

AU - Azmi, M. D.

AU - Badalà, A.

AU - Baek, Y. W.

AU - Bagnasco, S.

AU - Bailhache, R.

AU - Bala, R.

AU - Baldisseri, A.

AU - Baral, R. C.

AU - Gago, A. M.

PY - 2016/3/10

Y1 - 2016/3/10

N2 - Direct photon production at mid-rapidity in Pb–Pb collisions at sNN=2.76 TeV was studied in the transverse momentum range 0.9T<14 GeV/c. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the ALICE detector material with the e+e− pair reconstructed in the central tracking system. The results of the two methods were combined and direct photon spectra were measured for the 0–20%, 20–40%, and 40–80% centrality classes. For all three classes, agreement was found with perturbative QCD calculations for pT≳5 GeV/c. Direct photon spectra down to pT≈1 GeV/c could be extracted for the 20–40% and 0–20% centrality classes. The significance of the direct photon signal for 0.9T<2.1 GeV/c is 2.6σ for the 0–20% class. The spectrum in this pT range and centrality class can be described by an exponential with an inverse slope parameter of (297±12stat±41syst) MeV. State-of-the-art models for photon production in heavy-ion collisions agree with the data within uncertainties.

AB - Direct photon production at mid-rapidity in Pb–Pb collisions at sNN=2.76 TeV was studied in the transverse momentum range 0.9T<14 GeV/c. Photons were detected with the highly segmented electromagnetic calorimeter PHOS and via conversions in the ALICE detector material with the e+e− pair reconstructed in the central tracking system. The results of the two methods were combined and direct photon spectra were measured for the 0–20%, 20–40%, and 40–80% centrality classes. For all three classes, agreement was found with perturbative QCD calculations for pT≳5 GeV/c. Direct photon spectra down to pT≈1 GeV/c could be extracted for the 20–40% and 0–20% centrality classes. The significance of the direct photon signal for 0.9T<2.1 GeV/c is 2.6σ for the 0–20% class. The spectrum in this pT range and centrality class can be described by an exponential with an inverse slope parameter of (297±12stat±41syst) MeV. State-of-the-art models for photon production in heavy-ion collisions agree with the data within uncertainties.

UR - https://www.scopus.com/pages/publications/85040813298

U2 - 10.1016/j.physletb.2016.01.020

DO - 10.1016/j.physletb.2016.01.020

M3 - Article

AN - SCOPUS:85040813298

SN - 0370-2693

VL - 754

SP - 235

EP - 248

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics