Measurement of photon–jet transverse momentum correlations in 5.02 TeV Pb + Pb and pp collisions with ATLAS

The ATLAS collaboration

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Abstract

Jets created in association with a photon can be used as a calibrated probe to study energy loss in the medium created in nuclear collisions. Measurements of the transverse momentum balance between isolated photons and inclusive jets are presented using integrated luminosities of 0.49 nb−1 of Pb + Pb collision data at sNN=5.02 TeV and 25 pb−1 of pp collision data at s=5.02 TeV recorded with the ATLAS detector at the LHC. Photons with transverse momentum 63.1<pT γ<200 GeV and |ηγ|<2.37 are paired with all jets in the event that have pT jet>31.6 GeV and pseudorapidity |ηjet|<2.8. The transverse momentum balance given by the jet-to-photon pT ratio, x, is measured for pairs with azimuthal opening angle Δϕ>7π/8. Distributions of the per-photon jet yield as a function of x, (1/Nγ)(dN/dx), are corrected for detector effects via a two-dimensional unfolding procedure and reported at the particle level. In pp collisions, the distributions are well described by Monte Carlo event generators. In Pb + Pb collisions, the x distribution is modified from that observed in pp collisions with increasing centrality, consistent with the picture of parton energy loss in the hot nuclear medium. The data are compared with a suite of energy-loss models and calculations.

Original languageEnglish
Pages (from-to)167-190
Number of pages24
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume789
DOIs
StatePublished - 10 Feb 2019

Funding

FundersFunder number
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
BSF-NSF
Agence Nationale de la Recherche
Australian Research Council
Centre National pour la Recherche Scientifique et Technique
Fundação para a Ciência e a Tecnologia
National Research Foundation of Korea
Comisión Nacional de Investigación Científica y Tecnológica
University of Washington College of Arts and Sciences
Narodowe Centrum Nauki
Services Fédéraux des Affaires Scientifiques, Techniques et Culturelles
CEA-DRF
Japan Society for the Promotion of Science
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministry of Science and Technology, Taiwan
Israel Science Foundation
Wallenberg Foundation
Leverhulme Trust
Spine Education and Research Institute
Arizona-Nevada Academy of Science
Javna Agencija za Raziskovalno Dejavnost RS
Engineering Research Centers
Generalitat de Catalunya
Instituto Nazionale di Fisica Nucleare
Bundesministerium für Wissenschaft, Forschung und Wirtschaft
Austrian Science Fund
Department of Science and Technology, Ministry of Science and Technology, India
MSMT
Türkiye Atom Enerjisi Kurumu
MSSR
Ministerio de Economía y Competitividad
Azərbaycan Respirator Cəmiyyəti
Max-Planck-Gesellschaft
Bundesministerium für Bildung und Forschung
Northern Ireland Community Relations Council
Canada Foundation for Innovation
Helmholtz-Gemeinschaft
Danmarks Grundforskningsfond
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Czech Republic
Singapore Eye Research Institute
Canarie
MIZŠ
Deutsche Forschungsgemeinschaft
California Department of Fish and Game
Ministry of Science and Technology
MESTD
U.S. Department of Energy
European Cooperation in Science and Technology
EU-ESF
RGC
National Research Council
Bundesministerium für Bildung und Frauen
Fundação de Amparo à Pesquisa do Estado de São Paulo
National Science Foundation1812377
MES of Russia
National Research Center "Kurchatov Institute"
Institutul de Fizică Atomică
Natural Sciences and Engineering Research Council of Canada
General Secretariat for Research and Technology
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
Fundació Catalana de Trasplantament
Iowa Science Foundation
Consejo Nacional de Innovación, Ciencia y Tecnología
Generalitat de Catalunya , Spain
TRIUMF
German-Israeli Foundation for Scientific Research and Development
Narodowym Centrum Nauki
Strategic Research Council
H2020 European Research Council
Cantons of Bern and Geneva
Chinese Academy of Sciences
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
VSC CR
Poultry Industry Council
Compute Canada
MNE
Agencia Nacional de Promoción Científica y Tecnológica
Royal Society
European Regional Development Fund
Ministerstwo Nauki i Szkolnictwa Wyższego
IRFU
CERN
Joint Institute for Nuclear Research
Horizon 2020 , and Marie Skłodowska-Curie Actions
Brookhaven National Laboratory
Ministerstvo Průmyslu a Obchodu
Alexander von Humboldt-Stiftung
Council on grants of the President of the Russian Federation
Horizon 2020
British Columbia Knowledge Development Fund
Ministry of Education, Culture, Sports, Science and Technology
National Natural Science Foundation of China
Science and Technology Facilities CouncilST/J005533/1, ST/K001310/1, ST/L006162/1, ST/N000447/1, ST/J004804/1, ST/M000753/1, ST/N000307/1, ST/L003449/1, ST/H001158/2, GRIDPP, ST/N000420/1
DNSRCIN2P3-CNRS

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