Published August 4, 2023 | Version Published
Journal Article Open

Azimuthal Correlations within Exclusive Dijets with Large Momentum Transfer in Photon-Lead Collisions

Creators

  • 1. ROR icon California Institute of Technology

Abstract

The structure of nucleons is multidimensional and depends on the transverse momenta, spatial geometry, and polarization of the constituent partons. Such a structure can be studied using high-energy photons produced in ultraperipheral heavy-ion collisions. The first measurement of the azimuthal angular correlations of exclusively produced events with two jets in photon-lead interactions at large momentum transfer is presented, a process that is considered to be sensitive to the underlying nuclear gluon polarization. This study uses a data sample of ultraperipheral lead-lead collisions at √𝑠NN=5.02  TeV, corresponding to an integrated luminosity of 0.38  nb⁻¹, collected with the CMS experiment at the LHC. The measured second harmonic of the correlation between the sum and difference of the two jet transverse momentum vectors is found to be positive, and rising, as the dijet transverse momentum increases. A well-tuned model that has been successful at describing a wide range of proton scattering data from the HERA experiments fails to describe the observed correlations, suggesting the presence of gluon polarization effects.

Copyright and License

© 2023 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Acknowledgement

We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid and other centers for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC, the CMS detector, and the supporting computing infrastructure provided by the following funding agencies: BMBWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES and BNSF (Bulgaria); CERN; CAS, MoST, and NSFC (China); MINCIENCIAS (Colombia); MSES and CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); MoER, ERC PUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRI (Greece); NKFIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LAS (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montenegro); MBIE (New Zealand); PAEC (Pakistan); MES and NSC (Poland); FCT (Portugal); MESTD (Serbia); MCIN/AEI and PCTI (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); MHESI and NSTDA (Thailand); TUBITAK and TENMAK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (U.S.).

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Identifiers

ISSN
1079-7114

Funding

Federal Ministry of Education, Science and Research
FWF Austrian Science Fund
Fund for Scientific Research
Research Foundation - Flanders
30820817
National Council for Scientific and Technological Development
Coordenação de Aperfeicoamento de Pessoal de Nível Superior
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul
Fundação de Amparo à Pesquisa do Estado de São Paulo
Ministry of Education and Science
European Organization for Nuclear Research
Chinese Academy of Sciences
Ministry of Science and Technology of the People's Republic of China
National Natural Science Foundation of China
Departamento Administrativo de Ciencia, Tecnología e Innovación
Ministry of Science, Education and Sports
Croatian Science Foundation
Research and Innovation Foundation
Secretaría de Educación Superior, Ciencia, Tecnología e Innovación
Ministry of Education and Research
Estonian Research Council
European Commission
Research Council of Finland
Institut National de Physique Nucléaire et de Physique des Particules
Centre National de la Recherche Scientifique
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Federal Ministry of Education and Research
Deutsche Forschungsgemeinschaft
EXC 2121
Deutsche Forschungsgemeinschaft
390833306
Deutsche Forschungsgemeinschaft
400140256—GRK2497
Helmholtz-Gemeinschaft
General Secretariat for Research and Technology
National Research, Development and Innovation Office
123842
National Research, Development and Innovation Office
123959
National Research, Development and Innovation Office
124845
National Research, Development and Innovation Office
124850
National Research, Development and Innovation Office
125105
National Research, Development and Innovation Office
128713
National Research, Development and Innovation Office
128786
National Research, Development and Innovation Office
129058
Department of Atomic Energy
Department of Science and Technology
Institute for Research in Fundamental Sciences
Science Foundation Ireland
Istituto Nazionale di Fisica Nucleare
Ministry of Education
National Research Foundation of Korea
Ministry of Education and Science
Lithuanian Academy of Sciences
Ministry of Higher Education
University of Malaya
Benemérita Universidad Autónoma de Puebla
Instituto Politécnico Nacional
Consejo Nacional de Humanidades, Ciencias y Tecnologías
Secretariat of Public Education
Autonomous University of San Luis Potosí
Ministry of Business, Innovation and Employment
Pakistan Atomic Energy Commission
Ministry of Science and Higher Education
14.W03.31.0026
Ministry of Science and Higher Education
Harmonia 2014/14/M/ST2/00428
Ministry of Science and Higher Education
Opus 2014/13/B/ST2/02543
Ministry of Science and Higher Education
2014/15/B/ST2/03998
Ministry of Science and Higher Education
2015/19/B/ST2/02861
Ministry of Science and Higher Education
Sonata-bis 2012/07/E/ST2/01406
National Science Center
Fundação para a Ciência e Tecnologia
Joint Institute for Nuclear Research
The Ministry of Education and Science of the Russian Federation
Rosatom (Russia)
Russian Academy of Sciences
Russian Foundation for Basic Research
Petersburg Nuclear Physics Institute
Ministry of Education, Science and Technological Development
Secretaría de Estado de Investigacion, Desarrollo e Innovacion
Gobierno del Principado de Asturias
Ministry of Science, Technology and Research
ETH Zurich
Paul Scherrer Institute
Swiss National Science Foundation
National Science and Technology Council
Thailand Center of Excellence in Physics
National Science and Technology Development Agency
Scientific and Technological Research Council of Turkey
Turkish Atomic Energy Authority
National Academy of Sciences of Ukraine
Science and Technology Facilities Council
United States Department of Energy
National Science Foundation
European Research Council
European Commission
675440
European Commission
724704
European Commission
752730
European Commission
765710
A G Leventis Foundation
Alfred P. Sloan Foundation
Alexander von Humboldt Foundation
Belgian Federal Science Policy Office
Fund for Scientific Research
Agentschap voor Innovatie door Wetenschap en Technologie
Beijing Municipal Science and Technology Commission
Z191100007219010
Ministry of Education Youth and Sports
Hungarian Academy of Sciences
Council of Scientific and Industrial Research
Foundation for Polish Science
Qatar National Research Fund
European Commission
Chulalongkorn University
The Kavli Foundation
Nvidia (United States)
Welch Foundation
C-1845
Weston Havens Foundation
Université Catholique de Louvain
Universidade do Estado do Rio de Janeiro
Institute of High Energy Physics
National Institute of Chemical Physics and Biophysics
Deutsches Elektronen-Synchrotron DESY
Karlsruhe Institute of Technology
RWTH Aachen University
Wigner Research Centre for Physics
Tata Institute of Fundamental Research
University of Pisa
Sapienza University of Rome
Kyungpook National University
Quaid-i-Azam University
Korea Institute of Science & Technology Information
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
Middle East Technical University
Brunel University London
Imperial College London
Queen Mary University of London
Rutherford Appleton Laboratory
University of Bristol
University of Oxford
Baylor University
California Institute of Technology
Fermi National Accelerator Laboratory
Massachusetts Institute of Technology
National Energy Research Scientific Computing Center
Purdue University West Lafayette
San Diego Supercomputer Center
University of California System
University of Colorado Boulder
University of Florida
University of Nebraska–Lincoln
University of Wisconsin–Madison
Vanderbilt University
Finnish Ministry of Education and Culture
Helsinki Institute of Physics
LNS
MOS
Programa Consolider-Ingenio 2010
ETH Board
UniZH
Canton Zurich
SER
Institute for the Promotion of Teaching Science and Technology of Thailand
Special Task Force for Activating Research
Marie-Curie programme
ÚNKP
Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia María de Maeztu
MDM-2015-0509
Programa Severo Ochoa del Principado de Asturias
Institut für Hochenergiephysik, Wien
Inter University Institute For High Energies, Brussel
São Paulo Research and Analysis Center, São Paulo
Helsinki Institute of Physics, Helsinki
Institut de recherche sur les lois fondamentales de l'Univers, CEA, Université Paris-Saclay, Gif-sur-Yvette
Institut national de physique nucléaire et de physique des particules, IN2P3, Villeurbanne
Institut Pluridisciplinaire Hubert Curien (IPHC), Strasbourg
Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau
University of Ioánnina, Ioánnina
INFN CNAF, Bologna
INFN Sezione di Bari, Università di Bari, Politecnico di Bari, Bari
Laboratori Nazionali di Legnaro, Legnaro
National Centre for Nuclear Research, Swierk
Laboratório de Instrumentação e Física Experimental de Partículas, Lisboa
Institute for High Energy Physics of National Research Centre `Kurchatov Institute', Protvino
Institute for Nuclear Research (INR) of the Russian Academy of Sciences, Troitsk
Institute for Theoretical and Experimental Physics named by A.I. Alikhanov of NRC 'Kurchatov Institute', Moscow
Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander
Port d'Informació Científica, Bellaterra
CSCS—Swiss National Supercomputing Centre, Lugano
National Center for High-performance Computing (NCHC), Tainan City
National Scientific Center, Kharkov Institute of Physics and Technology, Kharkov
GridPP, Royal Holloway, University of London, London
GridPP, Rutherford Appleton Laboratory, Didcot
Open Science Grid
Pittsburgh Supercomputing Center (PSC), Pittsburgh
Texas Advanced Computing Center

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