Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.222301
Keywords
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Funding
- Grid centres
- Worldwide LHC Computing Grid (WLCG) collaboration
- State Committee of Science
- World Federation of Scientists (WFS)
- Swiss Fonds Kidagan, Armenia
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Financiadora de Estudos e Projetos (FINEP)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- National Natural Science Foundation of China (NSFC)
- Chinese Ministry of Education (CMOE)
- Ministry of Science and Technology of China (MSTC)
- Ministry of Education and Youth of the Czech Republic
- Danish Natural Science Research Council
- Carlsberg Foundation
- Danish National Research Foundation
- European Research Council under the European Community's Seventh Framework Programme
- Helsinki Institute of Physics
- Academy of Finland
- French CNRS-IN2P3
- Region Pays de Loire
- Region Alsace
- Region Auvergne
- CEA, France
- German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie (BMBF)
- Helmholtz Association
- General Secretariat for Research and Technology, Ministry of Development, Greece
- Hungarian Orszagos Tudomanyos Kutatasi Alappgrammok (OTKA)
- National Office for Research and Technology (NKTH)
- Department of Atomic Energy of the Government of India
- Department of Science and Technology of the Government of India
- Istituto Nazionale di Fisica Nucleare (INFN)
- Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Italy
- MEXT
- Joint Institute for Nuclear Research, Dubna
- National Research Foundation of Korea (NRF)
- Consejo Nacional de Cienca y Tecnologia (CONACYT)
- Direccion General de Asuntos del Personal Academico (DGAPA), Mexico
- Amerique Latine Formation academique-European Commission (ALF-AEC)
- EPLANET Program (European Particle Physics Latin American Network)
- Stichting voor Fundamenteel Onderzoek der Materie (FOM)
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands
- Research Council of Norway (NFR)
- National Science Centre, Poland
- Ministry of National Education/Institute for Atomic Physics
- National Council of Scientific Research in Higher Education (CNCSI-UEFISCDI), Romania
- Ministry of Education and Science of Russian Federation
- Russian Academy of Sciences
- Russian Federal Agency of Atomic Energy
- Russian Federal Agency for Science and Innovations
- Russian Foundation for Basic Research
- Ministry of Education of Slovakia
- Department of Science and Technology, South Africa
- Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT)
- E-Infrastructure shared between Europe and Latin America (EELA)
- Ministerio de Economia y Competitividad (MINECO) of Spain
- Xunta de Galicia (Conselleria de Educacion)
- Centro de Aplicaciones Tecnolgicas y Desarrollo Nuclear (CEADEN)
- Cubaenergia, Cuba
- IAEA (International Atomic Energy Agency)
- Swedish Research Council (VR)
- Knut & Alice Wallenberg Foundation (KAW)
- Ukraine Ministry of Education and Science
- United Kingdom Science and Technology Facilities Council (STFC)
- United States Department of Energy
- United States National Science Foundation
- State of Texas
- State of Ohio
- Ministry of Science, Education and Sports of Croatia and Unity through Knowledge Fund, Croatia
- Council of Scientific and Industrial Research (CSIR), New Delhi, India
- Pontificia Universidad Catolica del Peru
- STFC [ST/L005670/1, ST/L005751/1, ST/N00261X/1, ST/J000108/1, ST/M001601/1, ST/M001598/1, ST/M00340X/1, ST/M00158X/1, 2014 STFC Nuclear Physics CG, ALICE] Funding Source: UKRI
- Science and Technology Facilities Council [ST/M001598/1, ST/N00261X/1, ST/J000108/1, ST/L005751/1, 2014 STFC Nuclear Physics CG, 1521430, ST/M001601/1, GRIDPP, ST/M00340X/1, 1523365, ALICE, ST/L005670/1, ST/M00158X/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [1307461] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [26610071, 15H03664, 25287048] Funding Source: KAKEN
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We report on the first measurement of an excess in the yield of J/psi at very low transverse momentum (pT < 0.3 GeV/c) in peripheral hadronic Pb-Pb collisions at root s(NN) = 2.76 TeV, performed by ALICE at the CERN LHC. Remarkably, the measured nuclear modification factor of J/psi in the rapidity range 2.5 < y < 4 reaches about 7 (2) in the p(T) range 0-0.3 GeV/c in the 70%-90% (50%-70%) centrality class. The J/psi production cross section associated with the observed excess is obtained under the hypothesis that coherent photoproduction of J/psi is the underlying physics mechanism. If confirmed, the observation of J/psi coherent photoproduction in Pb-Pb collisions at impact parameters smaller than twice the nuclear radius opens new theoretical and experimental challenges and opportunities. In particular, coherent photoproduction accompanying hadronic collisions may provide insight into the dynamics of photoproduction and nuclear reactions, as well as become a novel probe of the quark-gluon plasma.
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