Coherent ρ 0 photoproduction in ultra-peripheral Pb-Pb collisions at √sNN=2.76 TeV
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Abstract
We report the first measurement at the LHC of coherent photoproduction of ρ 0
mesons in ultra-peripheral Pb-Pb collisions. The invariant mass and transverse momentum
distributions for ρ 0 production are studied in the + − decay channel at mid-rapidity.
The production cross section in the rapidity range |y| < 0.5 is found to be d /dy = 425 ±
10 (stat.) +42
−50 (sys.) mb. Coherent ρ 0 production is studied with and without requirement
of nuclear breakup, and the fractional yields for various breakup scenarios are presented.
The results are compared with those from lower energies and with model predictions
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Bibliographic citation
Adam, J., Adamová, D., Aggarwal, M.M. et al. Coherent ρ 0 photoproduction in ultra-peripheral Pb-Pb collisions at √sNN=2.76 TeV. J. High Energ. Phys. 2015, 95 (2015). https://doi.org/10.1007/JHEP09(2015)095
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https://doi.org/10.1007/JHEP09(2015)095Sponsors
The ALICE Collaboration
gratefully acknowledges the resources and support provided by all Grid centres and the
Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges
the following funding agencies for their support in building and running the
ALICE detector: State Committee of Science, World Federation of Scientists (WFS) and
Swiss Fonds Kidagan, Armenia, Conselho Nacional de Desenvolvimento Científico e Tecnológico
(CNPq), Financiadora de Estudos e Projetos (FINEP),
Fundação de Amparo à Pesquisa do Estado de Săo Paulo (FAPESP); National Natural Science Foundation of China
(NSFC), the Chinese Ministry of Education (CMOE) and the Ministry of Science and Technology
of China (MSTC); Ministry of Education and Youth of the Czech Republic; Danish
Natural Science Research Council, the Carlsberg Foundation and the Danish National Research
Foundation; The European Research Council under the European Community’s
Seventh Framework Programme; Helsinki Institute of Physics and the Academy of Finland;
French CNRS-IN2P3, the ‘Region Pays de Loire’, ‘Region Alsace’, ‘Region Auvergne’
and CEA, France; German Bundesministerium fur Bildung, Wissenschaft, Forschung und
Technologie (BMBF) and the Helmholtz Association; General Secretariat for Research and
Technology, Ministry of Development, Greece; Hungarian Orszagos Tudomanyos Kutatasi
Alappgrammok (OTKA) and National Office for Research and Technology (NKTH); Department
of Atomic Energy and Department of Science and Technology of the Government
of India; Istituto Nazionale di Fisica Nucleare (INFN) and Centro Fermi — Museo Storico
della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Italy; MEXT Grant-in-Aid for
Specially Promoted Research, Japan; 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), México:
Amerique Latine Formation academique — European Commission (ALFA-EC) and the
EPLANET Program (European Particle Physics Latin American Network) Stichting voor
Fundamenteel Onderzoek der Materie (FOM) and the Nederlandse Organisatie voorWetenschappelijk
Onderzoek (NWO), Netherlands; Research Council of Norway (NFR); National
Science Centre, Poland; Ministry of National Education/Institute for Atomic Physics and
Consiliul National al Cercetarii Stiintifice — Executive Agency for Higher Education Research
Development and Innovation Funding (CNCS-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
and The 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 Econom´ıa y Competitividad (MINECO) of Spain,
Xunta de Galicia (Consellería de Educación), Centro de Aplicaciones Tecnológicas y Desarrollo
Nuclear (CEADEN), Cubaenergía, Cuba, and IAEA (International Atomic Energy
Agency); Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation
(KAW); Ukraine Ministry of Education and Science; United Kingdom Science and Technology
Facilities Council (STFC); The United States Department of Energy, the United
States National Science Foundation, the State of Texas, and the 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.
Rights
© CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made