First measurement of coherent ρ0 photoproduction in ultra-peripheral Xe–Xe collisions at sNN=5.44 TeV

doi:10.1016/j.physletb.2021.136481

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First measurement of coherent ρ0 photoproduction in ultra-peripheral Xe–Xe collisions at sNN=5.44 TeV

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First measurement of coherent ρ0 photoproduction in ultra-peripheral Xe–Xe collisions at sNN=5.44 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol.820, 136481

820

09/10/2021

DOI: https://doi.org/10.1016/j.physletb.2021.136481

Abstract

Nuclear and High Energy Physics

The first measurement of the coherent photoproduction of ρ0 vector mesons in ultra-peripheral Xe–Xe collisions at sNN=5.44 TeV is presented. This result, together with previous HERA γp data and γ–Pb measurements from ALICE, describes the atomic number (A) dependence of this process, which is particularly sensitive to nuclear shadowing effects and to the approach to the black-disc limit of QCD at a semi-hard scale. The cross section of the Xe+Xe→ρ0+Xe+Xe process, measured at midrapidity through the decay channel ρ0→π+π−, is found to be dσ/dy=131.5±5.6(stat.)−16.9+17.5(syst.) mb. The ratio of the continuum to resonant contributions for the production of pion pairs is also measured. In addition, the fraction of events accompanied by electromagnetic dissociation of either one or both colliding nuclei is reported. The dependence on A of cross section for the coherent ρ0 photoproduction at a centre-of-mass energy per nucleon of the γA system of WγA,n=65 GeV is found to be consistent with a power-law behaviour σ(γA→ρ0A)∝Aα with a slope α=0.96±0.02(syst.). This slope signals important shadowing effects, but it is still far from the behaviour expected in the black-disc limit.

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Title: First measurement of coherent ρ0 photoproduction in ultra-peripheral Xe–Xe collisions at sNN=5.44 TeV
Publication Details: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol.820, 136481
Series: 820
Grant note: The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. 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: A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation (ANSL), State Committee of Science and World Federation of Scientists (WFS), Armenia; Austrian Academy of Sciences , Austrian Science Fund ( FWF ): [M 2467-N36] and Nationalstiftung für Forschung, Technologie und Entwicklung, Austria; Ministry of Communications and High Technologies , National Nuclear Research Center , Azerbaijan; Conselho Nacional de Desenvolvimento Científico e Tecnológico ( CNPq ), Financiadora de Estudos e Projetos (Finep), Fundação de Amparo à Pesquisa do Estado de São Paulo ( FAPESP ) and Universidade Federal do Rio Grande do Sul ( UFRGS ), Brazil; Ministry of Education of China (MOEC), Ministry of Science & Technology of China (MSTC) and National Natural Science Foundation of China ( NSFC ), China; Ministry of Science and Education and Croatian Science Foundation , Croatia; Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear ( CEADEN ), Cubaenergía, Cuba; Ministry of Education, Youth and Sports of the Czech Republic , Czech Republic; Czech Science Foundation ; The Danish Council for Independent Research | Natural Sciences , the Villum Fonden and Danish National Research Foundation ( DNRF ), Denmark; Helsinki Institute of Physics (HIP), Finland; Commissariat à l'Énergie Atomique ( CEA ) and Institut National de Physique Nucléaire et de Physique des Particules ( IN2P3 ) and Centre National de la Recherche Scientifique ( CNRS ), France; Bundesministerium für Bildung und Forschung ( BMBF ) and GSI Helmholtzzentrum für Schwerionenforschung GmbH , Germany; General Secretariat for Research and Technology , Ministry of Education, Research and Religions , Greece; National Research, Development and Innovation Office , Hungary; Department of Atomic Energy, Government of India ( DAE ), Department of Science and Technology , Government of India ( DST ), University Grants Commission , Government of India ( UGC ) and Council of Scientific and Industrial Research ( CSIR ), India; Indonesian Institute of Science , Indonesia; Istituto Nazionale di Fisica Nucleare ( INFN ), Italy; Institute for Innovative Science and Technology , Nagasaki Institute of Applied Science ( IIST ), Japanese Ministry of Education, Culture, Sports, Science and Technology ( MEXT ) and Japan Society for the Promotion of Science ( JSPS ) KAKENHI , Japan; Consejo Nacional de Ciencia (CONACYT) y Tecnología , through Fondo de Cooperación Internacional en Ciencia y Tecnología ( FONCICYT ) and Dirección General de Asuntos del Personal Academico ( DGAPA ), Mexico; Nederlandse Organisatie voor Wetenschappelijk Onderzoek ( NWO ), Netherlands; The Research Council of Norway , Norway; Commission on Science and Technology for Sustainable Development in the South ( COMSATS ), Pakistan; Pontificia Universidad Católica del Perú , Peru; Ministry of Science and Higher Education , National Science Centre and WUT ID-UB , Poland; Korea Institute of Science and Technology Information and National Research Foundation of Korea ( NRF ), Republic of Korea; Ministry of Education and Scientific Research , Institute of Atomic Physics and Ministry of Research and Innovation and Institute of Atomic Physics , Romania; Joint Institute for Nuclear Research ( JINR ), Ministry of Education and Science of the Russian Federation , National Research Centre Kurchatov Institute , Russian Science Foundation and Russian Foundation for Basic Research , Russia; Ministry of Education, Science, Research and Sport of the Slovak Republic , Slovakia; National Research Foundation of South Africa, South Africa; Swedish Research Council ( VR ) and Knut & Alice Wallenberg Foundation (KAW) , Sweden; European Organization for Nuclear Research , Switzerland; Suranaree University of Technology ( SUT ), National Science and Technology Development Agency ( NSDTA ) and Office of the Higher Education Commission under NRU project of Thailand, Thailand; Turkish Atomic Energy Agency ( TAEK ), Turkey; National Academy of Sciences of Ukraine , Ukraine; Science and Technology Facilities Council ( STFC ), United Kingdom; National Science Foundation of the United States of America ( NSF ) and United States Department of Energy , Office of Nuclear Physics ( DOE NP ), United States of America. Funding Information: The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. 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: A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation (ANSL), State Committee of Science and World Federation of Scientists (WFS), Armenia; Austrian Academy of Sciences, Austrian Science Fund (FWF): [M 2467-N36] and Nationalstiftung für Forschung, Technologie und Entwicklung, Austria; Ministry of Communications and High Technologies, National Nuclear Research Center, Azerbaijan; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Financiadora de Estudos e Projetos (Finep), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Universidade Federal do Rio Grande do Sul (UFRGS), Brazil; Ministry of Education of China (MOEC), Ministry of Science & Technology of China (MSTC) and National Natural Science Foundation of China (NSFC), China; Ministry of Science and Education and Croatian Science Foundation, Croatia; Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Cubaenergía, Cuba; Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic; Czech Science Foundation; The Danish Council for Independent Research | Natural Sciences, the Villum Fonden and Danish National Research Foundation (DNRF), Denmark; Helsinki Institute of Physics (HIP), Finland; Commissariat à l'Énergie Atomique (CEA) and Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) and Centre National de la Recherche Scientifique (CNRS), France; Bundesministerium für Bildung und Forschung (BMBF) and GSI Helmholtzzentrum für Schwerionenforschung GmbH, Germany; General Secretariat for Research and Technology, Ministry of Education, Research and Religions, Greece; National Research, Development and Innovation Office, Hungary; Department of Atomic Energy, Government of India (DAE), Department of Science and Technology, Government of India (DST), University Grants Commission, Government of India (UGC) and Council of Scientific and Industrial Research (CSIR), India; Indonesian Institute of Science, Indonesia; Istituto Nazionale di Fisica Nucleare (INFN), Italy; Institute for Innovative Science and Technology, Nagasaki Institute of Applied Science (IIST), Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and Japan Society for the Promotion of Science (JSPS) KAKENHI, Japan; Consejo Nacional de Ciencia (CONACYT) y Tecnología, through Fondo de Cooperación Internacional en Ciencia y Tecnología (FONCICYT) and Dirección General de Asuntos del Personal Academico (DGAPA), Mexico; Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; The Research Council of Norway, Norway; Commission on Science and Technology for Sustainable Development in the South (COMSATS), Pakistan; Pontificia Universidad Católica del Perú, Peru; Ministry of Science and Higher Education, National Science Centre and WUT ID-UB, Poland; Korea Institute of Science and Technology Information and National Research Foundation of Korea (NRF), Republic of Korea; Ministry of Education and Scientific Research, Institute of Atomic Physics and Ministry of Research and Innovation and Institute of Atomic Physics, Romania; Joint Institute for Nuclear Research (JINR), Ministry of Education and Science of the Russian Federation, National Research Centre Kurchatov Institute, Russian Science Foundation and Russian Foundation for Basic Research, Russia; Ministry of Education, Science, Research and Sport of the Slovak Republic, Slovakia; National Research Foundation of South Africa, South Africa; Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW), Sweden; European Organization for Nuclear Research, Switzerland; Suranaree University of Technology (SUT), National Science and Technology Development Agency (NSDTA) and Office of the Higher Education Commission under NRU project of Thailand, Thailand; Turkish Atomic Energy Agency (TAEK), Turkey; National Academy of Sciences of Ukraine, Ukraine; Science and Technology Facilities Council (STFC), United Kingdom; National Science Foundation of the United States of America (NSF) and United States Department of Energy, Office of Nuclear Physics (DOE NP), United States of America.
Identifiers: 991005930454302656
Academic Unit: Physics
Language: English
Resource Type: Journal article