Scattering Studies with Low-Energy Kaon-Proton Femtoscopy in Proton-Proton Collisions at the LHC

(A Large Ion Collider Experiment Collaboration)

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19 Citations (Scopus)


The study of the strength and behavior of the antikaon-nucleon (K̄N) interaction constitutes one of the key focuses of the strangeness sector in low-energy quantum chromodynamics (QCD). In this Letter a unique high-precision measurement of the strong interaction between kaons and protons, close and above the kinematic threshold, is presented. The femtoscopic measurements of the correlation function at low pair-frame relative momentum of (K+p⊕K-p) and (K-p⊕K+p) pairs measured in pp collisions at s=5, 7, and 13 TeV are reported. A structure observed around a relative momentum of 58 MeV/c in the measured correlation function of (K-p⊕K+p) with a significance of 4.4σ constitutes the first experimental evidence for the opening of the (K̄0n.K0n) isospin breaking channel due to the mass difference between charged and neutral kaons. The measured correlation functions have been compared to Jülich and Kyoto models in addition to the Coulomb potential. The high-precision data at low relative momenta presented in this work prove femtoscopy to be a powerful complementary tool to scattering experiments and provide new constraints above the K̄N threshold for low-energy QCD chiral models.

Original languageEnglish
Article number092301
JournalPhysical review letters
Issue number9
Publication statusPublished - 2020 Mar 6

Bibliographical note

Funding Information:
The ALICE Collaboration is grateful to Professor Tetsuo Hyodo and Professor Johann Haidenbauer for the valuable suggestions and discussions. 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: the A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation (ANSL) and the State Committee of Science and World Federation of Scientists (WFS), Armenia; the Austrian Academy of Sciences, Austrian Science Fund (FWF): [M 2467-N36] and Nationalstiftung für Forschung, Technologie und Entwicklung, Austria; the Ministry of Communications and High Technologies, National Nuclear Research Center, Azerbaijan; the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Universidade Federal do Rio Grande do Sul (UFRGS), Financiadora de Estudos e Projetos (Finep) and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Brazil; the Ministry of Science & Technology of China (MSTC), the National Natural Science Foundation of China (NSFC), and the Ministry of Education of China (MOEC), China; the Croatian Science Foundation and Ministry of Science and Education, Croatia; the Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Cubaenergía, Cuba; the Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic; The Danish Council for Independent Research | Natural Sciences, the Carlsberg Foundation and the Danish National Research Foundation (DNRF), Denmark; the Helsinki Institute of Physics (HIP), Finland; the Commissariat à l’Energie Atomique (CEA), the Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), and the Centre National de la Recherche Scientifique (CNRS) and Région des Pays de la Loire, France; Bundesministerium für Bildung und Forschung (BMBF) and GSI Helmholtzzentrum für Schwerionenforschung GmbH, Germany; the General Secretariat for Research and Technology, Ministry of Education, Research and Religions, Greece; the National Research, Development and Innovation Office, Hungary; the Department of Atomic Energy Government of India (DAE), the Department of Science and Technology, Government of India (DST), University Grants Commission, Government of India (UGC), and the Council of Scientific and Industrial Research (CSIR), India; the Indonesian Institute of Science, Indonesia; Centro Fermi—Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi and Istituto Nazionale di Fisica Nucleare (INFN), Italy; the Institute for Innovative Science and Technology, the Nagasaki Institute of Applied Science (IIST), Japan Society for the Promotion of Science (JSPS) KAKENHI, and the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT), 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; the Ministry of Science and Higher Education and National Science Centre, Poland; Korea Institute of Science and Technology Information and National Research Foundation of Korea (NRF), Republic of Korea; the Ministry of Education and Scientific Research, Institute of Atomic Physics and the Ministry of Research and Innovation and Institute of Atomic Physics, Romania; the Joint Institute for Nuclear Research (JINR), the Ministry of Education and Science of the Russian Federation, the National Research Centre Kurchatov Institute, the Russian Science Foundation and Russian Foundation for Basic Research, Russia; the Ministry of Education, Science, Research and Sport of the Slovak Republic, Slovakia; the National Research Foundation of South Africa, South Africa; the Swedish Research Council (VR) and the Knut & Alice Wallenberg Foundation (KAW), Sweden; the European Organization for Nuclear Research, Switzerland; the National Science and Technology Development Agency (NSDTA), Suranaree University of Technology (SUT), and Office of the Higher Education Commission under NRU project of Thailand, Thailand; the Turkish Atomic Energy Agency (TAEK), Turkey; the National Academy of Sciences of Ukraine, Ukraine; the Science and Technology Facilities Council (STFC), United Kingdom; and the National Science Foundation of the United States of America (NSF) and the United States Department of Energy, Office of Nuclear Physics (DOE NP), United States of America.

Publisher Copyright:
© 2020 CERN.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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