Study of the Λ–Λ interaction with femtoscopy correlations in pp and p–Pb collisions at the LHC
Abstract
This work presents new constraints on the existence and the binding energy of a possible Λ–Λ bound state, the H-dibaryon, derived from Λ–Λ femtoscopic measurements by the ALICE collaboration. The results are obtained from a new measurement using the femtoscopy technique in (Figure presented.) collisions at s=13 TeV and p–Pb collisions at sNN=5.02 TeV, combined with previously published results from (Figure presented.) collisions at s=7 TeV. The Λ–Λ scattering parameter space, spanned by the inverse scattering length f0 −1 and the effective range d0, is constrained by comparing the measured Λ–Λ correlation function with calculations obtained within the Lednický model. The data are compatible with hypernuclei results and lattice computations, both predicting a shallow attractive interaction, and permit to test different theoretical approaches describing the Λ–Λ interaction. The region in the (f0 −1,d0) plane which would accommodate a Λ–Λ bound state is substantially restricted compared to previous studies. The binding energy of the possible Λ–Λ bound state is estimated within an effective-range expansion approach and is found to be BΛΛ=3.2−2.4 +1.6(stat)−1.0 +1.8(syst) MeV.
Main Author
Format
Articles
Research article
Published
2019
Series
Subjects
Publication in research information system
Publisher
Elsevier
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-201909064033Use this for linking
Review status
Peer reviewed
ISSN
0370-2693
DOI
https://doi.org/10.1016/j.physletb.2019.134822
Language
English
Published in
Physics Letters B
Citation
- ALICE Collaboration. (2019). Study of the Λ–Λ interaction with femtoscopy correlations in pp and p–Pb collisions at the LHC. Physics Letters B, 797, Article 134822. https://doi.org/10.1016/j.physletb.2019.134822
License
Additional information about funding
National Academy of Sciences of Ukraine
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Institut National de Physique Nucléaire et de Physique des Particules
Ministry of Science,Technology and Research
Bangladesh Council of Scientific and Industrial Research
Ministry of Science and Technology of the People's Republic of China
Science and Technology Research Partnership for Sustainable Development
CERN
Austrian Science Fund
Bundesministerium für Bildung und Forschung
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Ministry of Higher Education and Scientific Research
Consejo Nacional de Ciencia y Tecnología, Paraguay
Knut och Alice Wallenbergs Stiftelse
Office of the Higher Education Commission
Department of Science and Technology, Government of Kerala
Ministry of Education and Science of the Russian Federation
Science and Technology Facilities Council
Suranaree University of Technology
Istituto Nazionale di Fisica Nucleare
General Secretariat for Research and Technology
Japan Society for the Promotion of Science
Ministry of Science and Technology, Croatia
United States-Israel Binational Science Foundation
Conseil Régional des Pays de la Loire
Joint Institute for Nuclear Research
Österreichische Nationalstiftung für Forschung, Technologie und Entwicklung
Türkiye Atom Enerjisi Kurumu
National Sleep Foundation
Universidade Federal do Rio Grande do Sul
Korea Institute of Science and Technology Information
Ministry of Education, Culture, Sports, Science and Technology
Austrian Science Fund
National Kidney Foundation of South Africa
Danish Eye Research Foundation
Centre National de la Recherche Scientifique
Vetenskapsrådet
National Science and Technology Development Agency
National Natural Science Foundation of China
Institute for Critical Technology and Applied Science
Fondo de Cooperación Internacional en Ciencia y Tecnología
Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México
Istituto Nazionale di Fisica Nucleare
Conselho Nacional de Desenvolvimento Científico e Tecnológico
University Grants Commission - Sri Lanka
Department of Science and Technology, Ministry of Science and Technology
Fundação de Amparo à Pesquisa do Estado de São Paulo
See opportunities by FAPESP
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Lembaga Ilmu Pengetahuan Indonesia
Institut National de Physique Nucléaire et de Physique des Particules
Department of Atomic Energy, Government of India
Institute for Theoretical Atomic, Molecular and Optical Physics, Harvard University
Consejo Nacional de Ciencia y Tecnología
Financiadora de Estudos e Projetos
Ministry of Education of the People's Republic of China
International Atomic Energy Agency
Österreichischen Akademie der Wissenschaften
GSI Helmholtzzentrum für Schwerionenforschung GmbH
Ministry of Education, Culture, Sports, Science and Technology
Ministry of Education and Science
National Natural Science Foundation of China
Copyright© 2019 The Authors. Published by Elsevier B.V. T