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Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton

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    SYSNO ASEP0523917
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleMeasurement of the mass difference and the binding energy of the hypertriton and antihypertriton
    Author(s) Adam, J. (US)
    Adamczyk, L. (PL)
    Adams, J. R. (US)
    Adkins, J. K. (US)
    Agakishiev, G. (RU)
    Bielčík, J. (CZ)
    Bielčíková, Jana (UJF-V) RID, ORCID, SAI
    Chaloupka, P. (CZ)
    Federič, Pavol (UJF-V) ORCID, SAI
    Holub, L. (CZ)
    Kocan, M. (CZ)
    Kosarzewski, L. K. (CZ)
    Kramárik, L. (CZ)
    Líčeník, Robert (UJF-V) ORCID, SAI
    Moravcová, Z. (CZ)
    Rusňák, Jan (UJF-V) RID, ORCID, SAI
    Šimko, Miroslav (UJF-V) ORCID, SAI
    Šumbera, Michal (UJF-V) RID, ORCID, SAI
    Vaněk, Jan (UJF-V) ORCID, SAI
    Number of authors358
    Source TitleNature Physics. - : Nature Publishing Group - ISSN 1745-2473
    Roč. 16, č. 4 (2020), s. 409-412
    Number of pages4 s.
    Publication formPrint - P
    Languageeng - English
    CountryGB - United Kingdom
    KeywordsSTAR collaboration ; heavy ion experiments
    Subject RIVBG - Nuclear, Atomic and Molecular Physics, Colliders
    OECD categoryNuclear physics
    R&D ProjectsLTT18002 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
    Research InfrastructureBNL-CZ II - 90109 - České vysoké učení technické v Praze
    Method of publishingLimited access
    Institutional supportUJF-V - RVO:61389005
    UT WOS000518737400002
    EID SCOPUS85081642646
    DOI10.1038/s41567-020-0799-7
    AnnotationAccording to the CPT theorem, which states that the combined operation of charge conjugation, parity transformation and time reversal must be conserved, particles and their antiparticles should have the same mass and lifetime but opposite charge and magnetic moment. Here, we test CPT symmetry in a nucleus containing a strange quark, more specifically in the hypertriton. This hypernucleus is the lightest one yet discovered and consists of a proton, a neutron and a Lambda hyperon. With data recorded by the STAR detector at the Relativistic Heavy Ion Collider, we measure the Lambda hyperon binding energy B Lambda for the hypertriton, and find that it differs from the widely used value and from predictions, where the hypertriton is treated as a weakly bound system. Our results place stringent constraints on the hyperon-nucleon interaction and have implications for understanding neutron star interiors, where strange matter may be present. A precise comparison of the masses of the hypertriton and the antihypertriton allows us to test CPT symmetry in a nucleus with strangeness, and we observe no deviation from the expected exact symmetry.
    WorkplaceNuclear Physics Institute
    ContactMarkéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
    Year of Publishing2021
    Electronic addresshttps://doi.org/10.1038/s41567-020-0799-7
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