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Accès ouvert déclaré 2026 article

Observation of the Electromagnetic Radiative Decays of the Λ ( 1520 ) and Λ ( 1690 ) to γ Σ 0

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83Institutions déclarées
16Pays d’affiliation déclarés

Résumé fourni par la source

Using (10087±44)×10^{6} J/ψ events collected with the BESIII detector, we present a study of resonant structures in the J/ψ→ΛΛ[over ¯]γ and ΛΣ[over ¯]^{0}γ processes, reporting the first observation of the electromagnetic radiative decays of the Λ(1520) and Λ(1690) to γΣ^{0}, with a statistical significance of 16.6σ and 23.2σ, respectively. The ratio of the branching fractions {B[Λ(1520)→γΛ]/B[Λ(1520)→γΣ^{0}]} is determined to be 3.19±0.34(stat)±0.19(syst), which is in agreement with flavor SU(3) symmetry within two standard deviations. The branching fraction of Λ(1520)→γΣ^{0} is measured to be B[Λ(1520)→γΣ^{0}]=[2.66±0.28(stat)±0.50(syst)]×10^{-3}, corresponding to a partial width of Γ[Λ(1520)→γΣ^{0}]=[46.8±6.6(stat)±9.3(syst)] keV, which is inconsistent with predictions from the relativized constituent quark model and the Algebraic model. Additionally, we observe a clear resonant structure in the γΣ^{0} mass spectrum near 1.7 GeV/c^{2}, attributed to the Λ(1690). The product branching fraction B[J/ψ→Λ[over ¯]Λ(1690)+c.c.]×B[Λ(1690)→γΣ^{0}] is measured for the first time as [6.05±0.42(stat)±0.39(syst)]×10^{-6}. However, no corresponding structure is seen in the γΛ mass spectrum, so an upper limit on the product branching fraction B[J/ψ→Λ[over ¯]Λ(1690)+c.c.]×B[Λ(1690)→γΛ] is determined to be 5.08×10^{-7} at the 90% confidence level.

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Contrôle bibliographique ouvert

DOI retrouvé dans Crossref DOI retrouvé, mais le titre doit être comparé manuellement.

Titre Crossref
Observation of the Electromagnetic Radiative Decays of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi mathvariant="normal">Λ</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mn>1520</mml:mn> <mml:mo stretchy="false">)</mml:mo> </mml:mrow> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi mathvariant="normal">Λ</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mn>1690</mml:mn> <mml:mo stretchy="false">)</mml:mo> </mml:mrow> </mml:math> to <mml:math xmlns:mml="http:
Date Crossref
08/04/2026
Éditeur
American Physical Society (APS)
Type
journal-article

Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude et ne compte pas comme une seconde source scientifique indépendante.

Institutions déclarées

Budker Institute of Nuclear PhysicsUppsala UniversityZhengzhou UniversityJohannes Gutenberg University MainzUniversity of TurinUniversity of Science and Technology of ChinaJoint Institute for Nuclear ResearchPeking UniversityUniversity of Chinese Academy of SciencesNational Centre for Nuclear ResearchMongolian Academy of SciencesIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di FrascatiIstituto Nazionale di Fisica Nucleare, Sezione di FerraraCarnegie Mellon UniversityUniversity of MünsterWuhan UniversityLanzhou UniversityIstinye UniversityNankai UniversityChina University of GeosciencesHenan UniversityNorth China Electric Power UniversityNanjing UniversityTsinghua UniversityFudan UniversityInstitute of Modern PhysicsGuangxi University of Science and TechnologyJilin UniversityJilin Medical UniversityHunan UniversityHunan Normal UniversityChung-Ang UniversityUniversity of BristolShandong UniversityYunnan UniversityHelmholtz Institute MainzRuhr University BochumUniversity of South ChinaUniversity of JinanLiaoning UniversityInner Mongolia UniversityHenan Normal UniversityUniversità degli Studi del Piemonte Orientale “Amedeo Avogadro”Piedmont UniversityNanjing Normal UniversityUniversity of FerraraUniversity of ManchesterUniversity of OxfordGSI Helmholtz Centre for Heavy Ion ResearchGuangxi UniversityShandong Normal UniversityIndiana UniversityUniversity of Hawaii SystemSuranaree University of TechnologySouth China Normal UniversityUniversity of the PunjabHangzhou Normal UniversityHuangshan UniversityUniversity of TarapacáUniversity of GroningenJustus-Liebig-Universität GießenLiaoning Normal UniversityQufu Normal UniversityRenmin University of ChinaHebei UniversityChina Center of Advanced Science and TechnologySichuan UniversityGuangxi Normal UniversityCentral China Normal UniversityShanxi University of Traditional Chinese MedicineHenan University of Science and TechnologyHenan University of TechnologyCentral South UniversityZhejiang UniversityCOMSATS University IslamabadUniversity of PerugiaIstituto Nazionale di Fisica Nucleare, Sezione di PerugiaShanghai Jiao Tong UniversityNear East UniversityBeihang UniversityYantai UniversityShanxi Normal UniversityUniversity of Science and Technology Liaoning

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