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Accès ouvert déclaré 2025 article

Unraveling the Structure of Λ Hyperons with Polarized Λ Λ ¯ Pairs

2Citations signalées, ce qui n’est pas une note de qualité
91Institutions déclarées
17Pays d’affiliation déclarés

Rattachement africain : cn, ru, se, de, it, pl, mn, us, tr, kr, gb, th, pk, cl, nl, in, cy. Niveau de preuve : code pays fourni par la source.

Le résumé fourni par la source

With data collected in a dedicated energy scan from 2.3864 up to 3.0800 GeV, the BESIII Collaboration provides the first complete energy-dependent measurements of the Λ electromagnetic form factors in the timelike region. By combining double-tag and single-tag events from the e^{+}e^{-}→ΛΛ[over ¯]→pπ^{-}p[over ¯]π^{+} reaction, we achieve a complete decomposition of the spin structure of the reaction at five energy points, with high statistical and systematic precision. Our data reveal that while the modulus of the ratio between the electric and magnetic form factor, R(q^{2})=|G_{E}(q^{2})/G_{M}(q^{2})|, remains fairly constant across the considered energy range, the relative phase ΔΦ(q^{2})=Φ_{E}(q^{2})-Φ_{M}(q^{2}) changes by more than 90° between 2.396 and 2.6544 GeV. Using a fit to our data based on dispersion relations, the complex form factor ratio is determined as a function of q^{2}, and the preferred solution has multiple zero-crossings in the complex plane. From the derivative of the ratio at q^{2}=0, the root-mean-squared charge radius of the Λ is obtained. The two most probable solutions yield a negative root-mean-squared charge radius, indicating an asymmetric charge distribution where the ds quark pair lies close to the center of the Λ hyperon.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.

Le contrôle bibliographique ouvert

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

Titre Crossref
Unraveling the Structure of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi mathvariant="normal">Λ</mml:mi> </mml:math> Hyperons with Polarized <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi mathvariant="normal">Λ</mml:mi> <mml:mover accent="true"> <mml:mrow> <mml:mi mathvariant="normal">Λ</mml:mi> </mml:mrow> <mml:mrow> <mml:mo stretchy="false">¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:math> Pairs
Date Crossref
04/11/2025
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 il ne compte pas comme une seconde source scientifique indépendante.

Les institutions déclarées

Institute of High Energy PhysicsSiberian Branch of the Russian Academy of SciencesBudker Institute of Nuclear PhysicsUppsala UniversityZhengzhou UniversityJohannes Gutenberg University MainzUniversity of TurinUniversity of Science and Technology of ChinaSoutheast UniversityJoint 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 GeosciencesSoochow UniversityHenan UniversityNorth China Electric Power UniversityNanjing UniversityTsinghua UniversityInstitute of Modern PhysicsJilin UniversityJilin Medical UniversityHunan UniversitySun Yat-sen UniversityChung-Ang UniversityFudan UniversityShandong 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 University BloomingtonIndiana UniversityUniversity of Hawaiʻi at MānoaUniversity of Hawaii SystemSuranaree University of TechnologySouth China Normal UniversityUniversity of the PunjabHangzhou Normal UniversityHuangshan UniversityUniversity of TarapacáUniversity of GroningenIndian Institute of Technology MadrasJustus-Liebig-Universität GießenLiaoning Normal UniversityQufu Normal UniversityRenmin University of ChinaHebei UniversityChina Center of Advanced Science and TechnologySichuan UniversityGuangxi Normal UniversityShanxi 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 PerugiaHunan Normal UniversityShanghai Jiao Tong UniversityNear East UniversityBeihang UniversityYantai UniversityUniversity of BristolShanxi Normal UniversityUniversity of Science and Technology Liaoning

Une affiliation ne permet pas de déduire la nationalité d’un auteur.

Les sujets associés

Quantum Chromodynamics and Particle InteractionsParticle physics theoretical and experimental studiesHigh-Energy Particle Collisions Research

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