Observation of Λc+ → Λa0 (980)+ and Evidence for ς (1380)+ in Λc+ → Λπ+η

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dc.authorscopusidSerkant Ali Çetin / 34567544400
dc.authorscopusidOnur Buğra Kolcu / 57936993500
dc.authorscopusidIgor Uman / 57197897066
dc.authorwosidSerkant Ali Çetin / AGF-0147-2022
dc.authorwosidOnur Buğra Kolcu / P-4990-2015
dc.authorwosidIgor Uman / GGS-3325-2022
dc.contributor.authorAblikim, M.
dc.contributor.authorAchasov, M.N.
dc.contributor.authorAdlarson, P.
dc.contributor.authorÇetin, Serkant Ali
dc.contributor.authorKolcu, Onur Buğra
dc.contributor.authorUman, Igor
dc.date.accessioned2025-04-18T10:09:06Z
dc.date.available2025-04-18T10:09:06Z
dc.date.issued2025
dc.departmentİstinye Üniversitesi, Rektörlük, Temel Bilimler Bölümü
dc.description.abstractBased on 6.1 fb-1 of e+e- annihilation data collected at center-of-mass energies from 4.600 to 4.843 GeV with the BESIII detector at the BEPCII collider, a partial wave analysis of Λc+→Λπ+η is performed, and branching fractions and decay asymmetry parameters of intermediate processes are determined. The process Λc+→Λa0(980)+ is observed for the first time, and evidence for the pentaquark candidate ς(1380)+ decaying into Λπ+ is found with statistical significance larger than 3σ with mass and width fixed to theoretical predictions. The branching fraction product B[Λc+→Λa0(980)+]B[a0(980)+→π+η] is determined to be (1.05±0.16stat±0.05syst±0.07ext)%, which is larger than theoretical calculations by 1-2 orders of magnitude. Here the third (external) systematic is from B(Λc+→Λπ+η). Finally, we precisely obtain the absolute branching fraction B(Λc+→Λπ+η)=(1.94±0.07stat±0.11syst)%. © 2025 authors. Published by the American Physical Society.
dc.description.sponsorshipWe thank En Wang, Guan-Ying Wang, Yu-Kuo Hsiao, and Jia-Jun Wu for useful discussions. The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center for their strong support. This work is supported in part by National Key R&D Program of China under Contracts No. 2020YFA0406400, No. 2020YFA0406300, No. 2023YFA1606000; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11735014, No. 11835012, No. 11935015, No. 11935016, No. 11935018, No. 11961141012, No. 12025502, No. 12035009, No. 12035013, No. 12061131003, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12221005, No. 12225509, No. 12235017; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contract No. U1832207; CAS Key Research Program of Frontier Sciences under Contracts No. QYZDJ-SSW-SLH003, No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; European Union\u2019s Horizon 2020 research and innovation program under Marie Sklodowska-Curie grant agreement under Contract No. 894790; German Research Foundation DFG under Contracts No. 455635585, Collaborative Research Center CRC 1044, No. FOR5327, No. GRK 2149; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Research Foundation of Korea under Contract No. NRF-2022R1A2C1092335; National Science and Technology fund of Mongolia; National Science Research and Innovation Fund (NSRF) via the Program Management Unit for Human Resources and Institutional Development, Research and Innovation of Thailand under Contract No. B16F640076; Polish National Science Centre under Contract No. 2019/35/O/ST2/02907; The Swedish Research Council; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.
dc.identifier.citationAblikim, M., Achasov, M. N., Adlarson, P., Afedulidis, O., Ai, X. C., Aliberti, R., ... & Huang, K. X. (2025). Observation of Λ c+→ Λ a 0 (980)+ and Evidence for Σ (1380)+ in Λ c+→ Λ π+ η. Physical Review Letters, 134(2), 021901.
dc.identifier.doi10.1103/PhysRevLett.134.021901
dc.identifier.issn00319007
dc.identifier.issue2
dc.identifier.pmid39913812
dc.identifier.scopus2-s2.0-85215947894
dc.identifier.scopusqualityQ1
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevLett.134.021901
dc.identifier.urihttps://hdl.handle.net/20.500.12713/6962
dc.identifier.volume134
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.institutionauthorÇetin, Serkant Ali
dc.institutionauthorKolcu, Onur Buğra
dc.institutionauthorUman, Igor
dc.institutionauthoridSerkant Ali Çetin / 0000-0001-5050-8441
dc.institutionauthoridOnur Buğra Kolcu / 0000-0002-9177-1286
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.ispartofPhysical Review Letters
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectAsymmetry Parameter
dc.subjectBranching Fractions
dc.subjectCenter-of-mass Energies
dc.subjectStatistical Significance
dc.subjectTheoretical Calculations
dc.subjectCenE+e- Annihilation
dc.titleObservation of Λc+ → Λa0 (980)+ and Evidence for ς (1380)+ in Λc+ → Λπ+η
dc.typeArticle

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