Improved measurements of the Dalitz decays ?/?? ??e+e-

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dc.contributor.authorAblikim, M.
dc.contributor.authorAchasov, M.N.
dc.contributor.authorAdlarson, P.
dc.contributor.authorAfedulidis, O.
dc.contributor.authorAi, X.C.
dc.contributor.authorAliberti, R.
dc.contributor.authorÇetin, Serkant Ali
dc.date.accessioned2024-05-19T14:34:36Z
dc.date.available2024-05-19T14:34:36Z
dc.date.issued2024
dc.departmentİstinye Üniversitesien_US
dc.description.abstractBased on a data sample of 10 billion J/? events collected with the BESIII detector, improved measurements of the Dalitz decays ?/????e+e- are performed, where the ? and ?? are produced through the radiative decays J/????/??. The branching fractions of ???e+e- and ????e+e- are measured to be (7.07±0.05±0.23)×10-3 and (4.83±0.07±0.14)×10-4, respectively. Within the single-pole model, the parameter of electromagnetic transition form factor for ???e+e- is determined to be ??=(0.749±0.027±0.007) GeV/c2. Within the multipole model, we extract the electromagnetic transition form factors for ????e+e- to be ???=(0.802±0.007±0.008) GeV/c2 and ???=(0.113±0.010±0.002) GeV/c2. The results are consistent with both theoretical predictions and previous measurements. The characteristic sizes of the interaction regions for the ? and ?? are calculated to be (0.645±0.023±0.007) fm and (0.596±0.005±0.006) fm, respectively. In addition, we search for the dark photon in ?/????e+e-, and the upper limits of the branching fractions as a function of the dark photon are given at 90% confidence level. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.en_US
dc.description.sponsorshipShanghai Key Laboratory for Particle Physics and Cosmology, SKLPPC; Instituto Nazionale di Fisica Nucleare, INFN; Institute of Nuclear and Particle Physics, Shanghai Jiao Tong University, INPAC; Chinese Academy of Sciences, CAS; Vetenskapsrådet, VR; Key Project of Frontier Science Research of Chinese Academy of Sciences: QYZDJ-SSW-SLH003, QYZDJ-SSW-SLH040; Key Project of Frontier Science Research of Chinese Academy of Sciences; Narodowe Centrum Nauki, NCN: 2019/35/O/ST2/02907; Narodowe Centrum Nauki, NCN; Horizon 2020: 894790; Horizon 2020; B16F640076; National Research Foundation of Korea, NRF: NRF-2022R1A2C1092335; National Research Foundation of Korea, NRF; National Natural Science Foundation of China, NSFC: 11935015, 12192262, 12225509, 12235017, 11935016, 12035013, 12061131003, 11961141012, 12192261, 11635010, 12035009, 12025502, 11735014, 12192264, 12005195, 12192260, 12192263, 12221005, 11935018, 12192265, 11835012; National Natural Science Foundation of China, NSFC; Deutsche Forschungsgemeinschaft, DFG: GRK 2149, 455635585, CRC 1044, FOR5327; Deutsche Forschungsgemeinschaft, DFG; CAS Center for Excellence in Particle Physics, CCEPP: U1832207; CAS Center for Excellence in Particle Physics, CCEPP; National Key Research and Development Program of China, NKRDPC: 2020YFA0406300, 2020YFA0406400; National Key Research and Development Program of China, NKRDPC; U.S. Department of Energy, USDOE: DE-FG02-05ER41374; U.S. Department of Energy, USDOE; DPT2006K-120470en_US
dc.description.sponsorshipThe 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. 2020YFA0406300 and No. 2020YFA0406400; 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, and No. 12005195; 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 and 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's Horizon 2020 research and innovation program under Marie Skaodowska-Curie grant agreement under Contract No. 894790; German Research Foundation DFG under Contract No. 455635585, Collaborative Research Center Contract No. CRC 1044, No. FOR5327, and 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; and U.S. Department of Energy under Contract No. DE-FG02-05ER41374.en_US
dc.identifier.doi10.1103/PhysRevD.109.072001
dc.identifier.issn2470-0010
dc.identifier.issue7en_US
dc.identifier.scopus2-s2.0-85190639442en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1103/PhysRevD.109.072001
dc.identifier.urihttps://hdl.handle.net/20.500.12713/4519
dc.identifier.volume109en_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.ispartofPhysical Review Den_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.snmz20240519_kaen_US
dc.titleImproved measurements of the Dalitz decays ?/?? ??e+e-en_US
dc.typeArticleen_US

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