Search for the double Dalitz decays η / η ′ → e + e − μ + μ − and η ′ → μ + μ − μ + μ −

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Search for the double Dalitz decays η / η ′ → e + e − μ + μ − and η ′ → μ + μ − μ + μ −. / The BESIII Collaboration ; Ачасов, Михаил Николаевич ; Мучной, Николай Юрьевич и др.

в: Physical Review D, Том 111, № 5, 052002, 10.03.2025.

Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование

BibTeX

@article{abdfc4a75e7548249dc342b75ca5e290,

title = "Search for the double Dalitz decays η / η ′ → e + e − μ + μ − and η ′ → μ + μ − μ + μ −",

abstract = " Using a data sample of ( 10087 ± 44 ) × 10 6 J / ψ events collected with the BESIII detector, we search for the decays η / η ′ → e + e − μ + μ − and η ′ → μ + μ − μ + μ − via the radiative decays J / ψ → γ η / γ η ′ . No excess of events over expected background is observed for any of the decays of interest. At 90% confidence level, we report the first upper limits on the branching fractions of η ′ → e + e − μ + μ − and η ′ → μ + μ − μ + μ − to be 1.75 × 10 − 6 and 5.28 × 10 − 7 , respectively. In addition, we set an upper limit on the branching fraction of η → e + e − μ + μ − to be 6.88 × 10 − 6 , which improves the previous result by about two orders of magnitude. ",

author = "{BESIII Collaboration} and Ачасов, {Михаил Николаевич} and Мучной, {Николай Юрьевич} and Николаев, {Иван Борисович}",

note = "Search for the double Dalitz decays η/η′→e+e−μ+μ− and η′→μ+μ−μ+μ− / The BESIII Collaboration // Physical Review D. – 2025. – Vol. 111, No. 5. – P. 052002. – DOI 10.1103/physrevd.111.052002. 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. 2020YFA0406300, No. 2020YFA0406400, No. 2023YFA1606000; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11735014, No. 11935015, No. 11935016, No. 11935018, 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, No. 12361141819, No. 12275067; The Science and Technology R&D Program Joint Fund Project of Henan Province (Grant No. 225200810030) and the Science and Technology Innovation Leading Talent Support Program of Henan Province, and National Key R&D Program of China (Grant No. 2023YFA1606000); 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; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Contracts No. FOR5327, No. GRK 2149; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts No. 2021.0174, No. 2021.0299; 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 & Institutional Development, Research and Innovation of Thailand under Contracts No. B16F640076, No. B50G670107; Polish National Science Centre under Contract No. 2019/35/O/ST2/02907; Swedish Research Council under Contract No. 2019.04595; The Swedish Foundation for International Cooperation in Research and Higher Education under Contract No. CH2018-7756; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.",

year = "2025",

month = mar,

day = "10",

doi = "10.1103/physrevd.111.052002",

language = "English",

volume = "111",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "5",

}

RIS

TY - JOUR

T1 - Search for the double Dalitz decays η / η ′ → e + e − μ + μ − and η ′ → μ + μ − μ + μ −

AU - BESIII Collaboration

AU - Ачасов, Михаил Николаевич

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - Search for the double Dalitz decays η/η′→e+e−μ+μ− and η′→μ+μ−μ+μ− / The BESIII Collaboration // Physical Review D. – 2025. – Vol. 111, No. 5. – P. 052002. – DOI 10.1103/physrevd.111.052002. 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. 2020YFA0406300, No. 2020YFA0406400, No. 2023YFA1606000; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11735014, No. 11935015, No. 11935016, No. 11935018, 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, No. 12361141819, No. 12275067; The Science and Technology R&D Program Joint Fund Project of Henan Province (Grant No. 225200810030) and the Science and Technology Innovation Leading Talent Support Program of Henan Province, and National Key R&D Program of China (Grant No. 2023YFA1606000); 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; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Contracts No. FOR5327, No. GRK 2149; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts No. 2021.0174, No. 2021.0299; 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 & Institutional Development, Research and Innovation of Thailand under Contracts No. B16F640076, No. B50G670107; Polish National Science Centre under Contract No. 2019/35/O/ST2/02907; Swedish Research Council under Contract No. 2019.04595; The Swedish Foundation for International Cooperation in Research and Higher Education under Contract No. CH2018-7756; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.

PY - 2025/3/10

Y1 - 2025/3/10

N2 - Using a data sample of ( 10087 ± 44 ) × 10 6 J / ψ events collected with the BESIII detector, we search for the decays η / η ′ → e + e − μ + μ − and η ′ → μ + μ − μ + μ − via the radiative decays J / ψ → γ η / γ η ′ . No excess of events over expected background is observed for any of the decays of interest. At 90% confidence level, we report the first upper limits on the branching fractions of η ′ → e + e − μ + μ − and η ′ → μ + μ − μ + μ − to be 1.75 × 10 − 6 and 5.28 × 10 − 7 , respectively. In addition, we set an upper limit on the branching fraction of η → e + e − μ + μ − to be 6.88 × 10 − 6 , which improves the previous result by about two orders of magnitude.

AB - Using a data sample of ( 10087 ± 44 ) × 10 6 J / ψ events collected with the BESIII detector, we search for the decays η / η ′ → e + e − μ + μ − and η ′ → μ + μ − μ + μ − via the radiative decays J / ψ → γ η / γ η ′ . No excess of events over expected background is observed for any of the decays of interest. At 90% confidence level, we report the first upper limits on the branching fractions of η ′ → e + e − μ + μ − and η ′ → μ + μ − μ + μ − to be 1.75 × 10 − 6 and 5.28 × 10 − 7 , respectively. In addition, we set an upper limit on the branching fraction of η → e + e − μ + μ − to be 6.88 × 10 − 6 , which improves the previous result by about two orders of magnitude.

UR - https://www.scopus.com/pages/publications/105037515145

UR - https://elibrary.ru/item.asp?id=81933750

UR - https://www.mendeley.com/catalogue/c76c9603-6ec7-305f-8ba5-369802a49704/

U2 - 10.1103/physrevd.111.052002

DO - 10.1103/physrevd.111.052002

M3 - Article

VL - 111

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 5

M1 - 052002

ER -

ID: 71514952