Measurement of the hyperon weak radiative decay Ξ0 → γΣ0 at BESIII

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Measurement of the hyperon weak radiative decay Ξ0 → γΣ0 at BESIII. / BESIII Collaboration ; Ачасов, Михаил Николаевич ; Мучной, Николай Юрьевич et al.

In: Journal of High Energy Physics, Vol. 2026, No. 8, 17, 05.08.2026.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{4e9a16a008f942629eb02b0aac9610c4,

title = "Measurement of the hyperon weak radiative decay Ξ0 → γΣ0 at BESIII",

abstract = "The hyperon weak radiative decay Ξ0 → γΣ0is measured using a sample of Ξ0from J/ψ → Ξ0Ξ¯0 decays. The absolute branching fraction of Ξ0 → γΣ0 is determined to be (3.66 ± 0.21stat ± 0.10syst) × 10−3, based on (10.087 ± 0.044) × 109 J/ψ events collected with the BESIII detector operating at the BEPCII collider. The decay asymmetry parameter is measured, with a complete angular analysis of the cascade decay chain, to be αγ = −0.807 ± 0.095stat ± 0.011syst.",

keywords = "Branching fraction, Electroweak Interaction, e +-e − Experiments",

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

note = "The BESIII Collaboration thanks the staff of BEPCII (https://cstr.cn/31109.02.BEPC) and the IHEP computing center for their strong support and the supercomputing center of USTC for their strong support. This work is supported in part by National Key R&D Program of China under Contracts Nos. 2023YFA1609400, 2023YFA1606000, 2023YFA1606704; National Natural Science Foundation of China (NSFC) under Contracts Nos. 11635010, 11935015, 11935016, 11935018, 12025502, 12035009, 12035013, 12061131003, 12105276, 12122509, 12192260, 12192261, 12192262, 12192263, 12192264, 12192265, 12221005, 12225509, 12235017, 12361141819; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS under Contract No. YSBR-101;Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts Nos. U2032111; 100 Talents Program of CAS; CAS Youth Team Program under Contract No. YSBR-101; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; Agencia Nacional de Investigaci{\'o}n y Desarrollo de Chile (ANID), Chile under Contract No. ANID PIA/APOYO AFB230003; German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts Nos. 2021.0174, 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; Polish National Science Centre under Contract No. 2024/53/B/ST2/00975; Swedish Research Council under Contract No. 2019.04595; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.",

year = "2026",

month = aug,

day = "5",

doi = "10.1007/JHEP08(2026)017",

language = "English",

volume = "2026",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

publisher = "Springer US",

number = "8",

}

RIS

TY - JOUR

T1 - Measurement of the hyperon weak radiative decay Ξ0 → γΣ0 at BESIII

AU - BESIII Collaboration

AU - Ачасов, Михаил Николаевич

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - The BESIII Collaboration thanks the staff of BEPCII (https://cstr.cn/31109.02.BEPC) and the IHEP computing center for their strong support and the supercomputing center of USTC for their strong support. This work is supported in part by National Key R&D Program of China under Contracts Nos. 2023YFA1609400, 2023YFA1606000, 2023YFA1606704; National Natural Science Foundation of China (NSFC) under Contracts Nos. 11635010, 11935015, 11935016, 11935018, 12025502, 12035009, 12035013, 12061131003, 12105276, 12122509, 12192260, 12192261, 12192262, 12192263, 12192264, 12192265, 12221005, 12225509, 12235017, 12361141819; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS under Contract No. YSBR-101;Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts Nos. U2032111; 100 Talents Program of CAS; CAS Youth Team Program under Contract No. YSBR-101; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; Agencia Nacional de Investigación y Desarrollo de Chile (ANID), Chile under Contract No. ANID PIA/APOYO AFB230003; German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts Nos. 2021.0174, 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; Polish National Science Centre under Contract No. 2024/53/B/ST2/00975; Swedish Research Council under Contract No. 2019.04595; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.

PY - 2026/8/5

Y1 - 2026/8/5

N2 - The hyperon weak radiative decay Ξ0 → γΣ0is measured using a sample of Ξ0from J/ψ → Ξ0Ξ¯0 decays. The absolute branching fraction of Ξ0 → γΣ0 is determined to be (3.66 ± 0.21stat ± 0.10syst) × 10−3, based on (10.087 ± 0.044) × 109 J/ψ events collected with the BESIII detector operating at the BEPCII collider. The decay asymmetry parameter is measured, with a complete angular analysis of the cascade decay chain, to be αγ = −0.807 ± 0.095stat ± 0.011syst.

AB - The hyperon weak radiative decay Ξ0 → γΣ0is measured using a sample of Ξ0from J/ψ → Ξ0Ξ¯0 decays. The absolute branching fraction of Ξ0 → γΣ0 is determined to be (3.66 ± 0.21stat ± 0.10syst) × 10−3, based on (10.087 ± 0.044) × 109 J/ψ events collected with the BESIII detector operating at the BEPCII collider. The decay asymmetry parameter is measured, with a complete angular analysis of the cascade decay chain, to be αγ = −0.807 ± 0.095stat ± 0.011syst.

KW - Branching fraction

KW - Electroweak Interaction

KW - e +-e − Experiments

UR - https://www.scopus.com/pages/publications/105047963520

U2 - 10.1007/JHEP08(2026)017

DO - 10.1007/JHEP08(2026)017

M3 - Article

VL - 2026

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 8

M1 - 17

ER -

ID: 83280832