Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Search for a massless particle beyond the Standard Model in the Ξ0 → Λ + invisible decay. / The BESIII Collaboration ; Ачасов, Михаил Николаевич; Мучной, Николай Юрьевич и др.
в: Journal of High Energy Physics, Том 2026, № 5, 73, 08.05.2026.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Search for a massless particle beyond the Standard Model in the Ξ0 → Λ + invisible decay
AU - BESIII Collaboration
AU - Ачасов, Михаил Николаевич
AU - Мучной, Николай Юрьевич
AU - Николаев, Иван Борисович
N1 - The BESIII collaboration., Ablikim, M., Achasov, M.N. et al. Search for a massless particle beyond the Standard Model in the Ξ0 → Λ + invisible decay. J. High Energ. Phys. 2026, 73 (2026). https://doi.org/10.1007/JHEP05(2026)073 The BESIII Collaboration thanks the staff of BEPCII (https://cstr.cn/31109.02.BEPC) 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 Nos. 2023YFA1606000, 2023YFA1606704; National Natural Science Foundation of China (NSFC) under Contracts Nos. 11635010, 11935015, 11935016, 11935018, 12025502, 12035009, 12035013, 12061131003, 12192260, 12192261, 12192262, 12192263, 12192264, 12192265, 12221005, 12225509, 12235017, 12342502, 12361141819; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the Strategic Priority Research Program of Chinese Academy of Sciences under Contract No. XDA0480600; CAS under Contract No. YSBR-101; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; 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, 2023.0315; 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; STFC (United Kingdom); Swedish Research Council under Contract No. 2019.04595; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.
PY - 2026/5/8
Y1 - 2026/5/8
N2 - A search for a massless beyond-standard-model particle is performed in the decay Ξ0 → Λ + invisible using (1.0087 ± 0.0044) × 1010 J/ψ events collected with the BESIII detector at the BEPCII collider. No significant signal is observed and the upper limit on the branching fraction ℬ(Ξ0 → Λ + invisible) is set to be 2.3 × 10−4 at the 90% confidence level. This is the first search for a flavor-changing neutral current process with missing energy in Ξ0 decays. Throughout this paper, charge-conjugate processes are always implied.
AB - A search for a massless beyond-standard-model particle is performed in the decay Ξ0 → Λ + invisible using (1.0087 ± 0.0044) × 1010 J/ψ events collected with the BESIII detector at the BEPCII collider. No significant signal is observed and the upper limit on the branching fraction ℬ(Ξ0 → Λ + invisible) is set to be 2.3 × 10−4 at the 90% confidence level. This is the first search for a flavor-changing neutral current process with missing energy in Ξ0 decays. Throughout this paper, charge-conjugate processes are always implied.
KW - e +-e − Experiments
KW - Dark Matter
KW - Branching fraction
UR - https://www.scopus.com/pages/publications/105039876095
U2 - 10.1007/JHEP05(2026)073
DO - 10.1007/JHEP05(2026)073
M3 - Article
VL - 2026
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1029-8479
IS - 5
M1 - 73
ER -
ID: 80208994