TY - JOUR

T1 - Measurements of branching fractions of Λ+c → Σ0K0Sπ+ and Λ+c → Σ0K0SK+

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. Measurements of branching fractions of Λ+c → Σ0K0Sπ+ and Λ+c → Σ0K0SK+. J. High Energ. Phys. 2026, 9 (2026). https://doi.org/10.1007/JHEP06(2026)009 We thank Y. K. Hsiao for useful discussions. 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, 2023YFA1609400; National Natural Science Foundation of China (NSFC) under Contracts Nos. 12305105, 12205141, 12105127, 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; Natural Science Foundation of Shandong Province under Grants No. ZR2023QA119; 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 - 2026/6/1

Y1 - 2026/6/1

N2 - Based on a data sample corresponding to an integrated luminosity of 6.4 fb−1of e+e− annihilation and collected with the BESIII detector at 13 center-of-mass energy points ranging between 4.600 GeV and 4.950 GeV, we report the first observation of the singly Cabibbo-suppressed decay Λ+c → Σ0K0Sπ+ with a statistical significance of 5.9σ. The branching fraction is determined to be B(Λ+c → Σ0K0Sπ+) = (0.58±0.14stat.±0.04syst.)×10−3. In addition, the decay Λ+c → Σ0K0SK+ has also been investigated, and the evidence for this decay is obtained with a statistical significance of 3.7σ.

AB - Based on a data sample corresponding to an integrated luminosity of 6.4 fb−1of e+e− annihilation and collected with the BESIII detector at 13 center-of-mass energy points ranging between 4.600 GeV and 4.950 GeV, we report the first observation of the singly Cabibbo-suppressed decay Λ+c → Σ0K0Sπ+ with a statistical significance of 5.9σ. The branching fraction is determined to be B(Λ+c → Σ0K0Sπ+) = (0.58±0.14stat.±0.04syst.)×10−3. In addition, the decay Λ+c → Σ0K0SK+ has also been investigated, and the evidence for this decay is obtained with a statistical significance of 3.7σ.

KW - e +-e − Experiments

KW - Charm Physics

KW - Branching fraction

KW - Flavour Physics

UR - https://www.scopus.com/pages/publications/105041465494

U2 - 10.1007/JHEP06(2026)009

DO - 10.1007/JHEP06(2026)009

M3 - Article

VL - 2026

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 6

M1 - 9

ER -