Research output: Contribution to journal › Article › peer-review
Precision Measurement of the Decay Σ^{+}→pγ in the Process J/ψ→Σ^{+}Σ[over ¯]^{-}. / BESIII Collaboration ; Мучной, Николай Юрьевич.
In: Physical Review Letters, Vol. 130, No. 21, 26.05.2023, p. 211901.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Precision Measurement of the Decay Σ^{+}→pγ in the Process J/ψ→Σ^{+}Σ[over ¯]^{-}
AU - BESIII Collaboration
AU - Achasov, M N
AU - Chen, S J
AU - Nikolaev, I B
AU - Мучной, Николай Юрьевич
N1 - Precision Measurement of the Decay Σ+→pγ in the Process J/ψ→Σ+Σ¯− / BESIII Collaboration // Physical Review Letters. – 2023. – Vol. 130, No. 21. – P. 211901. – DOI 10.1103/physrevlett.130.211901.
PY - 2023/5/26
Y1 - 2023/5/26
N2 - Using (10 087±44)×10^{6} J/ψ events collected with the BESIII detector, the radiative hyperon decay Σ^{+}→pγ is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be (0.996±0.021_{stat}±0.018_{syst})×10^{-3}, which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be -0.652±0.056_{stat}±0.020_{syst}. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.
AB - Using (10 087±44)×10^{6} J/ψ events collected with the BESIII detector, the radiative hyperon decay Σ^{+}→pγ is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be (0.996±0.021_{stat}±0.018_{syst})×10^{-3}, which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be -0.652±0.056_{stat}±0.020_{syst}. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.
UR - https://pubmed.ncbi.nlm.nih.gov/37295102/
UR - https://www.elibrary.ru/item.asp?id=61463737
U2 - 10.1103/PhysRevLett.130.211901
DO - 10.1103/PhysRevLett.130.211901
M3 - Article
C2 - 37295102
VL - 130
SP - 211901
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 21
ER -
ID: 68339671