Электронный каталог

Статья

Ablikim, M.
Precision Measurement of the Decay *S*+*>p*g in the Process J/*q*>*S*+*S^-*- / M.Ablikim, O.Bakina, I.Boyko, G.Chelkov, D.Dedovich, I.Denysenko, P.Egorov, A.Guskov, Y.Nefedov, S.Pogodin, A.Sarantsev, A.Zhemchugov, [a.o.] // Physical Review Letters [Electronic resource]. – 2023. – Vol.130, No.21. – P.211901. – URL: https://doi.org/10.1103/PhysRevLett.130.211901. – Bibliogr.:3.

Using (10 087±44)×106 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±0.021stat±0.018syst)×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±0.056stat±0.020syst. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки