Электронный каталог

Статья

Ablikim, M.
First Direct Measurement of the Absolute Branching Fraction *S*+ *> *Le*+*n&sub(e) / 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 D [Electronic resource]. – 2023. – Vol.107, No.7. – P.072010. – URL: https://doi.org/10.1103/PhysRevD.107.072010. – Bibliogr.:38.

The first direct measurement of the absolute branching fraction of Σ+→Λe+νe is reported based on an e+e− annihilation sample of (10087±44)×106   J/ψ events collected with the BESIII detector at √s=3.097  GeV. The branching fraction is determined to be B(Σ+→Λe+νe)=[2.93±0.74(stat)±0.13(syst)]×10−5, which is the most precise measurement obtained in a single experiment to date and also the first result obtained at a collider experiment. Combining this result with the world average of B(Σ−→Λe−¯νe) and the lifetimes of Σ±, the ratio, Γ(Σ−→Λe−¯νe)Γ(Σ+→Λe+νe), is determined to be 1.06±0.28, which is within 1.8 standard deviations of the value expected in the absence of second-class currents.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки
Спец.(статьи,препринты) = С 346.6д1 - Чармоний, боттомоний, топ-кварк. Очарованные частицы и др. резонансы из тяжелых кварков
Бюллетени = 43/023