Электронный каталог

Статья

Ablikim, M.
Improved Measurement of the Branching Fractions for J/*q*>*g*p*0, *g*h, and *g*h' / 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.108, No.9. – P.092002. – URL: https://doi.org/10.1103/PhysRevD.108.092002. – Bibliogr.:42.

Using a data sample of (1.0087±0.0044)×1010  J/ψ events collected with the BESIII detector, the decays of J/ψ→γπ0(η,η′)→γγγ are studied. Newly measured branching fractions are B(J/ψ→γπ0)=(3.34±0.02±0.09)×10−5, B(J/ψ→γη)=(1.096±0.001±0.019)×10−3, and B(J/ψ→γη′)=(5.40±0.01±0.11)×10−3, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world average values within two standard deviations. The ratio of partial widths Γ(J/ψ→γη′)/Γ(J/ψ→γη) is measured to be 4.93±0.13. The singlet-octet pseudoscalar mixing angle θP is determined to be θP=−(22.11±0.26)° or −(19.34±0.34)° with two different phenomenological models.



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