Электронный каталог

Статья

Ablikim, M.
Observation of the Decay J/*q*>e*+e*-*h(1405) with *h(1405)*>*p*0f&sub(0)(980) / 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]. – 2024. – Vol. 109, No. 1. – P. 012007. – URL: https://doi.org/10.1103/PhysRevD.109.012007. – Bibliogr.: 51.

Using a data sample of (10087±44)×106  J/ψ events collected by the BESIII detector in 2009, 2012, 2018 and 2019, the electromagnetic Dalitz process J/ψ→e+e−η(1405) is observed via the decay η(1405)→π0f0(980), f0(980)→π+π−, with a significance of about 9.8σ. The branching fraction of this decay is measured to be B(J/ψ→e+e−η(1405)→e+e−π0f0(980)→e+e−π0π+π−)=(2.04±0.20(stat)±0.08(syst))×10−7. The branching fraction ratio B(J/ψ→e+e−η(1405))/B(J/ψ→γη(1405)) is determined to be (1.36±0.17(stat)±0.06(syst))×10−2. Furthermore, an e+e− invariant mass dependent transition form factor of J/ψ→e+e−η(1405) is presented for the first time. The obtained result provides input for different theoretical models and is valuable for the improved understanding the intrinsic structure of the η(1405) meson.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки