Электронный каталог

Статья

Ablikim, M.
Observation of the Y(4230) and Evidence for a New Vector Charmoniumlike State Y(4710) in e*+e*-*>K*0&sub(S)K*0&sub(S)J/*q / 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.9. – P.092005. – URL: https://doi.org/10.1103/PhysRevD.107.092005. – Bibliogr.:60.

Cross sections for the process e+e−→K0SK0SJ/ψ at center-of-mass energies from 4.128 to 4.950 GeV are measured using data samples with a total integrated luminosity of 21.2  fb−1 collected by the BESIII detector operating at the BEPCII storage ring. The Y(4230) state is observed in the energy dependence of the e+e−→K0SK0SJ/ψ cross section for the first time with a statistical significance of 26.0σ. In addition, an enhancement around 4.710 GeV, labeled as the Y(4710), is seen with a statistical significance of 4.2σ. There is no clear structure around 4.484 GeV. Using a fit with a coherent sum of three Breit-Wigner functions, we determine the mass and width of the Y(4230) state to be 4226.9±6.6±22.0  MeV/c2 and 71.7±16.2±32.8  MeV, respectively, and the mass and width of the Y(4710) state to be 4704.0±52.3±69.5  MeV/c2 and 183.2±114.0±96.1  MeV, respectively, where the first uncertainties are statistical and the second are systematic. In addition, the average Born cross section ratio σBorn(e+e−→K0SK0SJ/ψ)σBorn(e+e−→K+K−J/ψ) is measured to be 0.388+0.035−0.028±0.016, or 0.426+0.038−0.031±0.018 if three-body phase space is considered.



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 = 44/023