Электронный каталог

Статья

Ablikim, M.
Observation of a Vector Charmoniumlike State at 4.7 GeV/c*2 and Search for Z&sub(cs) in e*+e*-*>K*+K*-J/*q / M.Ablikim, O.Bakina, I.Boyko, G.Chelkov, D.Dedovich, I.Denysenko, P.Egorov, A.Guskov, Y.Nefedov, A.Sarantsev, A.Zhemchugov, [a.o.] // Physical Review Letters [Electronic resource]. – 2023. – Vol.131, No.21. – P.211902. – URL: https://doi.org/10.1103/PhysRevLett.131.211902. – Bibliogr.:81.

Using data samples with an integrated luminosity of 5.85  fb&sup(−1) collected at center-of-mass energies from 4.61 to 4.95 GeV with the BESIII detector operating at the BEPCII storage ring, we measure the cross section for the process e*+e*-→K*+K*-J/ψ. A new resonance with a mass of M=4708&sup(+17)&sub(−15)±21  MeV/c*2 and a width of Γ=126&sup(+27)&sub(−23)±30  MeV is observed in the energy-dependent line shape of the e+e−→K+K−J/ψ cross section with a significance over 5σ. The K+J/ψ system is also investigated to search for charged charmoniumlike states, but no significant Z*+&sub(cs) states are observed. Upper limits on the Born cross sections for e*+e*-→K*-Z&sub(cs)(3985)*+/K*-Z&sub(cs)(4000)++c.c. with Z&sub(cs)(3985)±/Z&sub(cs)(4000)±→K±J/ψ are reported at 90% confidence levels. The ratio of branching fractions {[B(Z&sub(cs)(3985)+→K+J/ψ)]/B[Z&sub(cs)(3985)+→(¯D0D&sip(* +)&sub(s)+¯D*0D*+&sub(s))]} is measured to be less than 0.03 at 90% confidence level.



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