Observation of the Y(4230) and a new structure in e(+)e(-) -> K+ K- J/psi
Yükleniyor...
Tarih
2022
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IOP Publishing Ltd
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The cross sections of e(+)e(-) -> K+K- J/psi at center-of-mass energies from 4.127 to 4.600 GeV are measured based on 15.6 fb(-1) data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in the line shape of the cross sections. The mass and width of the first structure are measured to be (4225.3 +/- 2.3 +/- 21.5) MeV and (72.9 +/- 6.1 +/- 30.8) MeV, respectively. They are consistent with those of the established Y(4230). The second structure is observed for the first time with a statistical significance greater than 8 sigma, denoted as Y(4500). Its mass and width are determined to be (4484.7 +/- 13.3 +/- 24.1) MeV and (111.1 +/- 30.1 +/- 15.2) MeV, respectively. The first presented uncertainties are statistical and the second ones are systematic. The product of the electronic partial width with the decay branching fraction Gamma(Y(4230) -> e(+)e(-))B(Y(4230) -> K+ K- J/psi) is reported.
Açıklama
Anahtar Kelimeler
Y States, Charmonium-Like States, BESIII
Kaynak
CHINESE PHYSICS C
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
46
Sayı
11
Künye
Yu, G. (2022). Observation of the $ y (4230) $ and a new structure in $ e^+ e^-\rightarrow K^+ K^-J/\psi$. Chinese physics C.
