Cross section measurements of e(+)e(-) -> K+ K- K+ K- and phi K+ K- at center-of-mass energies from 2.10 to 3.08 GeV
Künye
Ablikim, M. (2021). BESIII. Observation of a Charged Charmoniumlike Structure in e+e−→ π+ π− J/ψ at√ s, 4.Özet
We measure the Born cross sections of the process e(+)e(-) -> K+ K- K+ K- at center-of-mass (c.m.) energies, root s, between 2.100 and 3.080 GeV. The data were collected using the BESIII detector at the BEPCII collider. An enhancement at root s = 2.232 GeV is observed, very close to the e(+)e(-) -> Lambda(Lambda) over bar production threshold. A similar enhancement at the same c.m. energy is observed in the e(+)e(-) -> phi K+ K- cross section. The energy dependence of the K+ K- K+ K- and phi K+ K- cross sections differs significantly from that of e(+)e(-) -> phi pi(+)pi(-).
