Speaker
Description
This talk will present three recent studies conducted using data samples collected by the BESIII detector at center-of-mass energies ranging from 3.51 to 4.95 GeV. The investigations encompass hidden-charm, open-charm, and baryon final states. Specifically, the studies include the following: 1) Investigation of e+ e- -> K+ K- psi(2S), measuring the Born cross-sections and searching for new tetraquark candidates Z±cs in the decays Z±cs→K±ψ(2S); 2) Exploration of e+e−→D+sDs1(2536)− and e+e−→D+sD∗s2(2573)−, which reveals absolute branching fractions of Ds1(2536)−→D*0barK− and D∗s2(2573)−→D0barK− that challenge predictions based on the assumption of the Ds1(2536) and D∗s2(2573) being dominated by a bare csbar component, along with the discovery of intriguing resonant structures in the cross-section line shapes; 3) Examination of e+e- -> K Xi Lambda (Sigma), where the Born cross-sections are measured, and the first evidence of ψ(4160)→K−Ξ¯+Λ is observed.
