Amplitude analysis of $$ \psi (3686)\to \gamma {K}_S^0{K}_S^0 $$

A bstract Using (2712 ± 14) × 10 6 ψ (3686) events collected with the BESIII detector, we perform the first amplitude analysis of the radiative decay $$ \psi (3686)\to \gamma {K}_S^0{K}_S^0 $$ ψ 3686 → γ K S 0 K S 0 within the mass region $$ {M}_{K_S^0{K}_S^0}<2.8 $$ M K S 0 K S 0 < 2.8 GeV/ c 2 . Employing a one-channel K-matrix approach for the description of the dynamics of the $$ {K}_S^0{K}_S^0 $$ K S 0 K S 0 system, the data sample is well described with four poles for the f 0 -wave and three poles for the f 2 -wave. The determined pole positions are consistent with those of well-established resonance states. The observed f 0 and f 2 states are found to be in agreement with those produced in radiative J/ψ decays. The production behaviors of f 0 and f 2 poles in $$ \psi (3686)\to \gamma {K}_S^0{K}_S^0 $$ ψ 3686 → γ K S 0 K S 0 are qualified with their residues and the converted branching fractions. By comparing with $$ J/\psi \to \gamma {K}_S^0{K}_S^0 $$ J / ψ → γ K S 0 K S 0 decay, the ratios $$ \frac{\mathcal{B}\left(\psi (3686)\to \gamma {f}_{0,2}\right)}{\mathcal{B}\left(J/\psi \to \gamma {f}_{0,2}\right)} $$ B ψ 3686 → γ f 0 , 2 B J / ψ → γ f 0 , 2 are determined, which provides crucial experimental inputs on the internal structure of the f 0 , 2

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.