Common origin of the Belle-BESIII line-shape difference of $Λ_c^+\barΛ_c^-$, $D_s D_{s1}$ and $D_s D_{s2}^*$ from $e^+ e^-$ annihilation

The longstanding Belle--BESIII discrepancies in the $e^+e^-\toΛ_c^+\barΛ_c^-$, $D_sD_{s1}(2536)$, and $D_sD_{s2}^{*}(2573)$ line shapes remain an unresolved puzzle, with enhancements observed by Belle that are absent or much weaker in the BESIII measurements. In this work, we propose a new mechanism