Higher-order multipole amplitude measurement in $\psi (2S)\to \gamma {\chi }_{c2}$

BESIII Collaboration

Using $106\times 10^6$ $\psi (2S)$ events collected with the BESIII detector at the BEPCII storage ring, the higher-order multipole amplitudes in the radiative transition $ψ(2S)\toγχ_{c…