Observation of Structures in the Processes ${e}^{+}{e}^{-}\to \omega {\chi }_{c1}$ and $\omega {\chi }_{c2}$

We present measurements of the Born cross sections for the processes ${e}^{+}{e}^{-}\to \omega {\chi }_{c1}$ and $\omega {\chi }_{c2}$ at center-of-mass energies $\sqrt{s}$ from 4.308 to 4.951 GeV. The measurements are performed with data samples corresponding to an integrated luminosity of $11.0\text{}\text{}{\mathrm{fb}}^{-1}$ collected with the BESIII detector operating at the Beijing Electron Positron Collider storage ring. Assuming the ${e}^{+}{e}^{-}\to \omega {\chi }_{c2}$ signals come from a single resonance, the mass and width are determined to be $M=\left(4413.6±9.0±0.8\right)\text{}\text{}\mathrm{MeV}/{c}^{2}$ and $\Gamma =\left(110.5±15.0±2.9\right)\text{}\text{}\mathrm{MeV}$, respectively, which is consistent with the parameters of the well-established resonance $\psi \left(4415\right)$. In addition, we also use one single resonance to describe the ${e}^{+}{e}^{-}\to \omega {\chi }_{c1}$ line shape and determine the mass and width to be $M=\left(4544.2±18.7±1.7\right)\text{}\text{}\mathrm{MeV}/{c}^{2}$ and $\Gamma =\left(116.1±33.5±1.7\right)\text{}\text{}\mathrm{MeV}$, respectively. The structure of this line shape, observed for the first time, requires further understanding.