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 $11.0{\mathrm{fb}}^{-1}$ 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 $M=(4413.6\pm 9.0\pm 0.8)\mathrm{MeV}/c^2$ and $\Gamma =(110.5\pm 15.0\pm 2.9)\mathrm{MeV}$, 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 $M=(4544.2\pm 18.7\pm 1.7)\mathrm{MeV}/c^2$ and $\Gamma =(116.1\pm 33.5\pm 1.7)\mathrm{MeV}$, respectively. The structure of this line shape, observed for the first time, requires further understanding.