Observation of a resonant structure in e⁺e⁻ → ωη and another in e⁺e⁻ → ωπ⁰ at center-of-mass energies between 2.00 and 3.08 GeV

Born cross sections for the processes e⁺e⁻→ωη and e⁺e⁻→ωπ⁰ have been determined for center-of-mass energies between 2.00 and 3.08 GeV with the BESIII detector at the BEPCII collider. The results obtained in this work are consistent with previous measurements but with improved precision. Two resonant structures are observed. In the e⁺e⁻→ωη cross sections, a resonance with a mass of (2176±24±3)MeV/c² and a width of (89±50±5)MeV is observed with a significance of 6.2σ. Its properties are consistent with the ϕ(2170). In the e⁺e⁻→ωπ⁰ cross sections, a resonance denoted Y(2040) is observed with a significance of more than 10σ. Its mass and width are determined to be (2034±13±9)MeV/c² and (234±30±25)MeV, respectively, where the first uncertainties are statistical and the second ones are systematic.