Measurement of e ⁺ e ⁻ → ωπ ⁺ π ⁻ cross section at √s = 2.000 to 3.080 GeV

A partial wave analysis on the process e⁺e⁻ → ωπ⁺π⁻ is performed using 647 pb⁻¹ of data sample collected by using the BESIII detector operating at the BEPCII storage ring at center-of-mass (c.m.) energies from 2.000 GeV to 3.080 GeV. The Born cross section of the e⁺e⁻ → ωπ⁺π⁻ process is measured, with precision improved by a factor of 3 compared to that of previous studies. A structure near 2.25 GeV is observed in the energy-dependent cross sections of e⁺e⁻ → ωπ⁺π⁻ and ωπ⁰π⁰ with a statistical significance of 7.6σ, and its determined mass and width are 2232 ± 19 ± 27 MeV/c² and 93 ± 53 ± 20 MeV, respectively, where the first and second uncertainties are statistical and systematic, respectively. By analyzing the cross sections of subprocesses e⁺e⁻ → ωf₀(500), ωf₀(980), ωf₀(1370), ωf₂(1270), and b₁(1235)π, a structure, with mass M = 2200 ± 11 ± 17 MeV/c² and width Γ = 74 ± 20 ± 24 MeV, is observed with a combined statistical significance of 7.9σ. The measured resonance parameters will help to reveal the nature of vector states around 2.25 GeV. [Figure not available: see fulltext.]