Measurement of e + e − → ωπ + π − cross section at √(s) = 2 . 000 to 3 . 080 GeV

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Journal of High Energy Physics（2023）

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Abstract

bstract 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 ωπ 0 π 0 with a statistical significance of 7.6 σ , and its determined mass and width are 2232 ± 19 ± 27 MeV /c 2 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 − → ωf 0 (500), ωf 0 (980), ωf 0 (1370), ωf 2 (1270), and b 1 (1235) π , a structure, with mass M = 2200 ± 11 ± 17 MeV/ c 2 and width Γ = 74 ± 20 ± 24 MeV, is observed with a combined statistical significance of 7.9 σ . The measured resonance parameters will help to reveal the nature of vector states around 2.25 GeV.

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Key words

e+-e− Experiments,Particle and Resonance Production,Vector Boson Production

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