Observation of structures in the processes e⁺e^-→ωχ_c1 and ωχ_c2

2024/01/26 by BESIII Collaboration, М. Н. Ачасов, Ablikim, M. +715
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies

paper · pdf · doi:10.48550/arxiv.2401.14720

Abstract

We present measurements of the Born cross sections for the processes e⁺e^-→ωχ_c1 and ωχ_c2 at center-of-mass energies √(s) from 4.308 to 4.951 GeV. The measurements are performed with data samples corresponding to an integrated luminosity of 11.0 \rmfb^-1 collected with the BESIII detector operating at the BEPCII storage ring. Assuming the e⁺e^-→ωχ_c2 signals come from a single resonance, the mass and width are determined to be M=(4413.6±9.0±0.8) MeV/c² and Γ=(110.5±15.0±2.9) MeV, respectively, which is consistent with the parameters of the well-established resonance ψ(4415). In addition, we also use one single resonance to describe the e⁺e^-→ωχ_c1 lineshape, and determine the mass and width to be M=(4544.2±18.7±1.7) MeV/c² and Γ=(116.1±33.5±1.7) MeV, respectively. The structure of this lineshape, observed for the first time, requires further understanding.

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