Observation of Structures in the Processes e^{+}e^{-}→ωχ_{c1} and ωχ_{c2}.

Area of Science:

• High Energy Physics
• Particle Physics
• Quantum Chromodynamics

Background:

• Understanding the properties of charmonium states and their production mechanisms is crucial in particle physics.
• Previous studies have explored various charmonium resonances, but the specific production of ωχ_{c1} and ωχ_{c2} via electron-positron annihilation requires further investigation.

Purpose of the Study:

• To measure the Born cross sections for the processes e^{+}e^{-}→ωχ_{c1} and e^{+}e^{-}→ωχ_{c2}.
• To determine the mass and width of the resonances involved in these processes.
• To investigate the line shape of the e^{+}e^{-}→ωχ_{c1} process, which is observed for the first time.

Main Methods:

• Utilized data samples corresponding to an integrated luminosity of 11.0 fb^{-1} collected with the BESIII detector.
• Analyzed electron-positron collision data at center-of-mass energies ranging from 4.308 to 4.951 GeV.
• Applied resonance models to determine the mass and width parameters for the observed processes.

Main Results:

• Measured the Born cross sections for e^{+}e^{-}→ωχ_{c1} and e^{+}e^{-}→ωχ_{c2}.
• Determined the mass and width for e^{+}e^{-}→ωχ_{c2} to be M=(4413.6±9.0±0.8) MeV/c^{2} and Γ=(110.5±15.0±2.9) MeV, consistent with ψ(4415).
• Determined the mass and width for e^{+}e^{-}→ωχ_{c1} to be M=(4544.2±18.7±1.7) MeV/c^{2} and Γ=(116.1±33.5±1.7) MeV, characterizing a newly observed line shape.

Conclusions:

• The measured parameters for e^{+}e^{-}→ωχ_{c2} align with the established ψ(4415) resonance.
• The newly observed line shape in e^{+}e^{-}→ωχ_{c1} requires further theoretical and experimental understanding.
• These findings contribute to the detailed study of charmonium spectroscopy and production mechanisms in e^{+}e^{-} collisions.