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October 20, 2025Open Access

Role of a₀ (980) in the decays D^0 K^+ K^- and ^+ ^-

Key Points

The a_0(980) state significantly influences D^0 decays, with results aligning with experimental findings.
Analysis includes contributions from intermediate resonances like ρ(770) and φ(1020), enhancing the decay model's accuracy.
Combined fits of invariant mass spectra from Belle and BESIII data confirm the presence of a_0(980) with strong significance.
The production of a_0(980)^+ and a_0(980)^- is effectively described by the antisymmetry data in the fitting process.

Abstract

In present work, we study the reactions D^0 K^+ K^- and D⁰ ^+ ^-, and find that the a₀ (980) state plays a dominant role. At the quark level, the external and internal W-emission mechanisms are taken into account, which can hadronize into the final states, and then the a₀ (980) state is generated from the final state interaction. Besides, the contributions of other intermediate resonances, such as (770) and (1020), are also considered. We make a combined fit of the invariant mass spectra measured by the Belle and BESIII Collaborations, where the results are in good agreement with the experiments, and the signal of the a₀ (980) shows great significance. Besides, the antisymmetry data for the production of the a₀ (980) ^+ and a₀ (980) ^- is described well in the combined fit.

Role of a₀ (980) in the decays D^0 K^+ K^- and ^+ ^-

Key Points

Abstract

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