Analysis of the coupling constants ga0ηπ0 and ga0η′π0 with light-cone QCD sum rules

  • In this article, we take the point of view that the light scalar meson a0(980) is a conventional qq state, and calculate the coupling constants ga0ηπ0 and ga0η′π0 with the light-cone QCD sum rules. The central value of the coupling constant ga0ηπ0 is consistent with that extracted from the radiative decay φ(1020)→a0(980)γ→ηπ0γ. The central value and lower bound of the decay width Γa0→ηπ0=127+84-48 MeV are compatible with the experimental data of the total decay width Γa0(980)=(50-100) MeV from the Particle Data Group with a very model dependent estimation (the decay width can be much larger), while the upper bound is too large. We give a possible explanation for the discrepancy between the theoretical calculation and experimental data.

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WANG Zhi-Gang. Analysis of the coupling constants ga0ηπ0 and ga0η′π0 with light-cone QCD sum rules[J]. Chinese Physics C, 2010, 34(1): 7-15. doi: 10.1088/1674-1137/34/1/002
WANG Zhi-Gang. Analysis of the coupling constants ga0ηπ0 and ga0η′π0 with light-cone QCD sum rules[J]. Chinese Physics C, 2010, 34(1): 7-15.  doi: 10.1088/1674-1137/34/1/002 shu
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Received: 2009-01-19
Revised: 2009-02-24
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Analysis of the coupling constants ga0ηπ0 and ga0η′π0 with light-cone QCD sum rules

    Corresponding author: WANG Zhi-Gang,
  • Department of Physics, North China Electric Power University, Baoding 071003, China

Abstract: 

In this article, we take the point of view that the light scalar meson a0(980) is a conventional qq state, and calculate the coupling constants ga0ηπ0 and ga0η′π0 with the light-cone QCD sum rules. The central value of the coupling constant ga0ηπ0 is consistent with that extracted from the radiative decay φ(1020)→a0(980)γ→ηπ0γ. The central value and lower bound of the decay width Γa0→ηπ0=127+84-48 MeV are compatible with the experimental data of the total decay width Γa0(980)=(50-100) MeV from the Particle Data Group with a very model dependent estimation (the decay width can be much larger), while the upper bound is too large. We give a possible explanation for the discrepancy between the theoretical calculation and experimental data.

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