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

WANG Zhi-Gang

doi:10.1088/1674-1137/34/1/002

Chinese Physics C> 2010, Vol. 34> Issue(1) : 7-15 DOI: 10.1088/1674-1137/34/1/002

Analysis of the coupling constants g_a0_ηπ0 and g_a0_η′π0 with light-cone QCD sum rules

WANG Zhi-Gang ^,

Department of Physics, North China Electric Power University, Baoding 071003, China

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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 g_a0_ηπ0 and g_a0_η′π0 with the light-cone QCD sum rules. The central value of the coupling constant g_a0_ηπ0 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 Γ_a0→ηπ0=127⁺⁸⁴_－48 MeV are compatible with the experimental data of the total decay width Γ_a0(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 g_a0_ηπ0 and g_a0_η′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 g_a0_ηπ0 and g_a0_η′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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沈阳化工大学材料科学与工程学院沈阳 110142

Analysis of the coupling constants g_a0_ηπ0 and g_a0_η′π0 with light-cone QCD sum rules

Corresponding author: WANG Zhi-Gang,

Department of Physics, North China Electric Power University, Baoding 071003, China

Received Date: 2009-01-19

Accepted Date: 2009-02-24

Available Online: 2010-01-05

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 g_a0_ηπ0 and g_a0_η′π0 with the light-cone QCD sum rules. The central value of the coupling constant g_a0_ηπ0 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 Γ_a0→ηπ0=127⁺⁸⁴_－48 MeV are compatible with the experimental data of the total decay width Γ_a0(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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Analysis of the coupling constants g_a0_ηπ0 and g_a0_η′π0 with light-cone QCD sum rules

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