Analysis of the coupling constants g(a0 eta pi)0 and g(a0 eta 'pi)0 with light-cone QCD sum rules

作者：Wang Zhi Gang^*

来源：Chinese Physics C, 2010, 34(1): 7-15.

• a(0)(980)
• light-cone QCD sum rules

In this article, we take the point of view that the light scalar meson a(0)(980) is a conventional q (q) over bar state, and calculate the coupling constants g(a0 eta pi)0 and g(a0 eta'pi)0 with the light-cone QCD sum rules. The central value of the coupling constant g(a0 eta pi)0 is consistent with that extracted from the radiative decay phi(1020) -> a(0)(980)gamma -> eta pi(0)gamma. The central value and lower bound of the decay width Gamma(a0) (-> eta pi 0) = 127(-48)(+84) MeV are compatible with the experimental data of the total decay width Gamma(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.

• 出版日期2010-1
• 单位华北电力大学