摘要 : We perform a lattice QCD calculation of theχ_(c0)→2γdecay width using a model-independent method that does not require the momentum extrapolation of corresponding off-shell form factors.The simulation is performed on ensembles of ... 展开 We perform a lattice QCD calculation of theχ_(c0)→2γdecay width using a model-independent method that does not require the momentum extrapolation of corresponding off-shell form factors.The simulation is performed on ensembles of N_(f)=2 twisted mass lattice QCD gauge configurations with three different lattice spacings.After the continuum extrapolation,the decay width is obtained to beΓ_(γγ)(χ_(c0))=3.65(83)_(stat)(21)_(lat.syst)(66)_(syst)keV.Regardless of this large statistical error,our result is compatible with the experimental results within 1.3σ.Potential improvements of the lattice calculation in the future are also discussed. 收起