Slope of the topological susceptibility at zero temperature and finite temperature in the Nambu–Jona-Lasinio model

We estimate the slope of the topological susceptibility in the three flavour Nambu–Jona-Lasinio model with the ʹt Hooft interaction. The results are consistent with the evaluation from the QCD sum rule in favour of the full topological susceptibility. We apply it to the Shore–Veneziano formula to find that it shows satisfactory agreement with the anomalous suppression of the flavour-singlet axial charge. The behaviour at finite temperature is also discussed.