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We extend our study of the pion scalar radius in two-flavour lattice QCD toinclude two additional lattice spacings as well as lighter pion masses,enabling us to perform a combined chiral and continuum extrapolation. We finddiscretisation artefacts to be small for the radius, and confirm the importanceof the disconnected diagrams in reproducing the correct chiral behaviour. Ourfinal result for the scalar radius of the pion at the physical point is$\left\langle r^2\right\rangle^\pi_{\rm S}=0.600\pm0.052$ fm$^2$, correspondingto a value of $\overline{\ell}_4=4.54\pm0.30$ for the low-energy constant$\overline{\ell}_4$ of NLO chiral perturbation theory.

The scalar radius of the pion from Lattice QCD in the continuum limit