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We present a fit of the spin-independent electromagnetic polarisabilities ofthe proton to low-energy Compton scattering data in the framework of covariantbaryon chiral effective field theory. Using the Baldin sum rule to constraintheir sum, we obtain$\alpha=[10.6\pm0.25$(stat)$\pm0.2$(Baldin)$\pm0.4$(theory)$]\times10^{-4}$fm$^3$and $\beta=[3.2\mp0.25$(stat)$\pm0.2$(Baldin)$\mp0.4$(theory)$]\times10^{-4}$fm$^3$, inexcellent agreement with other chiral extractions of the same quantities.

Proton polarisabilities from Compton data using Covariant Chiral EFT