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Virtual fermionic N_f = 1 and N_f = 2 contributions to Bhabha scattering arecombined with realistic real corrections at next-to-next-to-leading order inQED. The virtual corrections are determined by the package bha_nnlo_hf, andreal corrections with the Monte Carlo generators Bhagen-1Ph, Helac-Phegas andEkhara. Numerical results are discussed at the energies of and with realisticcuts used at the Phi factory DAFNE, at the B factories PEP-II and KEK, and atthe charm/tau factory BEPC II. We compare these complete calculations with theapproximate ones realized in the generator BabaYaga@NLO used at meson factoriesto evaluate their luminosities. For realistic reference event selections wefind agreement for the NNLO leptonic and hadronic corrections within 0.07% orbetter and conclude that they are well accounted for in the generator bycomparison with the present experimental accuracy.

NNLO leptonic and hadronic corrections to Bhabha scattering and luminosity monitoring at meson factories