Abstract
Virtual fermionic N f = 1 and N f = 2 contributions to Bhabha scattering are combined with realistic real corrections at next-to-next-to-leading order in QED. The virtual corrections are determined by the package bha_nnlo_hf, and real corrections with the Monte Carlo generators Bhagen-1Ph, Helac-Phegas and Ekhara. Numerical results are discussed at the energies of and with realistic cuts used at the Φ factory DANE, at the B factories PEP-II and KEK, and at the charm/τ factory BEPC II. We compare these complete calculations with the approximate ones realized in the generator BabaYaga@NLO used at meson factories to evaluate their luminosities. For realistic reference event selections we find agreement for the NNLO leptonic and hadronic corrections within 0.07% or better and conclude that they are well accounted for in the generator by comparison with the present experimental accuracy.
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Calame, C.C., Czyż, H., Gluza, J. et al. NNLO leptonic and hadronic corrections to Bhabha scattering and luminosity monitoring at meson factories. J. High Energ. Phys. 2011, 126 (2011). https://doi.org/10.1007/JHEP07(2011)126
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DOI: https://doi.org/10.1007/JHEP07(2011)126