NNLO massive corrections to Bhabha scattering and theoretical precision of BabaYaga@NLO

Details NNLO massive corrections to Bhabha scattering and theoretical precision of BabaYaga@NLO NNLO massive corrections to Bhabha scattering and theoretical precision of BabaYaga@NLO

2011-12-13

arxiv.org/abs/1112.2851v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 tables, contrib. to proceedings of International Workshop on e+e- collisions: from Phi to Psi, PHIPSI11, BINP, Novo

Scientific paper

We provide an exact calculation of next-to-next-to-leading order (NNLO) massive corrections to Bhabha scattering in QED, relevant for precision luminosity monitoring at meson factories. Using realistic reference event selections, exact numerical results for leptonic and hadronic corrections are given and compared with the corresponding approximate predictions of the event generator BabaYaga@NLO. It is shown that the NNLO massive corrections are necessary for luminosity measurements with per mille precision. At the same time they are found to be well accounted for in the generator at an accuracy level below the one per mille. An update of the total theoretical precision of BabaYaga@NLO is presented and possible directions for a further error reduction are sketched.

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