3,395 research outputs found
On the massive two-loop corrections to Bhabha scattering
We overview the general status of higher order corrections to Bhabha
scattering and review recent progress in the determination of the two-loop
virtual corrections. Quite recently, they were derived from combining a
massless calculation and contributions with electron sub-loops. For a massive
calculation, the self-energy and vertex master integrals are known, while most
of the two-loop boxes are not. We demonstrate with an example that a study of
systems of differential equations, combined with Mellin-Barnes representations
for single masters, might open a way for their systematic calculation.Comment: 8 pages, 2 figures, latex, Contribution to Proceedings of XXIX Conf.
of Theoretical Physics: Matter to the Deepest, Ustron, Poland, 8-14 September
2005; preprint number adde
Theoretical improvements for luminosity monitoring at low energies
A comparison of theoretical results on NNLO leptonic and hadronic corrections
to Bhabha scattering with the Monte Carlo generator BabaYaga@NLO used at meson
factories is given. Complete NLO virtual corrections to the process are discussed.Comment: 8 pages, 4 figs, presented by J.Gluza at Radcor 201
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