Speaker
Qian Song
Description
Motivated by the anticipated high precision for the measurement of the cross section of e^+e^- to ZH process, we present a complete calculation of the next-to-next-to-leading (NNLO) electroweak corrections involving closed fermion loops. This has been achieved by using a semi-numerical technique for the two-loop vertex and box diagrams, which is based on Feynman parameters and dispersion relations for one of the two sub-loops. UV divergences are treated with suitable subtraction terms. Virtual IR divergence is regulated by introducing a small fictitous photon mass. This calculation method could also be applied to NNLO EW corrections for other 2 to 2 scattering process.
Authors
Ayres Freitas
Qian Song
