Speaker
Description
We introduce a local infrared subtraction method for next-to-next-to-leading
order QCD calculations in color singlet decays, with counterterms based on
scalar radiators and pure splitting functions. Overlapping singularities in the
multipole radiation pattern are disentangled by partial fractioning, and the
kinematics mapping corresponds to iterated next-to-leading order kinematics.
We verify that the double-real remainder to $e^+e^-\to\;q\bar{q}$ is rendered
finite in the single and double unresolved limits and investigate the numerical
convergence of the Monte-Carlo integral. We compute the phase-space integrals
of the scalar counterterms in the back-to-back configuration, both analytically
and with the help of numerical techniques based on sector decomposition.