Speaker
Description
Summary
We present results for the O(alpha_s) virtual
corrections to qg ->W b bbar q' obtained with a
new automatized approach to the evaluation of one-loop
amplitudes in terms of Feynman diagrams. Together with
the O(alpha_s) corrections to q qbar' -> W b bbar g, which
can be obtained from our results by crossing symmetry, this
represents the bulk of the next-to-leading order virtual QCD
corrections to W b bbar + j and W b + j hadronic production,
calculated in a fixed-flavor scheme with four light flavors.
Furthermore, these corrections represent a well defined and
independent subset of the 1-loop amplitudes needed for the NNLO
calculation of W b bbar. Our approach was tested against several
existing results for NLO amplitudes including selected
O(alpha_s) one-loop corrections to W + 3j hadronic production.
We discuss the efficiency of our method both with respect to
evaluation time and numerical stability.
