Speaker
Bijan Chokoufe
(DESY)
Description
Building on the new automatic subtraction of NLO amplitudes in WHIZARD,
we discuss our implementation of the POWHEG scheme to match the
radiative corrections consistently with the parton shower.
Doing so, we consider also the ambiguities involved in the selection of the
terms that are resummed to all orders. Although these ambiguities are of higher
order, they can be numerically important.
We study these effects at linear collider processes like $e^+ e^- \rightarrow
t\bar{t}H$ or $e^+ e^- \rightarrow W^+ W^- b \bar{b}$. In this context, it is
also interesting to see the impact and interplay of the QCD corrections with
beamstrahlung and lepton ISR.
Author
Bijan Chokoufe
(DESY)
