Speaker
Jia Zhou
(SUNY at Buffalo)
Description
Electroweak (EW) corrections at the LHC can be enhanced at high
energies due to soft/collinear radiation of W and Z bosons, being
dominated by Sudakov-like corrections in the form of
$\alpha_W^l\log^n(Q^2/M_W^2)\;(n\le 2l-1, \alpha_W =
\frac{\alpha}{4\pi\sin\theta_W^2})$ when the energy scale $Q$ enters
the TeV regime. Thus, the inclusion of EW corrections in LHC predictions
is important for the search of possible new physics in tails of
distributions. EW corrections should also be taken into account in
virtue of its comparable size ($\mathcal{O}(\alpha)$) to that of higher
order QCD corrections ($\mathcal{O}(\alpha_s^2)$).
We calculated the next-to-leading-order (NLO) weak corrections to the neutral-current (NC) Drell-Yan process, top-quark pair production and dijet producion,
respectively, and implemented them in the Monte-Carlo program MCFM. This enables a combined study with the corresponding NLO QCD corrections. We provide
both the full NLO weak corrections and their weak Sudakov approximation valid at
high energies. The latter is often used for a fast evaluation of weak effects, and having the exact result available as well allows to quantify the
validity of the Sudakov approximation.
