Electroweak corrections to $t\bar{t}$ production at hadron colliders

Abstract

We report on our recent work on electroweak corrections to $t\bar{t}$ production at hadron colliders. Specifically, we discuss the weak-interaction contributions to the top quark transverse momentum and $t \bar{t}$ invariant mass distributions and an induced parity-violating top-spin asymmetry.

Figures (3)

• Figure 1: a) Ratios $(d\sigma_{weak}/dp_T)/(d\sigma_{LO}/ dp_T)$, where $d\sigma_{weak}$ are the weak-interaction corrections i), ii), and iii) to the reactions (\ref{['bb']}), (\ref{['gqqb']}), and $q {\bar{q}}, gg \to t {\bar{t}}$$(q\neq b)$, respectively. The latter corrections are shown for two different values of the Higgs boson mass. The hatched areas arise from scale variations as described in the text. b) Sum of the ratios shown in a) for two different values of $m_H$.
• Figure 2: a) Ratios $(d\sigma_{weak}/dM_{t \bar{t}})/(d\sigma_{LO}/dM_{t \bar{t}})$, where $d\sigma_{weak}$ refers to the weak-interaction corrections i), ii), and iii). The latter corrections are shown for two different values of the Higgs boson mass. The hatched areas arise from scale variations as described in the text. b) Sum of the ratios shown in a) for two different values of $m_H$.
• Figure 3: a) Contributions of the various partonic subprocesses to the helicity asymmetry $\Delta_{hel}$: initial states $q \bar{q}$$(q\neq b)$ and $gg$ (thin line), $qg$ and ${\bar{q}}g$$(q=u,...,b)$ (vertically hatched area), and $b \bar{b}$ (cross hatched area). b) Sum of the three contributions shown in a) as computed in Bernreuther:2008md.