The anomalous top quark coupling tqg and tW production at the LHC

Abstract

Many new physics models beyond the standard model ($SM$) can give rise to the large anomalous top couplings $tqg$ ($q=u$ and $c$). We focus our attention on these couplings induced by the topcolor-assisted technicolor ($TC2$) model and the littlest Higgs model with $T$-parity (called $LHT $ model), and consider their contributions to the production cross section and the charge asymmetry for $tW$ production at the $LHC$. We find that the anomalous top coupling $tqg$ induced by these two kinds of new physics models can indeed generate sizable charge asymmetry. The correction effects of the $LHT $ model on the production cross sections of the processes $pp\rightarrow tW^-+X$ and $pp\rightarrow \bar{t}W^++X$ are significant large, which might be detected at the $LHC$.

Typos corrected, a few discussions added