One-loop effects on top pair production in the littlest Higgs model with T-parity at the LHC

TL;DR

This paper examines one-loop corrections in the littlest Higgs model with T-parity at the LHC, finding small effects on top pair production but potential signals in parity-violating asymmetries.

Contribution

It provides a systematic analysis of one-loop effects of LHT particles on top pair production and related asymmetries at the LHC and Tevatron.

Findings

LHT contributions to $t\bar{t}$ cross section are about 1% at 14 TeV LHC.

LHT explains little of the Tevatron top forward-backward asymmetry.

Parity violating asymmetries could signal LHT effects at the LHC.

Abstract

In this work, we systematically investigate the one-loop corrections to $t\bar{t}$ production in the littlest Higgs model with T-parity (LHT) at the LHC for $\sqrt{s}=8,14$ TeV. We focus on the effects of LHT particles on $t\bar{t}$ cross section, polarization asymmetries, spin correlation and charge asymmetry at the LHC. We also study the top quark forward-backward asymmetry at Tevatron and its correlations with the LHC observables. We found that: (1) the contributions of the LHT particles to $t\bar{t}$ production can only reach about 1% at the 14 TeV LHC. Meanwhile, the anomalous top quark forward-backward asymmetry at Tevatron is also hardly to be explained in the LHT model. (2) the parity violating asymmetries in $t\bar{t}$ production, such as left-right asymmetry $|A_{LR}|$ and the polarization $|P_t|$ can respectively reach 1.1% and 0.5%, which may have the potential to provide a signal of LHT at the LHC.