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

Abstract

In this work, we systematically investigate the one-loop corrections to ttˉt\bar{t} production in the littlest Higgs model with T-parity (LHT) at the LHC for s=8,14\sqrt{s}=8,14 TeV. We focus on the effects of LHT particles on ttˉt\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 ttˉt\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 ttˉt\bar{t} production, such as left-right asymmetry ∣ALR∣|A_{LR}| and the polarization ∣Pt∣|P_t| can respectively reach 1.1% and 0.5%, which may have the potential to provide a signal of LHT at the LHC.Comment: Accepted for publication in the European Physical Journal

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