$W_H$-pair Production in the Littlest Higgs Model with T parity in next-to-leading order QCD at LHC

Abstract

In the framework of the littlest Higgs model with $T$ parity, we study the $W_H$-pair production at the CERN Large Hadron Collider up to the QCD next-to-leading order (NLO). The kinematic distributions of final decay products and the theoretical dependence of the cross section on the factorization/renormalization scale are analyzed. We adopt the PROSPINO scheme in the QCD NLO calculations to avoid double counting and keep the convergence of the perturbative QCD description. Our numerical results show that the QCD NLO corrections significantly reduce the scale uncertainty, and enhance the leading order integrated cross section with a $K$-factor in the range of $1.10-1.22$ ($1.09-1.17$) with the symmetry breaking scale $f$ varying from $400GeV$ ($400GeV$) to $1.5TeV$ ($1.0TeV$) at the $14TeV$ $(8TeV)$ LHC. We find that it is possible to select the signal events of the $W_H$-pair production from the $pp\to W^{+}{W}^{-}\to e^{+}{\mu }^{-}{\nu }_e{\bar{\nu }}_{\mu }+X$ background with high ratio of signature over background by taking proper lower limits on transverse momenta, invariant mass of the final charged leptons and the missing transverse momentum.

arXiv comment34 pages, 14 figures, 4 tables

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• NLO QCD corrections to same-sign $T$-odd quark pair production in the littlest Higgs model with $T$-parity at the LHC
• $T$-odd quark pair production and decay at $\gamma \gamma$ collider in the littlest Higgs model with $T$ parity in next-to-leading order QCD
• Precise calculation for heavy gauge boson production in the LHT model