Search for $W^{\prime }$ signal via $t{W}^{\prime }$ associated production at LHC

Abstract

A variety of new physics models predict the existence of extra charged gauge bosons ($W^{\prime }$). It is verified that $W^{\prime }$ and top quark associated production is a promising process to search for $W^{\prime }$ signal at the LHC. We study the collider signatures of multi-jets$+$lepton$+\met$ by reconstructing the $t{W}^{\prime }$ intermediate state through the decay modes of $W^{\prime }\to tb$, $W^{\prime }\to q{\bar{q}}^{\prime }$ and $W^{\prime }\to l\nu$ respectively. An angular distribution related to charged lepton and top quark moving direction is provided to distinguish alternative left-handed or right-handed chiral couplings of $W^{\prime }$ to quarks in the hadronic decay modes. The superiority on the search of $W^{\prime }$ is demonstrated in the leptonic decay channel for the left-handed type interaction, which is forbidden for the right-handed type interaction in the most theories. To be more realistic, the relevant standard model backgrounds are simulated. We adopt various kinematic cuts to suppress the backgrounds and collect the integral luminosity needed for the corresponding process detected at the LHC with $3\sigma$ sensitivity. We also provide a forward-backward asymmetry which is related to the chirality of $W^{\prime }$. The successive studies can shed light on the potential searching for $W^{\prime }$ signal as well as distinguishing typical new physics models.

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