Top pair production with an extra gluon at the Tevatron

We calculate top pair production and decay at the Tevatron pp collider, with the emission of an extra gluon, and study the corresponding W + 5 jet top signals including full spin correlations in the W → ℓv leptonic and W → jj hadronic decays. We study the feasibility of reconstructing W + 5 jet top events with a single b-tag, including realistic energy resolution. Our suggested basic procedure based on kinematic fitting achieves about 74% reconstruction efficiency, with 74% of the reconstructed events correctly classified (purity); this improves to 82% efficiency with 77% purity in double-b-tagged events. We suggest possible refinements, based on virtuality criteria, that give higher purity at the cost of lower reconstruction efficiency.