Search for single vector-like B -> tW decays in a single-lepton final state*

We present a search for a single vector-like B quark that decays to a top quark and W boson. In the single lepton final state, the B quark can be reconstructed from the lepton, missing transverse momentum, and one large-radius jet. The deep network algorithm called ParticleNet is used to identify the parent particle of the large-radius jet and provides an important boost in sensitivity with respect to prior searches. Several neural network architectures have been studied to improve discrimination between signal and background. The search strategy and current status will be presented.