Sensitivity to the Single Production of Vector-Like Quarks at an Upgraded

In this note we consider the sensitivity of the Large Hadron Collider (LHC) to the single production of new heavy vector-like quarks. We consider a model with large mixing with the standard model top quark with electroweak production of single heavy top quarks. We consider center of mass energies of 14, 33, and 100 TeV with various pileup scenarios and present the expected sensitivity and exclusion limits. 1 A benchmark model for vector-like quarks Vector-like quarks (VLQs) [1] are a general prediction of a wide class of beyond the Standard Model theories, as extra dimensions, composite Higgs models (see [2, 3, 4, 5, 6, 7, 8] for recent studies on VLQs in these frameworks), Little Higgs [9, 10] and top-coloron models [11]. We will consider as a benchmark model to describe the VLQ phenomenol-ogy a two-site description that reproduces the low-energy limit of a large set of composite Higgs models (CHM) [12] and warped extra-dimensional theories with a custodial symmetry in the bulk [13]. CHMs are compelling theories of new physics. They give an explana-tion of the EWSB by considering that it is triggered by a new strong dynamics, with a scale of compositeness of several TeVs. The Higgs is a field of the composite sector. Because of its composite nature, its mass is protected from radiative corrections above the compositeness scale and is further protected if it is also the pseudo-Goldstone boson of some sym-metry breaking in the strong sector [14]. In this case the Higgs can be naturally much lighter than the other resonances from the strong sector (which have masses of the TeV order). A crucial role in this mechanism 1 a