Phenomenology of $t\bar{t}j+X$ production at the LHC

Abstract

We present phenomenological results for $t\bar{t}j+X$ production at the Large Hadron Collider, of interest for designing forthcoming experimental analyses of this process. We focus on those cases where the $t\bar{t}j+X$ process is considered as a signal. We discuss present theoretical uncertainties and the dependence on relevant input parameters entering the computation. For the $\mathcal{R}$ distribution, which depends on the invariant mass of the $t\bar{t}j$-system, we present reference predictions in the on-shell, $\overline{\text{mbox}MS}$ and MSR top-quark mass renormalization schemes, applying the latter scheme to this process for the first time. Our conclusions are particularly interesting for those analyses aiming at extracting the top-quark mass from cross-section measurements.

Comments: 64 pages, LaTeX, 38 figures, 14 tables, slightly modified version, as in JHEP