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

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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 ${\cal R}$ distribution, which depends on the invariant mass of the $t\bar{t}j$-system, we present reference predictions in the on-shell, $\overline{\mbox{MS}}$ and MSR top-quark mass renormalization schemes, applying the latter scheme to this process for the first time.