Automated next-to-leading order predictions for new physics at the LHC: The case of colored scalar pair production

We present for the first time the full automation of collider predictions matched with parton showers at the next-to-leading accuracy in QCD within nontrivial extensions of the standard model. The sole inputs required from the user are the model Lagrangian and the process of interest. As an application of the above, we explore scenarios beyond the standard model where new colored scalar particles can be pair produced in hadron collisions. Using simplified models to describe the new field interactions with the standard model, we present precision predictions for the LHC within the MadGraph5_aMC@NLO framework.

Figure 1

Missing transverse energy spectrum for a stop pair production and decay signal. We consider several mass setups and show results at the NLO and LO accuracy (upper panel), together with their bin-by-bin ratio (lower panel).

Figure 2

Same as Fig. 1 for the $H_T$ spectrum of sgluon signals.