Abstract
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.
Highlights
Motivated by the conceptual issues accompanying the Standard Model, many new physics theories have been developed over the last decades
It is clear that an approach to precision predictions that is fully general in any considered theory is highly desirable, and the MadGraph5 aMC@next-to-leading order (NLO) framework [6] is in a prime position to provide it
Since we focus on QCD NLO corrections to the strong production of a pair of σ3 fields followed by their LO decays, the related counterterms are omitted from this document
Summary
Motivated by the conceptual issues accompanying the Standard Model, many new physics theories have been developed over the last decades. We make use of FeynRules to implement all possible couplings of the new fields to quarks and gluons and employ the NloCT program [7] to generate a UFO module [11] containing, in addition to tree-level model information, the ultraviolet and R2 counterterms necessary whenever the loop integral numerators are computed in four dimensions, as in MadLoop [12] that uses the Ossola-PapadopoulosPittau (OPP) reduction formalism [13] This UFO library is linked to the MadGraph aMC@NLO framework which is used, for the first time, for predictions in the context of new physics models featuring an extended colored sector. Our results follow and consist of total rates and differential distributions illustrating some kinematical properties of the produced new states and their decay products
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