Probing a leptophobic top-colour model with cross section measurements and precise signal and background predictions: a case study

Abstract

The sensitivity of particle-level fiducial cross section measurements from ATLAS, CMS and LHCb to a leptophobic top-colour model is studied. The model has previously been the subject of resonance searches. Here we compare it directly to state-of-the-art predictions for Standard Model top quark production and also take into account next-to-leading order predictions for the new physics signal. We make use of the Contur framework to evaluate the sensitivity of the current measurements, first under the default Contur assumption that the measurement and the SM exactly coincide, and then using the full SM theory calculation for t t at next-to-leading and next-to-next-to-leading order as the background model. We derive exclusion limits, discuss the differences between these approaches, and compare to the limits from resonance searches by ATLAS and CMS.

Combined constraints on dark photons and discovery prospects at the LHC and the Forward Physics Facility

“…This procedure is then repeated for each set of parameter values resulting in a map of CL exclusions (more information about Contur and its statistical method used to perform the exclusion procedure can be found in [34]). Many studies were performed using the Contur toolkit to check different BSM scenarios [35][36][37][38] and it was shown that limits from precision measurements of SM processes can be more constraining than BSM searches at the LHC in some parts of the parameter space [39]. In this work, we use Contur to set limits on the parameter space of our model.…”

Hidden sectors and their implications for particle physics and cosmology

“…This procedure is then repeated for each set of parameter values resulting in a map of CL exclusions (more information about Contur and its statistical method used to perform the exclusion procedure can be found in [186]). Many studies were performed using the Contur toolkit to check different BSM scenarios [187,188,189,190] and it was shown that limits from precision measurements of SM processes can be more constraining than BSM searches at the LHC in some parts of the parameter space [191]. In this chapter, we use Contur to set limits on the parameter space of our model.…”