Searching for Multijet Resonances at the LHC

TL;DR

The paper investigates the discovery prospects for TeV-scale colored resonances arising from a hypercolor-inspired sector, focusing on colorons (color octet vectors) and hyperpions (color octet scalars) that predominantly decay to multijet final states. It develops a phenomenological Lagrangian and benchmarks it against the LHC environment, proposing two complementary search channels: a four-jet analysis targeting hyperpion resonances and an eight-jet analysis targeting coloron pair production, with a self-calibrating workflow that ties both analyses to observed mass peaks. Using SHERPA/AMEGIC++ and related tools, the study demonstrates that hyperpions can be discovered with modest data, while colorons can be reconstructed with larger data sets, even under sizable background uncertainties. The approach is shown to be robust and broadly applicable beyond this specific model, providing a template for multijet resonance searches as a standard strategy at hadron colliders.

Abstract

Recently it was shown that there is a class of models in which colored vector and scalar resonances can be copiously produced at the Tevatron with decays to multijet final states, consistent with all experimental constraints and having strong discovery potential. We investigate the collider phenomenology of TeV scale colored resonances at the LHC and demonstrate a strong discovery potential for the scalars with early data as well as the vectors with additional statistics. We argue that the signal can be self-calibrating and using this fact we propose a search strategy which we show to be robust to systematic errors typically expected from Monte Carlo background estimates. We model the resonances with a phenomenological Lagrangian that describes them as bound states of colored vectorlike fermions due to new confining gauge interactions. However, the phenomenological Lagrangian treatment is quite general and can represent other scenarios of microscopic physics as well.