Exclusion of heavy, broad resonances from precise measurements of WZ and VH final states at the LHC

Abstract

A novel search for heavy vector resonances in the $H\to b\bar{b}$ and $Z\to b\bar{b}$ final states in association with a leptonically decaying $V$ ($Z$ or $W$) and $W$-only respectively, is proposed. It is argued that excesses with respect to the Standard Model prediction should be observed in all final states (0, 1 or 2 leptons), with the 1-lepton final state being the strongest. Since the relative strengths of these excesses depend on branching ratios and efficiencies, this is a clear signal for the presence of heavy resonances or their low mass tails. A general vector-triplet model is used to explore the discovery potential as a function of the resonance mass and width. Recent Higgs to $b\bar{b}$ observation data reported by the experiments ATLAS and CMS are used to test the model. Current limits are extended to resonance widths over mass as large as 9%.

arXiv commentAccepted by European Physical Journal C

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• High $P_T$ Higgs excess as a signal of non-local QFT at the LHC
• Model-independent searches for new physics in multi-body invariant masses