Abstract
Searches for new leptophobic resonances at high energy colliders usually target their decay modes into pairs of light quarks, top quarks, or standard model bosons. Additional decay modes may also be present, producing signatures to which current searches are not sensitive. We investigate the performance of generic searches that look for resonances decaying into two large-radius jets. As benchmark for our analysis we use a supersymmetric text {U}(1)' extension of the Standard Model, the so-called Umu nu SSM, where all the SM decay modes of the Z' boson take place, plus additional (cascade) decays into new scalars. The generic searches use a generic multi-pronged jet tagger and take advantage of the presence of b quarks in the large-radius jets, and are sensitive to all these Z' decay modes (except into light quarks) at once. For couplings that are well below current experimental constraints, these generic searches are sensitive at the 3sigma -4sigma level with Run 2 LHC data.
Highlights
Realistic extensions of the Standard Model (SM) involve several new particles in addition to the already discovered ones, which likely appear at different mass scales
The simplest scenario where generic searches become very useful is the decay of a very heavy resonance R into two particles at the electroweak scale, which can in turn decay into quarks, or into lighter new particles which decay into quarks
Jets stemming from the five Z decay modes into massive particles are correctly classified as signal with a distribution leaning to the r.h.s. of the plot, while QCD jets are classified as background
Summary
Realistic extensions of the Standard Model (SM) involve several new particles in addition to the already discovered ones, which likely appear at different mass scales. In order to search for all these signatures at once, one needs a strategy that generalises the usual diboson resonance searches Such strategy relies on (i) a generic tagger, for two-pronged jets, but rather for any type of multi-pronged jets; (ii) b tagging of subjets inside the large-radius jets, to take advantage of the expected presence of b quarks in the cascade decays. With this strategy, searches are sensitive to resonances R of any spin, and decay products that can be either scalars or vector bosons, because the generic tagger is so designed. Our conclusions and a discussion of possible generalisations are left for Sect. 4
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