Abstract
New colorless electroweak (EW) charged spin-1 particles with mass of a few TeV arise in numerous extensions of the Standard Model (SM). Decays of such a vector into a pair of SM particles, either fermions or EW bosons, are well studied. Many of these models have an additional scalar, which can lead to (and even dominate in certain parameter regions) a novel decay channel for the heavy vector particles instead - into a SM EW boson and the scalar, which subsequently decays into a SM EW boson pair. In this work, we focus on the scalar being relatively heavy, roughly factor of two lighter than the vector particles, rendering its decay products well separated. Such a cascade decay results in a final state with three isolated bosons. We argue that for this "triboson" signal the existing diboson searches are not quite optimal due to combinatorial ambiguity for three identical bosons, and in addition, due to a relatively small signal cross-section determined by the heaviness of the decaying vector particle. In order to isolate the signal, we demonstrate that tagging all three bosons, followed by use of the full triboson invariant mass distribution as well as that of appropriate subsets of dibosons, is well motivated. We develop these general strategies in detail within the context of a specific class of models that are based on extensions of the standard warped extra-dimensional scenario. We also point out that a similar analysis would apply to models with an enlarged EW gauge sector in four dimensions, even if they involve a different Lorentz structure for the relevant couplings.
Highlights
The presence of beyond the standard model (BSM) physics at the TeV scale is highly motivated, most notably by attempts to address the Planck-weak hierarchy and dark matter problems
The new particles are in principle accessible at the Large Hadron Collider (LHC), but are still missed by the existing experimental searches because these particles decay into nonstandard final state configurations, which the current strategies are not optimized for
We show that both these scenarios can give rise to clear signals that can be observed at the LHC with a large significance
Summary
Other searches (e.g., [7]) allow subleading jets to form hadronic V-candidates While these searches may more frequently select the two φ decay products as a resonance pair, the diboson invariant mass distribution of the signal will generically have multiple bumps corresponding to different possible diboson pairings, making even these diboson searches difficult to interpret in the context of this signal. The second realization of the framework, which is a slight variation of the first, allows only the hypercharge gauge boson to propagate in the extended bulk This results in a dramatic triphoton signal from KK photon production and its decay into photon and radion, followed by a radion decay to diphoton. We provide brief discussions on samesign dilepton constraints for triW signal and the choice of jet tagging method in the appendixes
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