Abstract
New light scalar particles in the mass range of hundreds of GeV, decaying into a pair of W/Z bosons can appear in several extensions of the SM. The focus of collider studies for such a scalar is often on its direct production, where the scalar is typically only mildly boosted. The observed W/Z are therefore well-separated, allowing analyses for the scalar resonance in a standard fashion as a low-mass diboson resonance. In this work we instead focus on the scenario where the direct production of the scalar is suppressed, and it is rather produced via the decay of a significantly heavier (a few TeV mass) new particle, in conjunction with SM particles. Such a process results in the scalar being highly boosted, rendering the W/Z’s from its decay merged. The final state in such a decay is a “fat” jet, which can be either four pronged (for fully hadronic W/Z decays), or may be like a W/Z jet, but with leptons buried inside (if one of the W/Z decays leptonically). In addition, this fat jet has a jet mass that can be quite different from that of the W/Z/Higgs/top quark-induced jet, and may be missed by existing searches. In this work, we develop dedicated algorithms for tagging such multi-layered “boosted dibosons” at the LHC. As a concrete application, we discuss an extension of the standard warped extra dimensional framework where such a light scalar can arise. We demonstrate that the use of these algorithms gives sensitivity in mass ranges that are otherwise poorly constrained.
Highlights
We study dedicated strategies for identifying such a light scalar decaying into merged W/Z pairs, dubbed a “boosted diboson” resonance
The case of light scalars decaying into merged W/Z pairs was studied in refs. [8, 9]
We have studied the signals from the production of a boosted light scalar φ
Summary
As outlined in the introduction (see ref. [10] for more details), we can envisage two types of Lorentz structures in the gauge couplings of φ, dubbed “tensor” and “vector” respectively. [10] for more details), we can envisage two types of Lorentz structures in the gauge couplings of φ, dubbed “tensor” and “vector” respectively. The methodology advocated in the present study applies qualitatively to both vector and tensor cases. We discuss existing experimental searches that are sensitive to direct production of a light scalar, and present the allowed parameter space. Most of the discussions of this section will be based on a simplified model where the only BSM particle is a scalar φ and it couples only to a pair of EW gauge bosons. The results of this section will demonstrate that current search methods leave open the possibility of light scalars, and motivates the exploration of alternative production topologies in which they might be discovered
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