Timothy Martonhelyi (U. Massachusetts, Amherst)

10:30am Monday Dec 16, 2024
Geoff Opat Seminar Room

Phenomenological Studies of Heavy Spin-One Resonances at Current and Future Colliders

In many beyond the Standard Model theories, TeV-scale spin-one resonances often emerge as the lightest new particles. We introduce two model-independent frameworks which describe colourless SU(2) triplets and singlets, the study of which applies to a broad class of these theories. We construct a simplified model of heavy vector singlets, and discuss semi-analytic formulae for production at proton colliders, requirements to obey the narrow width approximation, and selected low energy constraints. We show current LHC constraints and sensitivity projections for the HL-LHC, HE-LHC, SPPC and FCC-hh. The utility of the simplified model Lagrangian is demonstrated by matching these results onto three explicit models: two weakly coupled extensions of the Standard Model, and one strongly coupled composite Higgs scenario.

We further demonstrate the power of the simplified model approach by applying a well known simplified model, the heavy vector triplet model (HVT), to a variety of novel scenarios. We clarify the role of vector boson fusion (VBF) in the production of heavy vectors at proton colliders. Using current searches at the LHC and HL-LHC projections in the di-lepton and di-boson final state, we show that VBF production outperforms Drell-Yan production in certain regions of the parameter space when the resonance mass is above 1 TeV. We also apply the HVT model to a future muon collider as a motivation for future collider efforts. We discuss the importance of associated production and VBF, and aim to estimate the sensitivity of a muon collider to heavy spin-one particles above the TeV scale.