Probing the Goldstone equivalence theorem in Heavy Weak Doublet Decays

TL;DR

This study explores heavy higgsino-like doublet decays at the LHC to test the Goldstone equivalence theorem, compare decay ratios across models, and assess detection prospects through detailed Monte Carlo simulations.

Contribution

It provides a comprehensive analysis of decay channels and ratios to probe the Goldstone equivalence theorem and distinguish between BSM models using LHC data.

Findings

Decay channels yield distinct final states like 4l, 2l 2b, and 4b + MET + jets.

Comparison of Z/h decay ratios across MSSM, NMSSM, and singlet-doublet models.

Monte Carlo analysis indicates feasible detection prospects at 14 TeV LHC.

Abstract

This paper investigates the decays from heavy higgsino-like weak-doublets into Z, h bosons and missing particles. When pair-produced at the LHC, the subsequent Z, h to 2l, 2b decays in the doublet decay cascade can yield 4l, 2l 2b, and 4b + MET + jets final states. Mutual observation of any two of these channels would provide information on the the associated doublets' decay branching fractions into a Z or h, thereby probing the Goldstone equivalence relation, shedding additional light on the Higgs sector of beyond the Standard Model theories, and facilitating the discrimination of various contending models, in turn. We compare the Z/h decay ratio expected in the Minimal Supersymmetric model, the Next-to Minimal Supersymmetric model and a minimal singlet-doublet dark matter model. Additionally, we conduct a full Monte Carlo analysis of the prospects for detecting the targeted final states during 14 TeV running of the LHC in the context of a representative NMSSM benchmark model.