Speaker
Description
The CMS and ATLAS experiments have made clear observations of a Standard Model (SM) Higgs boson candidate with a mass of 125 GeV. While its discovery has reaffirmed the SM, detailed measurements of its properties and searches for additional similar undiscovered particles are promising methods of discovering Beyond SM (BSM) physics. A search for the SM Higgs boson decaying to Z boson and a photon have been conducted, but lacks the sensitivity to confirm or reject the SM Higgs hypothesis. The SM backgrounds arise from the production of a Z boson and a radiated photon or mis-reconstructed jet mimicking a photon, which greatly outnumber the small expected signal from H→ Zγ or X→ Zγ where “X” is a new scalar particle. However, other theoretical models exist that predict the existence of a composite Higgs boson, in which the coupling to heavier scalar bosons is more favourable for the Z and photon production mode. This work involves the search for a new Spin-0 particle (X) using Zγ resonance in leptonic final states with full Run-2 data of 137 fb-1 at √s =13 TeV. The search will look for a mass bump over continuous SM continuum backgrounds which provides a clear experimental signature. The process considered is gluon-gluon → X → Zγ where Z further decays to e+e-/μ+μ−. In this talk the preliminary results for the leptonic channels will be presented.
| Session | Beyond the Standard Model |
|---|
