2017/11/21 by S. E. von Buddenbrock, Alan S. Cornell, von Buddenbrock, Stefan +7 · 3 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.1711.07874
openalex publication_date 2017/11/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Following a prediction made in Refs.~\citevonBuddenbrock:2015ema,Kumar:2016vut,vonBuddenbrock:2016rmr, this paper focuses on multi-lepton signatures arising from two new hypothetical scalar bosons, H and S, at the Large Hadron Collider (LHC). These two new bosons are an extension to the Standard Model (SM) and interact with the SM Higgs boson, h. We consider two production modes for H, one being gluon fusion and the other being in association with top quarks. The H → S h decay mode is considered, where leptonic final states are studied. The CP properties of S are characterised by considering effective couplings derived from dimension six operators through SWW vertices. The nature of the S boson is considered in two separate contexts. Firstly in a simplified model, it is considered to have Higgs-like couplings. Secondly, we consider a heavy neutrino model and its interactions with the Z, W and S bosons. The predictions of the models are compared both to ATLAS and CMS results at √(s) = 8 and 13~TeV, where appropriate. The data is interpreted using a simplified model where all the signal comes from H → S h, assuming S to be Higgs-like, mH=270~GeV and mS=150~GeV. The combined result yields gives a best fit value for the parameter βg (the strength of the Yukawa coupling of H to top quarks), βg2=1.38± 0.22. A number of regions of the phase space are suggested to the experiments for further exploration.