Abstract
Many extensions to the Standard Model predict new particles decaying into two bosons (W , Z , photon, or Higgs bosons) making these important signatures in the search for new physics. Searches for such diboson resonances have been performed in final states with different numbers of leptons, photons, jets and b -jets where new jet substructure techniques to disentangle the hadronic decay products in highly boosted configuration are being used. This document summarizes recent ATLAS searches for resonances decaying to diboson final states, VV , VH and HH with LHC Run 2 data collected.
Highlights
The discovery of the Higgs boson [1] with a mass of approximately 125 GeV in 2012 finalizes the Standard Model (SM) in the description of particle interactions at energies up to a few hundred GeV
Many of Beyond the Standard Model (BSM) models, motivated by hierarchy and naturalness arguments [2], predict the existence of new heavy resonances decaying into diboson, such as composite Higgs models [3], warped extra dimensions [4], models with an extended Higgs sector [5] and Grand Unified Theories [6]
Limits on cross-sections as a function of the particle mass are obtained in the framework of three representative benchmark models: an extended Higgs sector serves as benchmark model for spin-0 resonances, Heavy Vector Triplets (HVT) Model A and Model B for spin-1 in form of W and Z [7], and bulk Randall-Sundrum Gravitons (RSG) [8] for spin-2 resonances
Summary
The discovery of the Higgs boson [1] with a mass of approximately 125 GeV in 2012 finalizes the Standard Model (SM) in the description of particle interactions at energies up to a few hundred GeV. All models predict the existence of new particles with masses approximately few TeV, candidate decay products (especially W, Z or H bosons reconstructed through hadronic decays) must have high transverse momenta. The VV → qqqq analysis [16] is performed only i√n the merged regime using 36.7 fb−1 of protonproton collision data at a centre-of-mass energy of s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. The leading jets are combined in pairs forming the Higgs candidates and requiring to pass ∆R and pT cuts which depend on invariant mass of HH system For both the boosted and the resolved analyses the dominant background is QCD multijet which is estimated in a side band region and validated in a control region in the mH1 , mH2 plane as shown in Figure 4(left), where mH refers to the invariant mass of the Higgs candidate. Good agreement is observed between the data and the background prediction (see Figure 4(right))
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