Search for a doubly charged Higgs boson decaying to same-sign W bosons in a triplet-doublet extension of the standard model with the Atlas detector at the LHC

Abstract : A search for doubly charged scalar bosons decaying to W boson pairs is performed using a data sample corresponding to an integrated luminosity of 36.1 fb$^{-1}$ collected by the ATLAS detector at the LHC at a centre-of-mass energy of 13 TeV in 2015 and 2016. The search is guided by a model including an extension of the scalar sector through a scalar triplet which provides an explanation of neutrino masses. Such a model predicts a rich phenomenology that includes singly- and doubly-charged bosons, and two new neutral bosons, besides a boson whose properties are identical to the SM Higgs boson. The doubly-charged bosons are produced by pairs in proton-proton collisions and decay predominantly into W bosons. The mass range from 200 to 700 GeV is explored using experimental signatures including several leptons, missing transverse energy and jets. The analysis in the final state of three leptons is described in this thesis. A combination of the analysis in two, three, and four leptons is used to enhance sensitivity. A statistical interpretation of the results gives an observed lower bound on the mass of 220 GeV. This is the first search of this model in this parameter space at the colliders.
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Venugopal Ellajosyula. Search for a doubly charged Higgs boson decaying to same-sign W bosons in a triplet-doublet extension of the standard model with the Atlas detector at the LHC. High Energy Physics - Experiment [hep-ex]. AMU Aix Marseille Université, 2017. English. ⟨tel-02279535⟩

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