Abstract
A search for charged Higgs bosons decaying into W±W± or W±Z bosons is performed, involving experimental signatures with two leptons of the same charge, or three or four leptons with a variety of charge combinations, missing transverse momentum and jets. A data sample of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider between 2015 and 2018 is used. The data correspond to a total integrated luminosity of 139 fb−1. The search is guided by a type-II seesaw model that extends the scalar sector of the Standard Model with a scalar triplet, leading to a phenomenology that includes doubly and singly charged Higgs bosons. Two scenarios are explored, corresponding to the pair production of doubly charged H±± bosons, or the associated production of a doubly charged H±± boson and a singly charged H± boson. No significant deviations from the Standard Model predictions are observed. H±± bosons are excluded at 95% confidence level up to 350 GeV and 230 GeV for the pair and associated production modes, respectively.
Highlights
Background estimationThe background sources can be divided into two main categories
The analysis only considers muons with pT > 10 GeV satisfying the ‘Medium’ quality requirements defined in ref
Background from W W production is estimated from simulation if the two W bosons have the same electric charge and from data if the two W bosons have opposite electric charge, since the latter only contributes through electron charge-flip and non-prompt leptons
Summary
The production cross sections for H±± pair production with the same mass settings as for associated production of H±± and H± bosons can be large This production mode is exactly the one described in the first scenario and it is not considered in the second scenario. For the H±± pair production mode, the mixing between the CP-even scalars is taken to be 10−4 and the remaining five couplings in the potential are adjusted to obtain a given H±± boson mass hypothesis while requiring h0 to have a mass of 125 GeV. The CMS collaboration published results for the H±± → W ±W ± decay mode in the context of single H±± production through vector-boson fusion with vt values of a few tens of GeV, for a model with two Higgs triplets [44,45,46]. A direct search for H±± pair production with decays to W ±W ± pairs has been performed on a smaller data set by the ATLAS collaboration [23], validating the principle of such an approach
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