Search for charged Higgs bosons in the H ± → tb decay channel in pp collisions at s = 8 √(s)=8 TeV using the ATLAS detector

2015/12/31 by ATLAS Collaboration, G. Aad, B. Abbott +98
Physics and Astronomy · #ATLAS experiment #Atlas (anatomy) #Boson #Branching fraction #Hadron #Higgs boson #High-Energy Particle Collisions Research #Large Hadron Collider #Muon #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Standard Model (mathematical formulation) #Top quark #hep-ex

paper · pdf · doi:10.1007/jhep03(2016)127

published as JHEP03(2016)127 · 32 pages plus author list (48 pages total), 10 figures, 4 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-28/

openalex publication_date 2016/03/01 · arxiv created 2016/03/24 · arxiv updated 2016/03/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06

Abstract

Charged Higgs bosons heavier than the top quark and decaying via H tb are searched for in proton-proton collisions measured with the ATLAS experiment at s = 8 TeV corresponding to an integrated luminosity of 20.3 fb -1 . The production of a charged Higgs boson in association with a top quark, gb tH , is explored in the mass range 200 to 600 GeV using multi-jet final states with one electron or muon. In order to separate the signal from the Standard Model background, analysis techniques combining several kinematic variables are employed. An excess of events above the backgroundonly hypothesis is observed across a wide mass range, amounting to up to 2.4 standard deviations. Upper limits are set on the gb tH production cross section times the branching fraction BR(H tb). Additionally, the complementary s-channel production, qq H , is investigated through a reinterpretation of W tb searches in ATLAS. Final states with one electron or muon are relevant for H masses from 0.4 to 2.0 TeV, whereas the all-hadronic final state covers the range 1.5 to 3.0 TeV. In these search channels, no significant excesses from the predictions of the Standard Model are observed, and upper limits are placed on the qq H production cross section times the branching fraction BR(H tb).

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