Abstract

A search is presented for new particles in an extension to the Standard Model that includes a heavy Higgs boson H0, an intermediate charged Higgs boson pair H+-, and a light Higgs boson h0. The analysis searches for events involving the production of a single heavy neutral Higgs boson which decays to the charged Higgs boson and a W boson, where the charged Higgs boson subsequently decays into a W boson and the lightest neutral Higgs boson decaying to a bottom--antibottom-quark pair. Such a cascade results in a W-boson pair and a bottom--antibottom-quark pair in the final state. Events with exactly one lepton, missing transverse momentum, and at least four jets are selected from a data sample corresponding to an integrated luminosity of 20.3/fb, collected by the ATLAS detector in proton--proton collisions at sort(s)=8 TeV at the LHC. The data are found to be consistent with Standard Model predictions, and 95% confidence-level upper limits are set on the product of cross section and branching ratio. These limits range from 0.065 pb to 43 pb as a function of H0 and H+- masses, with m(h0) fixed at 125 GeV.

Highlights

  • A Higgs boson has been discovered by the ATLAS [1] and CMS [2] Collaborations with a mass of approximately 125 GeV

  • The W=Z-boson þ jets contribution is simulated using ALPGEN interfaced to HERWIG/JIMMY, and is normalized to next-to-next-to-leading order (NNLO) theoretical cross sections [44,45]

  • The contribution from single top-quark production is simulated using Monte Carlo (MC)@next-to-leading order (NLO) interfaced to HERWIG/JIMMY for the s-channel top-quark production and Wt production, and with AcerMC interfaced to PYTHIA for the t channel, and normalized to approximate NNLO theoretical cross sections [46,47,48]

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Summary

INTRODUCTION

A Higgs boson has been discovered by the ATLAS [1] and CMS [2] Collaborations with a mass of approximately 125 GeV This observation has been supported by complementary evidence from the CDF and D0 Collaborations [3]. Other production modes, such as associated production or vectorboson fusion lead to different final states and are not considered here.

ATLAS DETECTOR AND DATA SAMPLE
SIGNAL AND BACKGROUND SIMULATION
EVENT SELECTION
Event reconstruction
Multivariate analysis
BACKGROUND
SYSTEMATIC UNCERTAINTIES
Background
Findings
VIII. RESULTS
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