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]
Summary
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.
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