Abstract
A search for the Standard Model Higgs boson produced in association with a vector boson with the decay $H\rightarrow \tau\tau$ is presented. The data correspond to 20.3 fb$^{-1}$ of integrated luminosity from proton-proton collisions at $\sqrt{s} = 8$ TeV recorded by the ATLAS experiment at the LHC during 2012. The data agree with the background expectation, and 95% confidence-level upper limits are placed on the cross section of this process. The observed (expected) limit, expressed in terms of the signal strength $\mu = \sigma/\sigma_{\mathrm{SM}}$ for $m_\mathrm{H} = 125 GeV$, is $\mu <$ 5.6 (3.7). The measured value of the signal strength is $\mu = 2.3\pm1.6$.
Highlights
The investigation of the origin of electroweak symmetry breaking and the experimental confirmation of the BroutEnglert-Higgs mechanism [1,2,3,4,5,6] is one of the primary goals of the physics program at the Large Hadron Collider (LHC) [7]
The analysis presented here utilizes τhad candidates seeded by an anti-kt jet algorithm with radius parameter R 1⁄4 0.4 [25,26], with jet pT > 20 GeV and jηj < 2.5
Electron candidates are reconstructed from clusters of energy deposited in the electromagnetic calorimeter that are matched to tracks in the inner detector
Summary
The investigation of the origin of electroweak symmetry breaking and the experimental confirmation of the BroutEnglert-Higgs mechanism [1,2,3,4,5,6] is one of the primary goals of the physics program at the Large Hadron Collider (LHC) [7]. A search for the associated production of the Higgs boson with a vector boson, where the Higgs boson decays to a pair of tau leptons, is presented. This production mechanism is referred to in the following as VH, where V is either a W or Z boson. The analysis is part of a comprehensive program by the ATLAS Collaboration at the LHC to measure the Higgs boson production mechanisms, its couplings, and other characteristics. The H → τþτ− decay signal is reconstructed in the following two possible final states: both tau leptons decay to hadrons and a neutrino (τhadτhad), or one tau lepton decays leptonically (τ → lνν) and one to hadron(s) and a neutrino (τlepτhad)
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