Search for the Standard Model Higgs boson in the decay channel $H \to ZZ^{(*)} \to 4 \ell$ with 4.8 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=7$ TeV with ATLAS

Tanasijczuk, Andres Jorge;ATLAS;et.al.
(2012) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 710, p. 383 (2012)

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This Letter presents a search for the Standard Model Higgs boson in the decay channel H→ZZ(⁎)→ℓ+ℓ−ℓ′+ℓ′− , where ℓ,ℓ′=e or μ , using proton–proton collisions at s=7 TeV marc:recorded with the ATLAS detector and corresponding to an integrated luminosity of 4.8 fb −1 . The four-lepton invariant mass distribution is compared with Standard Model background expectations to derive upper limits on the cross section of a Standard Model Higgs boson with a mass between 110 GeV and 600 GeV. The mass ranges 134–156 GeV, 182–233 GeV, 256–265 GeV and 268–415 GeV are excluded at the 95% confidence level. The largest upward deviations from the background-only hypothesis are observed for Higgs boson masses of 125 GeV, 244 GeV and 500 GeV with local significances of 2.1, 2.2 and 2.1 standard deviations, respectively. Once the look-elsewhere effect is considered, none of these excesses are significant.
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Tanasijczuk, A. J., ATLAS, & et al. (2012). Search for the Standard Model Higgs boson in the decay channel $H \to ZZ^{(*)} \to 4 \ell$ with 4.8 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=7$ TeV with ATLAS. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 710, 383. https://doi.org/10.1016/j.physletb.2012.03.005 (Original work published 2012)