https://doi.org/10.1051/epjconf/20147100124
Measurements of properties of the Higgs-like boson in the H → ZZ(*) → 4ℓ decay channel using the ATLAS detector
University of Pennsylvania
a e-mail: stahlman@sas.upenn.edu
Published online: 29 April 2014
This article presents results on measurements of the signal strength, mass, and spin of the recently discovered Higgs-like boson in the H → ZZ(*) → 4ℓ decay channel using the ATLAS detector. The results are based on the combined dataset of the 2011 and 2012 LHC runs consisting of 4.6 fb−1 of ps √s = 7 TeV and 20.7 fb−1 of √s = 8 TeV proton-proton collision data. An excess of events is observed corresponding to mH = 124.3 GeV with a p0 value of 2.7 × 10−11 (6.6 standard deviations). The fit at this mass point yields a signal strength relative to the SM of 1.7−0.4+0.5 with mH = 124.3−0.5+0.6 (stat)−0.3+0.5 (syst) GeV. Tests of various spin-parity hypotheses are also presented, with the 0− and 1+ hypotheses being excluded versus the 0+ hypothesis at >97% confidence level.
© Owned by the authors, published by EDP Sciences, 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
