Abstract
Measurements are presented of the production properties, couplings and spin- parity of the recently discovered Higgs-like boson using the decays into boson pairs, γγ, ZZ ∗ → 4� and WW ∗ → �ν�ν . The results shown here are based on the complete pp collision data sample recorded by the ATLAS experiment at the Large Hadron Collider (LHC) at centre-of-mass energies of √ s = 7 TeV and √ s = 8 TeV, and correspond to an integrated luminosity of about 25 fb −1 . Evidence for Higgs boson production through vector-boson fusion is reported. Results of combined fits probing Higgs boson couplings to fermions and bosons, as well as anomalous contributions of loop-induced production and decay modes, are presented. The spin-parity hypothesis J P = 0 + , predicted for the Standard Model Higgs boson, is compared to alternative hypotheses (J P = 0 − 1, 1 + ,1 − and 2 + ). All measurements are consistent with the Standard Model expectations of the Higgs boson.
Highlights
The discovery of a new particle with a mass of about 125 GeV in the search for the Standard Model (SM) Higgs boson at the CERN Large Hadron Collider (LHC) was reported in July 2012 by the ATLAS and CMS Collaborations[1]
√The results reported here are√based s = 7 TeV) and 2012, corresponding to integrated the ATLAS detector in 2011 luminosities of 4.7 fb−1 and
The Higgs boson production strength parameter μ, i.e., the ratio of the observed rate to the Standard Model expectation, is determined from a fit to the data using the profile likelihood ratio Λ(μ) for a fixed mass hypothesis corresponding to the measured value mH = 125.5 GeV
Summary
The discovery of a new particle with a mass of about 125 GeV in the search for the Standard Model (SM) Higgs boson at the CERN Large Hadron Collider (LHC) was reported in July 2012 by the ATLAS and CMS Collaborations[1]. The present experimental challenge is to compare its properties with those predicted by the Standard Model. This proceeding presents measurements of the main properties of the newly observed particle, including its mass, production strengths and couplings to fermions and bosons, as well as spin and parity, using diboson final states: γγ, ZZ∗ → 4 and WW∗ → ν ν.
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