Abstract
The prospects for the measurement of the tensor structure of the vertex between a standard model Higgs boson and two weak gauge bosons using the distribution of the azimuthal angles between the two tagging jets in the weak boson fusion channel are studied in a Monte Carlo analysis using the fast simulation of the ATLAS detector. The decay channels H→τ+τ-→ll+4ν, H→τ+τ-→lh+3ν at mH=120 GeV and H→W+W-→llνν at mH=160 GeV are used in the analysis. For a standard model Higgs boson it is found that purely anomalous couplings are expected to be excluded at a confidence level corresponding to 2σ or more at mH=120 GeV and more than 5σ at mH=160 GeV from 30 fb-1 of data. With a value of 1 roughly reproducing the standard model cross section for a purely anomalous coupling, the standard deviation in a measurement of a contribution of a CP even anomalous coupling in addition to the standard model coupling is estimated to be 0.20 at mH=120 GeV and 0.09 at mH=160 GeV.
Highlights
One of the main purposes of the ATLAS experiment is the investigation of the predicted effects of electroweak symmetry breaking and the description of particle masses in the standard model
In a step, its quantum numbers and couplings will be investigated. It has been proposed [2] to use the distribution of the azimuthal angles between the tagging jets in weak boson fusion to determine the structure of the coupling of a scalar Higgs particle candidate to two weak bosons
The version of ATLFAST used in ATHENA 10.0.1 has not been formally validated within the ATLAS collaboration and, albeit being considered as appropriate for this study, results obtained using this version cannot be compared directly to other ATLAS results
Summary
One of the main purposes of the ATLAS experiment is the investigation of the predicted effects of electroweak symmetry breaking and the description of particle masses in the standard model. This measurement can be used to determine the CP quantum number of the scalar particle and it can be used to decide whether the coupling is loop-induced or standard model-like. In the second part of the analysis the sensitivity of the ATLAS experiment to a contribution by an anomalous coupling in addition to the standard model coupling is estimated using a likelihood fit. This note is based on the results of [3] (in German)
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