Article

Determining the Structure of Higgs Couplings at the CERN Large Hadron Collider

Department of Physics, University of Wisconsin, Madison, Wisconsin, USA.
Physical Review Letters (Impact Factor: 7.51). 03/2002; 88(5):051801. DOI: 10.1103/PhysRevLett.88.051801
Source: PubMed

ABSTRACT Higgs boson production via weak boson fusion at the CERN Large Hadron Collider has the capability to determine the dominant CP nature of a Higgs boson, via the tensor structure of its coupling to weak bosons. This information is contained in the azimuthal angle distribution of the two outgoing forward tagging jets. The technique is independent of both the Higgs boson mass and the observed decay channel.

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    • "By distinguishing between the CP even and the CP odd coupling terms one obtains information about the CP quantum number of the particle and by distinguishing between the standard model coupling term and the anomalous coupling terms one can test whether the coupling exists at leading order or is mediated by particle loops. In this section a hypothesis test is described in which the shape of the distribution of the azimuthal angles between the tagging jets ∆φ jj is used, as suggested in [2], to distinguish between the different couplings. The method is applied to the case of a standard model Higgs boson for which the prospects for the experimental exclusion of the anomalous couplings are investigated. "
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    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=120GeV and H→W+W-→llνν at mH=160GeV 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=120GeV and more than 5σ at mH=160GeV from 30fb-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=120GeV and 0.09 at mH=160GeV.
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