Article

Determining the structure of Higgs couplings at the CERN LargeHadron Collider.

Department of Physics, University of Wisconsin, Madison, Wisconsin, USA.
Physical Review Letters (Impact Factor: 7.73). 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.

0 Bookmarks
 · 
64 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We test the possibility that the newly-discovered 126 GeV boson is a pseudoscalar by examining the correlations among the loop-induced pseudoscalar decay branching fractions to $\gamma\gamma$, $ZZ^*$, $Z\gamma$, and $WW^*$ final states in a model-independent way. These four decays are controlled by only two effective operators, so that the rates in $Z\gamma$ and $WW^*$ are predicted now that the rates in $\gamma\gamma$ and $ZZ^*,Z\gamma^* \to 4 \ell$ have been measured. We find that the pseudoscalar possibility is disfavored but not conclusively excluded. Experimental exclusion of the $Z\gamma$ decay to well below $\sigma/\sigma_{\rm SM} \sim 170$ or conclusive observation of the $WW^*$ decay near the Standard Model rate would eliminate the pseudoscalar possibility. The $Z\gamma$ exclusion should be possible using existing data. The only loophole in our argument is the possibility that the $4\ell$ signal comes from pseudoscalar decays to a pair of new neutral gauge bosons with mass near the $Z$ pole.
    Physical review D: Particles and fields 08/2012; 86(7).
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Higgs boson production in association with two tagging jets will be mediated by electroweak vector boson fusion and by gluon fusion processes at the CERN LHC. The characteristic distributions for the gluon fusion process are analyzed for the $H\to W^+W^-$ signal at $m_H=160$ GeV, with subsequent leptonic decay of the $W$-pair. The dominant backgrounds from top-quark pair production, $WWjj$ production and vector boson fusion processes can be suppressed to a level of $S/B\approx 1/4$, yielding a highly significant gluon fusion signal with 30 fb$^{-1}$. Analysis of the azimuthal angle correlations of the two jets provides for a direct measurement of the CP-nature of the $Htt$ Yukawa coupling which is responsible for the effective $Hgg$ vertex. Comment: 19 pages, 21 figures
    Journal of High Energy Physics 03/2007; · 5.62 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We make a full tree level study of the signatures of anomalous gauge couplings of the Higgs boson at the CERN LHC via the semileptonic decay mode in WW scatterings, pp{yields}W{sup +}W{sup {+-}}j{sub 1}{sup f}j{sub 2}{sup f}{yields}l{sup +}{nu}{sub l}j{sub 1}j{sub 2}j{sub 1}{sup f}j{sub 2}{sup f}. Both signals and backgrounds are studied at the hadron level for the Higgs mass in the range 115 GeV{<=}m{sub H}{<=}200 GeV. We carefully impose suitable kinematical cuts for suppressing the backgrounds. To the same sensitivity as in the pure leptonic mode pp{yields}W{sup +}W{sup +}j{sub 1}{sup f}j{sub 2}{sup f}{yields}l{sup +}{nu}{sub l}l{sup +}{nu}{sub l}j{sub 1}{sup f}j{sub 2}{sup f}, our result shows that the semileptonic mode can reduce the required integrated luminosity by a factor of 3. If the anomalous couplings in nature are actually larger than the sensitivity bounds shown in the text, the experiment can start the test for an integrated luminosity of 50 fb{sup -1}.
    Physical review D: Particles and fields 03/2009; 79(5).

Full-text (2 Sources)

View
0 Downloads
Available from