Determining the Structure of Higgs Couplings at the LHC

TL;DR

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 bosons, via the tensor structure of its coupling to weak bosons.

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.

Figures (4)

• Figure 1: Azimuthal angle distribution between the two tagging jets for the signal and dominant $\tau\tau$ backgrounds, $m_H = 120$ GeV. Cross sections for the D5 operators correspond to $\Lambda_5=480$ GeV, which reproduces the SM cross section, after cuts as in Eq.(\ref{['eq:cuts']}) and Ref. wbf_ll. The expected SM background is added to all three Higgs curves.
• Figure 2: Normalized distributions of the azimuthal angle between the two tagging jets, for the $H\to WW\to e\mu/\!\!\!p_T$ signal at $m_H = 160$ GeV. Curves are for the SM and for single D5 operators as given in Eq. (\ref{['eq:d5']}), after cuts as in Eq.(\ref{['eq:cuts']}) and Ref. wbf_ww.
• Figure 3: Azimuthal jet angle distribution for the SM and interference with a CP even D5 coupling. The two curves for each sign of the operator correspond to values $\sigma/\sigma_{\rm SM}=0.04,1.0$. Error bars for the signal and the dominant backgrounds correspond to an integrated luminosity of 100 fb${}^{-1}$ per experiment, distributed over 6 bins, and are statistical only.
• Figure 4: Comparison of the sensitivity of a total cross section (counting) experiment and the azimuthal angle asymmetry, Eq.(\ref{['eq:asy']}), to the presence of a CP even D5 coupling. The horizontal lines represent one sigma statistical deviations from the SM value. The secondary axes show the corresponding values of $\Lambda_5$ and $\Lambda_6$, as defined in Eqs.(\ref{['eq:d6']},\ref{['eq:d5']}).