Higgs + 2 Jets as a Probe for CP Properties

Abstract

Azimuthal angle correlations of the jets in Hjj events at the LHC provide a probe of the CP nature of Higgs couplings to gauge bosons. In weak boson fusion the HWW and HZZ couplings are tested. Gluon fusion processes probe the tensor structure of the effective Hgg vertex and thus the CP nature of the dominant quark couplings.

Figures (3)

• Figure 1: Left: Normalized distributions of the azimuthal angle between the two tagging jets, for the $\Phi\to WW\to e\mu\text{$p$\space\space$\diagup$\space\space}_T$ signal in vector boson fusion at $m_\Phi = 160$ GeV, from Ref. Plehn:2001nj. Curves are for the SM and for single D5 operators as given in Eq. (\ref{['eq:d5']}), after cuts as in Ref. Rainwater:1999sd. Right: The same for Higgs production in gluon fusion at $m_\Phi=120$ GeV. Curves are for CP-even and CP-odd $\Phi tt$ coupling.
• Figure 2: Normalized distributions of the tagging jets in EW vector boson fusion with anomalous couplings and for a Higgs mass of $m_\Phi =120$ GeV. Typical VBF cuts of $p_{Tj} > 30\, {\rm GeV}, |\eta_j| < 4.5,\ |\eta_{j_1}-\eta_{j_2}| > 4.0,\ m_{jj} > 600~{\rm GeV}$ are applied. Left: Azimuthal angle distribution between the two tagging jets, for different strengths of the operators of Eq. (\ref{['eq:d5']}). Right: Transverse momentum distribution of the hardest tagging jet for $f_e = f_o = 1$ and a form factor as in Eq. (\ref{['eqn:C0']}). The "no formfactor" curve corresponds to the limit $M\to\infty$, i.e. a constant $a_i$.
• Figure 3: Distribution of the azimuthal angle between the tagging jets in $\Phi jj$ events for a CP-even $\Phi tt$ coupling ( left) and a CP-odd coupling ( right). Shown are expected signal and background events per 10 degree bin for $\Phi \rightarrow W^+W^-\rightarrow \ell^+\ell^-\nu\bar{\nu}$ and ${\cal L}_{int}=30\,{\rm fb}^{-1}$ for the cuts of Eqs. (\ref{['eqn:incl']}, \ref{['eqn:sel']}, \ref{['eqn:eta']}) and an applied b-veto. Processes from top to bottom: gluon fusion (signal), VBF, $t\bar{t}$, $t\bar{t}j$, $t\bar{t}jj$, QCD $WWjj$. $m_{\Phi}=160$ GeV is assumed.