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Higgs plus two jet production via gluon fusion as a signal at the CERN LHC

G. Klamke, D. Zeppenfeld

TL;DR

The paper investigates Higgs boson production in association with two jets at the LHC, comparing gluon-fusion and vector-boson-fusion channels for m_H=160 GeV with H→W^+W^− decays. Using LO, parton-level calculations with an effective Hgg vertex that includes CP-even and CP-odd components, it assesses backgrounds from tar t+jets and WW+jj processes and develops a cut-based strategy to extract a significant GF signal (S/B ~ 1/4) with 30 fb^{-1}. It demonstrates that azimuthal correlations between tagging jets, ΔΦ_{jj}, are a powerful probe of the CP structure of the Htt Yukawa coupling, allowing discrimination between CP-even, CP-odd, and mixed couplings, with projected ~6σ sensitivity for 30 fb^{-1} under favorable conditions. The study emphasizes that detector effects and higher-order corrections will refine these results, but the approach provides a viable path to CP measurements and Higgs property analyses at the LHC across gluon-fusion and VBF channels.

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.

Higgs plus two jet production via gluon fusion as a signal at the CERN LHC

TL;DR

The paper investigates Higgs boson production in association with two jets at the LHC, comparing gluon-fusion and vector-boson-fusion channels for m_H=160 GeV with H→W^+W^− decays. Using LO, parton-level calculations with an effective Hgg vertex that includes CP-even and CP-odd components, it assesses backgrounds from tar t+jets and WW+jj processes and develops a cut-based strategy to extract a significant GF signal (S/B ~ 1/4) with 30 fb^{-1}. It demonstrates that azimuthal correlations between tagging jets, ΔΦ_{jj}, are a powerful probe of the CP structure of the Htt Yukawa coupling, allowing discrimination between CP-even, CP-odd, and mixed couplings, with projected ~6σ sensitivity for 30 fb^{-1} under favorable conditions. The study emphasizes that detector effects and higher-order corrections will refine these results, but the approach provides a viable path to CP measurements and Higgs property analyses at the LHC across gluon-fusion and VBF channels.

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 signal at GeV, with subsequent leptonic decay of the -pair. The dominant backgrounds from top-quark pair production, production and vector boson fusion processes can be suppressed to a level of , yielding a highly significant gluon fusion signal with 30 fb. Analysis of the azimuthal angle correlations of the two jets provides for a direct measurement of the CP-nature of the Yukawa coupling which is responsible for the effective vertex.

Paper Structure

This paper contains 10 sections, 22 equations, 11 figures, 3 tables.

Table of Contents

  1. Introduction
  2. Calculational tools
  3. The $H + jj$ signal process
  4. The QCD $t\bar{t} + jets$ backgrounds
  5. The EW $WW+jj$ background
  6. The QCD $WW+jj$ background
  7. Cross sections at the LHC
  8. Azimuthal angle correlations
  9. Conclusions
  10. Acknowledgments

Figures (11)

  • Figure 1: Feynman graphs contributing to $pp\to Hjj$.
  • Figure 2: Normalized rapidity separation (left) and dijet invariant mass (right) distribution of the two tagging jets for the signal (solid) and backgrounds: EW $W^+W^-jj$ (dash-dotted), $t\bar{t}+jets$ (dashed) and QCD $W^+W^-jj$ (dotted). The cuts of Eq. (\ref{['eqn:incl']}) are imposed.
  • Figure 3: Left: Normalized transverse momentum distribution of the $b$-quarks for $t\bar{t}$ (solid), $t\bar{t}+j$ (dashed) and $t\bar{t}+jj$ (dotted). Right: Normalized distribution of the missing transverse momentum for signal and backgrounds as in Fig. \ref{['fig:etajj']}. The cuts of Eq. (\ref{['eqn:incl']}) are imposed.
  • Figure 4: Normalized distributions of the charged leptons R-separation (left) and dilepton invariant mass (right) after cuts of Eq. (\ref{['eqn:incl']}) for signal and background as in Fig. \ref{['fig:etajj']}.
  • Figure 5: Normalized distributions of the minimum charged lepton $p_T$ for inclusive cuts of Eq. (\ref{['eqn:incl']}) (left) and after the additional $\Delta R_{\ell\ell}$ and $m_{\ell\ell}$ cuts of Eq. (\ref{['eqn:mll']}) (right). Curves are for signal and backgrounds as in Fig. \ref{['fig:etajj']}.
  • ...and 6 more figures