Combined analysis of double Higgs production via gluon fusion at the HL-LHC in the effective field theory approach

Abstract

We perform the combined analysis of the double Higgs production via gluon fusion in the $b\bar{b}\gamma \gamma$ and $b\bar{b}{\tau }^{+}{\tau }^{-}$ decay channels at the High-Luminosity LHC (HL-LHC). To validate our analysis, we reproduce the ATLAS result of the $b\bar{b}\gamma \gamma$ process including all contributions from fakes. For the $b\bar{b}{\tau }^{+}{\tau }^{-}$ decay channel, we perform the similar analysis to the CMS one. As an improvement, we also perform the multivariate analysis employing the boosted decision tree algorithm. Then, we derive 68% probability contours on anomalous Higgs couplings in the effective field theory (EFT) approach for various analyses. We find that the $b\bar{b}{\tau }^{+}{\tau }^{-}$ process outperforms the $b\bar{b}\gamma \gamma$ for the measurement of energy-growing operators, while adding the $b\bar{b}{\tau }^{+}{\tau }^{-}$ process is least beneficial for improving the precision of the Higgs self-coupling (mainly set by the $b\bar{b}\gamma \gamma$ process). We illustrate that the double Higgs production alone can be comparable to the single Higgs process in constraining the modification of the top Yukawa coupling in the positive direction. Focusing on the Higgs self-coupling as a special interest, we derive the precision as a function of various improvable parameters such as tag and mistag rates of tau leptons, heavy flavor jets, photon identification, diphoton mass resolution, and jet energy resolution to take into account future phenomenological studies. As an optimistic benchmark scenario, we illustrate that the 68% and 95% probability intervals of the Higgs self-coupling, ${\lambda }_3/{\lambda }_3^{SM}$, at the HL-LHC can reach $[0.2,2.3]$ and $[-0.1,3.5]\cup [4.0,6.5]$, respectively, where the correlation among the EFT coefficients is taken into account.

arXiv comment44 pages, 23 figures, v3: version accepted to PRD, typos corrected, references added, new benchmark point for optimistic HL-LHC chosen (Figs.19, 20 and Table V updated), Appendix B added (along with new Figs. 22, 23)

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• Higgs-boson-pair production $H(\to b\overline{b})H(\to \gamma \gamma )$ from gluon fusion at the HL-LHC and HL-100 TeV hadron collider
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• Probing Quartic Higgs Self-Interaction
• Probing the Triple Higgs Self-Interaction at the Large Hadron Collider
• Probing the Higgs self-coupling through double Higgs production in vector boson scattering at the LHC
• Resolving the degeneracy in top quark Yukawa coupling with Higgs pair production
• Multi-Higgs Production and Unitarity in Vector-Boson Fusion at Future Hadron Colliders
• A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory
• Portraying Double Higgs at the Large Hadron Collider II
• Prospects of non-resonant di-Higgs searches and Higgs boson self-coupling measurement at the HE-LHC using machine learning techniques
• The Natural TeV Cutoff of the Higgs Field from the Multiplicative Lagrangian
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• Measuring Higgs Boson Self-couplings with $2\to 3$ VBS Processes
• Probing the trilinear Higgs boson self-coupling via single Higgs production at the LHeC
• Indirect measurement of triple-Higgs coupling at an electron-positron collider with polarized beams
• Investigating Higgs self-interaction through di-Higgs plus jet production
• Prospects for exotic $h\to 4\tau$ decays in single and di-Higgs boson production at the LHC and future hadron colliders