Resolving gluon fusion loops at current and future hadron colliders

Abstract

Inclusive Higgs measurements at the LHC have limited resolution on the gluon fusion loops, being unable to distinguish the long-distance contributions mediated by the top quark from possible short-distance new physics effects. Using an Effective Field Theory (EFT) approach we compare several proposed methods to lift this degeneracy, including $t\bar{t}h$ and boosted, off-shell and double Higgs production, and perform detailed projections to the High-Luminosity LHC and a future hadron collider. In addition, we revisit off-shell Higgs production. Firstly, we point out its sensitivity to modifications of the top-$Z$ couplings, and by means of a general analysis we show that the reach is comparable to that of tree-level processes such as $t\bar{t}Z$ production. Implications for composite Higgs models are also discussed. Secondly, we assess the regime of validity of the EFT, performing an explicit comparison for a simple extension of the Standard Model containing one vector-like quark.

17 pages + appendices and references; v2: reference list extended and note added. Version published in JHEP; v3: mistake corrected in double Higgs production contours of Fig. 1. Minor modifications to the related discussion, conclusions unchanged

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Cited by in corpus (27)

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• Higgs boson potential at colliders: status and perspectives
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• Boosting $H\to b\bar{b}$ with Machine Learning
• The electro-weak couplings of the top and bottom quarks -- global fit and future prospects
• Anatomy of $b\to c\tau \nu$ anomalies
• Modeling BSM effects on the Higgs transverse-momentum spectrum in an EFT approach
• Higgs Physics: It ain't over till it's over
• New features in the JHU generator framework: constraining Higgs boson properties from on-shell and off-shell production
• Diboson at the LHC vs LEP
• Higgs Couplings without the Higgs
• Evaluating two-loop non-planar master integrals for Higgs + jet production with full heavy-quark mass dependence
• Two-loop helicity amplitudes for $gg\to ZZ$ with full top-quark mass effects
• NLO Corrections to Light-Quark Mixed QCD-EW Contributions to Higgs Production
• The complete set of two-loop master integrals for Higgs + jet production in QCD
• Approaching robust EFT limits for CP-violation in the Higgs sector
• Higgs boson production at large transverse momentum within SMEFT: analytical results
• Probing $Zt\bar{t}$ couplings using $Z$ boson polarization in $ZZ$ production at hadron colliders
• Top quark mass effects in $gg\to ZZ$ at two loops and off-shell Higgs interference
• The anomalous $Zb\bar{b}$ couplings: From LEP to LHC
• Diboson production in the SMEFT from gluon fusion
• Probing composite Higgs boson substructure at the HL-LHC
• Planar master integrals for the two-loop light-fermion electroweak corrections to Higgs plus jet production
• Composite Higgs at high transverse momentum
• Probing anomalous Higgs boson couplings in Higgs plus jet production at NLO QCD with full $m_t$-dependence
• Impact of fermionic operators on the Higgs width measurement