Multi Higgs and Vector boson production beyond the Standard Model

TL;DR

This paper investigates how deviations in Higgs couplings from the Standard Model can lead to significant enhancements in multi-particle production processes at high energies, especially in triple Higgs production, with implications for LHC searches.

Contribution

It introduces the study of multi-Higgs and vector boson production beyond the Standard Model, highlighting the potential for large deviations in multiparticle channels due to modified Higgs couplings.

Findings

Large enhancements in multiparticle production amplitudes due to small Higgs coupling deviations.

Triple Higgs production identified as the most sensitive channel for detecting these deviations.

Implications for LHC experiments to search for new physics in multiparticle final states.

Abstract

If the electroweak symmetry breaking is originated from a strongly coupled sector, as for instance in composite Higgs models, the Higgs boson couplings can deviate from their Standard Model values. In such cases, at sufficiently high energies there could occur an onset of multiple Higgs boson and longitudinally polarised electroweak gauge boson (V_L) production. We study the sensitivity to anomalous Higgs couplings in inelastic processes with 3 and 4 particles (either Higgs bosons or V_L's) in the final state. We show that, due to the more severe cancellations in the corresponding amplitudes as compared to the usual 2 to 2 processes, large enhancements with respect to the Standard Model can arise even for small modifications of the Higgs couplings. In particular, we find that triple Higgs production provides the best multiparticle channel to look for these deviations. We briefly explore the consequences of multiparticle production at the LHC.