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. This chapter studies 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. It is shown 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, triple Higgs production provides the best multiparticle channel to look for these deviations. The consequences of multiparticle production at the LHC is briefly explored.
The original version of this chapter was revised: For detailed information please see Erratum. The erratum to this chapter is available at 10.1007/978-3-319-43452-0_7.
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Notes
- 1.
With such large deviations still possible, you may ask why is this hailed as such a success for the standard model. The reason is that the masses and related couplings vary over many orders of magnitude between particles, and in this context a \(\sim \)30 % deviation is very small.
- 2.
Although it should be noted that these models are strongly tuned and do not solve the gauge hierarchy problem.
- 3.
- 4.
At the time of this study, 33 TeV was being discussed as a possible energy for the High Energy LHC upgrade. Now the possibility of a 100 TeV collider is being considered for which we are updating these results [28].
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Thomas, M.C. (2016). Multiple Higgs and Vector Boson Production. In: Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-43452-0_2
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