Strong Higgs interactions at a linear collider

Contino, Roberto; Grojean, Christophe; Pappadopulo, Duccio; Rattazzi, Riccardo; Thamm, Andrea

doi:10.1007/jhep02(2014)006

Cited by 86 publications

(95 citation statements)

References 174 publications

(305 reference statements)

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“…give the leading corrections in strongly coupled Higgs scenarios [26,27]. 2 In the electroweak breaking vacuum and after performing a field rescaling for a canonically normalized Higgs kinetic term, Eq.…”

Section: B Rescaled H 3 and Hzz Sm Couplingsmentioning

confidence: 99%

Indirect model-dependent probe of the Higgs self-coupling

2014

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The Higgs associated production cross section at an e þ e − collider is indirectly sensitive to the Higgs self-coupling, h 3 , at next-to-leading order (NLO). Utilizing this, a new indirect method is proposed for constraining deviations in the self-coupling below the di-Higgs production threshold in certain models. Although this indirect constraint is model dependent, making it valid only under specific assumptions, meaningful indirect constraints on the self-coupling may be realized. Specific realistic scenarios where the indirect constraint applies are discussed and in particular it is shown that in the well-motivated class of two Higgs-doublet models there exist regions of parameter space in which the NLO effects from a modified self-coupling dominate over the leading order modifications, demonstrating a concrete scenario in which large modifications of the Higgs self-coupling may be indirectly constrained using the proposed method. Other models, such as strongly coupled scenarios, are also discussed. The indirect method would give valuable constraints on deviations in the Higgs self-coupling, and would be complementary to the direct measurements possible with di-Higgs production at other colliders, providing precious additional information in the effort to unravel the properties of the Higgs boson.

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Section: B Rescaled H 3 and Hzz Sm Couplingsmentioning

confidence: 99%

Indirect model-dependent probe of the Higgs self-coupling

2014

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“…If one were to find that single-Higgs processes violate these constraints, this would be an indication that the Higgs is not part of a doublet. Furthermore, processes with double Higgs boson production can be predicted to a certain extent in terms of single-Higgs couplings, and can thus be used to probe the nature of the Higgs boson [75].…”

Section: Jhep07(2013)035mentioning

confidence: 99%

Effective Lagrangian for a light Higgs-like scalar

Contino¹,

Ghezzi²,

Grojean

et al. 2013

J. High Energ. Phys.

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339

394

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Abstract:We reconsider the effective Lagrangian that describes a light Higgs-like boson and better clarify a few issues which were not exhaustively addressed in the previous literature. In particular we highlight the strategy to determine whether the dynamics responsible for the electroweak symmetry breaking is weakly or strongly interacting. We also discuss how the effective Lagrangian can be implemented into automatic tools for the calculation of Higgs decay rates and production cross sections.

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“…However we can already estimate that if such sensitivity is possible it can take place only at high luminocities and/or high energies for quite large values of the a parameter. A detailed analysis of these processes at future e + e − colliders is being performed in [19].…”

Section: Jhep05(2013)005mentioning

confidence: 99%

Multiple Higgs and vector boson production beyond the Standard Model

Belyaev

Oliveira

Rosenfeld

et al. 2013

J. High Energ. Phys.

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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 → 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.

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Strong Higgs interactions at a linear collider

Cited by 86 publications

References 174 publications

Indirect model-dependent probe of the Higgs self-coupling

Indirect model-dependent probe of the Higgs self-coupling

Effective Lagrangian for a light Higgs-like scalar

Multiple Higgs and vector boson production beyond the Standard Model

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