MARC VIII Proceedings: Introduction

Glover, S. E.

doi:10.1007/s10967-009-0338-6

Cited by 15 publications

(25 citation statements)

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“…These are not fully reflected by ad-hoc rescalings of the Higgs self-coupling. Tree-level modifications λ H /λ SM H are visible through threshold effects [49][50][51][52] (see also [46]). Effects of this type need to be contrasted with coherent Higgs coupling changes [53,54] that drive the destructive interference between the diagrams in Fig.…”

Section: Resultsmentioning

confidence: 99%

Probing the symmetric Higgs portal with di-Higgs boson production

Englert

Jaeckel

2019

Phys. Rev. D

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A coupling of a scalar with an unbroken U(1) symmetry to the Standard Model via the Higgs portal is one of the simplest gateways to a dark sector. Yet, for masses mS ≥ mH /2 there are few probes of such an interaction. In this note we evaluate the sensitivity of di-Higgs production at the LHC as well as at a future FCC-hh, taking into account the full momentum dependence of the process. This significantly impacts the sensitivity compared to estimates of changes in the Higgs-coupling based on the effective potential. We also compare our findings to precision single Higgs probes such as the cross section for associated production at a future lepton collider, e.g. FCC-ee, as well as searches for missing energy.

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Section: Resultsmentioning

confidence: 99%

Probing the symmetric Higgs portal with di-Higgs boson production

Englert

Jaeckel

2019

Phys. Rev. D

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“…the top quark Yukawa coupling can be modified compared to the SM [85]. Both these effects are relevant for di-Higgs production and we include them to a one-loop computation of gg → HH production [1,3,86]. We furthermore estimate the importance of the heavier states that arise in this scenario by means of the low energy effective theorem, but find that they do not significantly impact our result and their contribution is in the percent-range, below the expected theoretical uncertainty.…”

Section: Di-higgs Physicsmentioning

confidence: 99%

Phenomenology of GUT-inspired gauge-Higgs unification

2020

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We perform a detailed investigation of a Grand Unified Theory (GUT)-inspired theory of gauge-Higgs unification. Scanning the model's parameter space with adapted numerical techniques, we contrast the scenario's low energy limit with existing SM and collider search constraints. We discuss potential modifications of di-Higgs phenomenology at hadron colliders as sensitive probes of the gauge-like character of the Higgs self-interactions and find that for phenomenologically viable parameter choices modifications of the order of 20% compared to the SM cross section can be expected. While these modifications are challenging to observe at the LHC, a future 100 TeV hadron collider might be able to constrain the scenario through more precise di-Higgs measurements. We point out alternative signatures that can be employed to constrain this model in the near future.1 A SU (6)-based scenario was discussed in [30], also demonstrating that proton decay can be avoided. 2 A different variant of evolutionary algorithms, namely genetic algorithms, have been employed in the exploration of viable string theory scenarios and the pMSSM in [33,34].

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“…We now discuss the effect of these corrections on continuum Higgs pair production. At the LHC the dominant process is given by gluon fusion [121,126,128,129]. The contributing diagrams are the triangle diagrams with the production of a Higgs or Z boson that subsequently decays into a Higgs pair, and the box diagrams [88].…”

Section: The Benchmark Scenario Bp3hsmmentioning

confidence: 99%

The CP-violating 2HDM in light of a strong first order electroweak phase transition and implications for Higgs pair production

Basler

Mühlleitner

Wittbrodt

2018

J. High Energ. Phys.

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We investigate the strength of the electroweak phase transition (EWPT) within the CPviolating 2-Higgs-Doublet Model (C2HDM). The 2HDM is a simple and well-studied model, which can feature CP violation at tree level in its extended scalar sector. This makes it, in contrast to the Standard Model (SM), a promising candidate for explaining the baryon asymmetry of the universe through electroweak baryogenesis. We apply a renormalisation scheme which allows efficient scans of the C2HDM parameter space by using the loop-corrected masses and mixing matrix as input parameters. This procedure enables us to investigate the possibility of a strong first order EWPT required for baryogenesis and study its phenomenological implications for the LHC. Like in the CPconserving (real) 2HDM (R2HDM) we find that a strong EWPT favours mass gaps between the non-SM-like Higgs bosons. These lead to prominent final states comprised of gauge+Higgs bosons or pairs of Higgs bosons. In contrast to the R2HDM, the CP-mixing of the C2HDM also favours approximately mass degenerate spectra with dominant decays into SM particles. The requirement of a strong EWPT further allows us to distinguish the C2HDM from the R2HDM using the signal strengths of the SM-like Higgs boson. We additionally find that a strong EWPT requires an enhancement of the SM-like trilinear Higgs coupling at next-to-leading order (NLO) by up to a factor of 2.4 compared to the NLO SM coupling, establishing another link between cosmology and collider phenomenology. We provide several C2HDM benchmark scenarios compatible with a strong EWPT and all experimental and theoretical constraints. We include the dominant branching ratios of the non-SM-like Higgs bosons as well as the Higgs pair production cross section of the SM-like Higgs boson for every benchmark point. The pair production cross sections can be substantially enhanced compared to the SM and could be observable at the high-luminosity LHC, allowing access to the trilinear Higgs 1 For other recent works on the link between CP violation and electroweak baryogenesis, see [63][64][65]. 2 Recent investigations on the interplay between a strong first order phase transition and the size of the trilinear Higgs self-couplings can also be found in [66][67][68].3 Discussions on the gauge dependence of vc/Tc can be found e.g. in [70,[74][75][76].

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MARC VIII Proceedings: Introduction

Cited by 15 publications

References 0 publications

Probing the symmetric Higgs portal with di-Higgs boson production

Probing the symmetric Higgs portal with di-Higgs boson production

Phenomenology of GUT-inspired gauge-Higgs unification

The CP-violating 2HDM in light of a strong first order electroweak phase transition and implications for Higgs pair production

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