Higgs low-energy theorem (and its corrections) in composite models
By Marc Gillioz, R. Grober, Christophe Grojean, M. Muhlleitner, E. Salvioni. 2012
138 citations recorded by the source corpus.
A bstractThe Higgs low-energy theorem gives a simple and elegant way to estimate the couplings of the Higgs boson to massless gluons and photons induced by loops of heavy particles. We extend this theorem to take into account possible nonlinear Higgs interactions as well as new states resulting from a strong dynamics at the origin of the breaking of the electroweak symmetry. We show that, while it approximates with an accuracy of order a few percents single Higgs production, it receives corrections of order 50% for double Higgs production. A full one-loop computation of the gg → hh cross section is explicitly performed in MCHM5, the minimal composite Higgs model based on the SO(5)/SO(4) coset with the Standard Model fermions embedded into the fundamental representation of SO(5). In particular we take into account the contributions of all fermionic resonances, which give sizeable (negative) corrections to the result obtained considering only the Higgs nonlinearities. Constraints from electroweak precision and flavor data on the top partners are analyzed in detail, as well as direct searches at the LHC for these new fermions called to play a crucial role in the electroweak symmetry breaking dynamics.
Subfields: Artificial Intelligence, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/1ad0544d4df7f25522b80c217dc1e85309ddcb6a
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In Artificial Intelligence
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In Nuclear and High Energy Physics
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- Gudrun Heinrich
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Citations in the corpus
- The measurement of the Higgs self-coupling at the LHC: theoretical status (2012, background): “[78, 79]).”
- Effective Lagrangian for a light Higgs-like scalar (2013, background): “In fact, in the case of minimal models with linear couplings, like for example the MCHM4 and MCHM5, the low energy theorem [57–59] implies that the leading contribution to the γγ and gg decay rates from the virtual exchange of heavy fermions is additionally suppressed [60–63] due to a cancellation b”
- Top-quark mass effects in double and triple Higgs production in gluon-gluon fusion at NLO (2014, background): “These possibilities range from explicit models featuring new particles, such as the 2HDM [12–15], SUSY [6, 16–18], extended colored sectors [19–21], Little Higgs Models [22, 23], Higgs portal [24, 25], flavor symmetry models [26] and Composite Higgs models [27, 28] to model independent higher-dimens”
- Higgs boson self-coupling measurements using ratios of cross sections (2013, background): “We note that the above structure, and hence the different contributions to the cross section, can of course be modified if new physics that allows new resonances to run in the triangle and box loops (or adds new couplings, like an ffHH interaction) is present [48–53].”
- Lifting degeneracies in Higgs couplings using single top production in association with a Higgs boson (2012, unknown): “[33–35].”
- Higgs Physics at the HL-LHC and HE-LHC (2019, background): “The general decomposition of Higgs couplings then becomes [697] (see also [698, 699, 700])”