Dilaton at the LHC: Complementary Probe of Composite Higgs

Autor: Bruggisser, Sebastian, von Harling, Benedict, Matsedonskyi, Oleksii, Servant, Geraldine
Přispěvatelé: Apollo - University of Cambridge Repository
Rok vydání: 2022
Předmět:
invariance: conformal
Nuclear and High Energy Physics
interpretation of experiments: CERN LHC Coll
FOS: Physical sciences
Higgs particle
symmetry breaking
High Energy Physics - Experiment
Subatomär fysik
dilaton: mass
Higgs model
composite
High Energy Physics - Experiment (hep-ex)
High Energy Physics - Phenomenology (hep-ph)
dilaton: coupling
Subatomic Physics
TeV
ddc:530
potential
Higgs
conformal [invariance]
dilaton
coupling
Higgs model: composite
Compositeness
composite [Higgs model]
New Light Particles
electroweak interaction
new physics
coupling
Higgs
spontaneous symmetry breaking
sensitivity
Goldstone particle
dilaton
mass
coupling: Higgs
High Energy Physics - Phenomenology
CERN LHC Coll
mass [dilaton]
invariance
conformal
CERN LHC Coll [interpretation of experiments]
potential: Higgs
Higgs [potential]
Higgs [coupling]
coupling [dilaton]
signature
Zdroj: Journal of high energy physics 05, 080 (2023). doi:10.1007/JHEP05(2023)080
Journal of High Energy Physics
DOI: 10.48550/arxiv.2212.00056
Popis: Journal of high energy physics 05, 080 (2023). doi:10.1007/JHEP05(2023)080
The dilaton is predicted in various extensions of the standard model containing sectors with an approximate spontaneously-broken conformal invariance. As a Goldstone boson of a spontaneously broken symmetry, the dilaton can naturally be one of the lightest new physics particles, and therefore may be the first new physics imprint observed in collider experiments. In particular, it can arise in composite Higgs models which are often assumed to have approximate conformal invariance in the UV. The dilaton is then a composite state, generated by the same sector that produces the Higgs. We continue the exploration of composite dilaton signatures at the LHC, using the latest experimental data and analysing the future detection prospects. We elaborate on the connection of the dilaton properties with the properties of the Higgs potential, clarifying in particular the relation between the scale relevant for electroweak fine tuning and the scale controlling the dilaton couplings. This relation is then used to derive the experimental sensitivity to the dilaton in natural composite Higgs scenarios, which reaches ~ 3 TeV in dilaton mass for generic parameter choices. At the same time, we show that dilaton searches are a complementary direction to probe Higgs boson compositeness, with the sensitivity comparable or exceeding that of Higgs coupling measurements.
Published by SISSA, [Trieste]
Databáze: OpenAIRE
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