Preprint

PUBDB-2022-07130

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dilaton at the LHC: Complementary Probe of Composite Higgs

Bruggisser, S.Extern* ; von Harling, B. (Corresponding author) ; Matsedonskyi, O.Extern* ; Servant, G.DESY*

2022

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-07130

Report No.: DESY-22-190; arXiv:2212.00056

Abstract: 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.

Keyword(s): invariance, conformal ; dilaton, mass ; Higgs model, composite ; potential, Higgs ; coupling, Higgs ; dilaton, coupling ; new physics ; sensitivity ; spontaneous symmetry breaking ; CERN LHC Coll ; Goldstone particle ; electroweak interaction ; signature ; symmetry breaking ; Higgs particle ; TeV

Note: 25 pages, 16 figures

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2022

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Database coverage:
; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Bruggisser, S.Extern* ; Harling, B. v. (Corresponding author) ; Matsedonskyi, O.Extern* ; Servant, G.DESY*
Dilaton at the LHC: complementary probe of composite Higgs
Journal of high energy physics 05, 080 (2023) [10.1007/JHEP05(2023)080]2023     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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