Journal Article

PUBDB-2023-03389

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dilaton at the LHC: complementary probe of composite Higgs

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

2023
SISSA [Trieste]

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Please use a persistent id in citations: doi:10.1007/JHEP05(2023)080  doi:10.3204/PUBDB-2023-03389

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 ; interpretation of experiments: CERN LHC Coll ; Goldstone particle ; electroweak interaction ; signature ; symmetry breaking ; Higgs particle ; TeV ; Compositeness ; New Light Particles

Note: 26 pages, 18 figures; v2: two plots, comments and references added, JHEP version

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project 390833306 - EXC 2121: Quantum Universe (390833306) (390833306)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2023

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Database coverage:
; ; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; National-Konsortium ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Bruggisser, S.Extern* ; von Harling, B. (Corresponding author) ; Matsedonskyi, O.Extern* ; Servant, G.DESY*
Dilaton at the LHC: Complementary Probe of Composite Higgs
[10.3204/PUBDB-2022-07130]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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