Electroweak top couplings, partial compositeness, and top partner

Brown, S., Englert, C. , Galler, P. and Stylianou, P. (2020) Electroweak top couplings, partial compositeness, and top partner. Physical Review D, 102(7), 075021. (doi: 10.1103/PhysRevD.102.075021)

Abstract

Partial top quark compositeness is a crucial aspect of theories with strong electroweak symmetry breaking. Together with the heavy top partners that lift the top quark mass to its observed value, these theories predict correlated modifications of the top quark’s electroweak couplings. Associated measurements therefore provide direct constraints on the ultraviolet structure of the underlying hypercolour dynamics. In this paper we employ a minimal version of top compositeness to discuss how measurements related to the top’s electroweak gauge interactions can inform the potential composite nature of the TeV scale. In doing so, we identify the dominant factors that limit the BSM sensitivity. Extrapolating to a future 100 TeV hadron collider, we demonstrate that top quark measurements performed at highest precision can provide additional information to resonance search by performing a representative resonant top partner search that specifically targets the correlated resonant electroweak top partner signatures.

• Item Type: Articles
• Additional Information: Funded by SCOAP3.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Galler, Dr Peter Gerard and Brown, Stephen and Stylianou, Mr Panagiotis and Englert, Professor Christoph
• Authors: Brown, S., Englert, C., Galler, P., and Stylianou, P.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review D
• Publisher: American Physical Society
• ISSN: 2470-0010
• ISSN (Online): 2470-0029
• Copyright Holders: Copyright © 2020 American Physical Society
• First Published: First published in Physical Review D 102:075021
• Publisher Policy: Reproduced under a Creative Commons Licence

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Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
173809		Phenomenology from Lattice QCD and Collider Physics	Christine Davies	Science and Technology Facilities Council (STFC)	ST/P000746/1	P&S - Physics & Astronomy
308821		STFC Glasgow 2019 DTP	Martin Hendry	Science and Technology Facilities Council (STFC)	ST/T506102/1	P&S - Physics & Astronomy