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Behavior of composite resonances breaking lepton flavor universality

Chala, Mikael; Spannowsky, Michael

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Authors

Mikael Chala



Abstract

Within the context of composite Higgs models, recent hints on lepton flavor nonuniversality in B decays can be explained by a vector resonance V with sizeable couplings to the Standard Model leptons ( ℓ ). We argue that, in such a case, spin- 1 / 2 leptonic resonances ( L ) are most probably light enough to open the decay mode V → L ℓ . This implies, in combination with the fact that couplings between composite resonances are much larger than those between composite and elementary fields, that this new decay can be important. In this paper, we explore under which conditions it dominates over other decay modes. Its discovery, however, requires a dedicated search strategy. Employing jet substructure techniques, we analyze the final state with largest branching ratio, namely μ + μ − Z / h , Z / h → jets. We show that (i) parameter space regions that were believed excluded by dimuon searches are still allowed, (ii) these regions can already be tested with the dedicated search we propose and (iii) V masses as large as ∼ 3.5     TeV can be probed at the LHC during the high-luminosity phase.

Citation

Chala, M., & Spannowsky, M. (2018). Behavior of composite resonances breaking lepton flavor universality. Physical Review D, 98(3), Article 035010. https://doi.org/10.1103/physrevd.98.035010

Journal Article Type Article
Acceptance Date Mar 18, 2018
Online Publication Date Aug 7, 2018
Publication Date Aug 7, 2018
Deposit Date Aug 8, 2018
Publicly Available Date Mar 29, 2024
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 98
Issue 3
Article Number 035010
DOI https://doi.org/10.1103/physrevd.98.035010

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.





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