Constraining four-fermion operators using rare top decays

Chala, Mikael; Santiago, Jose; Spannowsky, Michael

doi:10.1007/jhep04(2019)014

Constraining four-fermion operators using rare top decays

Chala, Mikael; Santiago, Jose; Spannowsky, Michael

Authors

Mikael Chala

Jose Santiago

Professor Michael Spannowsky michael.spannowsky@durham.ac.uk
Director

Abstract

New physics can manifest itself by an appreciable increase of the decay rate of top quarks in rare flavour-changing final states. Exploiting the large top quark production rate at the LHC, we bound four-fermion operators contributing to non-resonant t → ℓ+ℓ−j using different signal regions of the latest LHC searches for t → Zj. We also provide prospects for the high-luminosity LHC to test these as well as four-fermion operators contributing to t→bb¯¯j , based on improved analysis strategies of existing searches. We single out all weakly-coupled ultraviolet completions inducing such contact interactions at tree level and translate the previous bounds to the parameter space of specific complete models. Being above the TeV, LHC bounds from rare top decays improve over those from flavour physics, electroweak precision data and other LHC searches in several cases.

Citation

Chala, M., Santiago, J., & Spannowsky, M. (2019). Constraining four-fermion operators using rare top decays. Journal of High Energy Physics, 2019(4), Article 14. https://doi.org/10.1007/jhep04%282019%29014

Journal Article Type	Article
Acceptance Date	Mar 24, 2019
Online Publication Date	Apr 2, 2019
Publication Date	Apr 30, 2019
Deposit Date	Apr 12, 2019
Publicly Available Date	Apr 12, 2019
Journal	Journal of High Energy Physics
Print ISSN	1126-6708
Publisher	Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed	Peer Reviewed
Volume	2019
Issue	4
Article Number	14
DOI	https://doi.org/10.1007/jhep04%282019%29014

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