https://doi.org/10.1140/epjc/s10052-022-10299-9
Regular Article - Theoretical Physics
Decays of the heavy top and new insights on 
in a one-VLQ minimal solution to the CKM unitarity problem
1
Departament de Física Teòrica and IFIC, Universitat de València-CSIC, 46100, Burjassot, Spain
2
Centro de Física Teórica de Partículas, CFTP, Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais nr. 1, 1049-001, Lisboa, Portugal
e
jose.bastos@tecnico.ulisboa.pt
Received:
29
December
2021
Accepted:
6
April
2022
Published online:
25
April
2022
We propose a minimal extension of the Standard Model where an up-type vector-like quark, denoted T, is introduced and provides a simple solution to the CKM unitarity problem. We adopt the Botella-Chau parametrization in order to extract the 
quark mixing matrix which contains the three angles of the 
CKM matrix plus three new angles denoted 
, 
, 
. It is assumed that the mixing of T with standard quarks is dominated by . Imposing a recently derived, and much more restrictive, upper-bound on the New Physics contributions to 
, we find, in the limit of exact dominance where the other extra angles vanish, that 
is too large. However, if one relaxes the exact dominance limit, there exists a parameter region, where one may obtain in agreement with experiment while maintaining the novel pattern of T decays with the heavy quark decaying predominantly to the light quarks d and u. We also find a reduction in the decay rate of 
.
The original online version of this article was revised: The Acknowledgements section was missing from this article.
An erratum to this article is available online at https://doi.org/10.1140/epjc/s10052-022-10398-7.
Copyright comment corrected publication 2022
© The Author(s) 2022. corrected publication 2022
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