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In order for the deviations from unitarity to be of the required size while keeping the theory perturbative, the new top quark should have a mass<jats:italic>m<\/jats:italic><jats:sub><jats:italic>T<\/jats:italic><\/jats:sub>\u2272 7 TeV which could be probed in upcoming experiments at the energy frontier.<\/jats:p>","DOI":"10.1007\/jhep07(2021)099","type":"journal-article","created":{"date-parts":[[2021,7,19]],"date-time":"2021-07-19T03:13:32Z","timestamp":1626664412000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Addressing the CKM unitarity problem with a vector-like up quark"],"prefix":"10.1007","volume":"2021","author":[{"given":"G. C.","family":"Branco","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8438-3341","authenticated-orcid":false,"given":"J. T.","family":"Penedo","sequence":"additional","affiliation":[]},{"given":"Pedro M. 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