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Decays of the heavy top and new insights on ϵK in a one-VLQ minimal solution to the CKM unitarity problem.
In: European Physical Journal C -- Particles & Fields, Jg. 82 (2022-04-01), Heft 4, S. 1-16
Online
academicJournal
Zugriff:
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 4 × 3 quark mixing matrix which contains the three angles of the 3 × 3 CKM matrix plus three new angles denoted θ 14 , θ 24 , θ 34 . It is assumed that the mixing of T with standard quarks is dominated by θ 14 . Imposing a recently derived, and much more restrictive, upper-bound on the New Physics contributions to ϵ K , we find, in the limit of exact θ 14 dominance where the other extra angles vanish, that ϵ K NP is too large. However, if one relaxes the exact θ 14 dominance limit, there exists a parameter region, where one may obtain ϵ K NP 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 K L → π 0 ν ν ¯ . [ABSTRACT FROM AUTHOR]
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Titel: |
Decays of the heavy top and new insights on ϵK in a one-VLQ minimal solution to the CKM unitarity problem.
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Autor/in / Beteiligte Person: | Botella, Francisco J. ; Branco, G. C. ; Rebelo, M. N. ; Silva-Marcos, J. I. ; Bastos, José Filipe |
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Zeitschrift: | European Physical Journal C -- Particles & Fields, Jg. 82 (2022-04-01), Heft 4, S. 1-16 |
Veröffentlichung: | 2022 |
Medientyp: | academicJournal |
ISSN: | 1434-6044 (print) |
DOI: | 10.1140/epjc/s10052-022-10299-9 |
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