Flavor constraints for a vector-like quark of Nelson-Barr type

Abstract The Nelson-Barr (NB) mechanism to solve the strong CP problem assumes CP conservation, arranges vanishing θ ¯ $$ \overline{\theta} $$ at tree-level and requires vector-like quarks (VLQs) to transmit the CP breaking to the SM. We analyze the flavor constraints coming from the presence of one...

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Main Authors:	A. L. Cherchiglia, G. De Conto, C. C. Nishi
Format:	article
Language:	EN
Published:	SpringerOpen 2021
Subjects:	Beyond Standard Model CP violation Quark Masses and SM Parameters Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Online Access:	https://doaj.org/article/4c80a0cc61b44dfaac6ce635b2e17b51
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spelling	oai:doaj.org-article:4c80a0cc61b44dfaac6ce635b2e17b512021-11-21T12:41:02ZFlavor constraints for a vector-like quark of Nelson-Barr type10.1007/JHEP11(2021)0931029-8479https://doaj.org/article/4c80a0cc61b44dfaac6ce635b2e17b512021-11-01T00:00:00Zhttps://doi.org/10.1007/JHEP11(2021)093https://doaj.org/toc/1029-8479Abstract The Nelson-Barr (NB) mechanism to solve the strong CP problem assumes CP conservation, arranges vanishing θ ¯ $$ \overline{\theta} $$ at tree-level and requires vector-like quarks (VLQs) to transmit the CP breaking to the SM. We analyze the flavor constraints coming from the presence of one such down type VLQ of NB type by performing a global fit on the relevant flavor observables. A comparison is made to the case of one generic VLQ. We find that the allowed parameter space for the VLQ Yukawa couplings and the mixing to the SM are confined to a region much smaller than in the generic case, making the NB case falsifiable in principle.A. L. CherchigliaG. De ContoC. C. NishiSpringerOpenarticleBeyond Standard ModelCP violationQuark Masses and SM ParametersNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENJournal of High Energy Physics, Vol 2021, Iss 11, Pp 1-29 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Beyond Standard Model CP violation Quark Masses and SM Parameters Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Beyond Standard Model CP violation Quark Masses and SM Parameters Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 A. L. Cherchiglia G. De Conto C. C. Nishi Flavor constraints for a vector-like quark of Nelson-Barr type
description	Abstract The Nelson-Barr (NB) mechanism to solve the strong CP problem assumes CP conservation, arranges vanishing θ ¯ $$ \overline{\theta} $$ at tree-level and requires vector-like quarks (VLQs) to transmit the CP breaking to the SM. We analyze the flavor constraints coming from the presence of one such down type VLQ of NB type by performing a global fit on the relevant flavor observables. A comparison is made to the case of one generic VLQ. We find that the allowed parameter space for the VLQ Yukawa couplings and the mixing to the SM are confined to a region much smaller than in the generic case, making the NB case falsifiable in principle.
format	article
author	A. L. Cherchiglia G. De Conto C. C. Nishi
author_facet	A. L. Cherchiglia G. De Conto C. C. Nishi
author_sort	A. L. Cherchiglia
title	Flavor constraints for a vector-like quark of Nelson-Barr type
title_short	Flavor constraints for a vector-like quark of Nelson-Barr type
title_full	Flavor constraints for a vector-like quark of Nelson-Barr type
title_fullStr	Flavor constraints for a vector-like quark of Nelson-Barr type
title_full_unstemmed	Flavor constraints for a vector-like quark of Nelson-Barr type
title_sort	flavor constraints for a vector-like quark of nelson-barr type
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/4c80a0cc61b44dfaac6ce635b2e17b51
work_keys_str_mv	AT alcherchiglia flavorconstraintsforavectorlikequarkofnelsonbarrtype AT gdeconto flavorconstraintsforavectorlikequarkofnelsonbarrtype AT ccnishi flavorconstraintsforavectorlikequarkofnelsonbarrtype
_version_	1718418880541491200

Flavor constraints for a vector-like quark of Nelson-Barr type

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