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Origin of Yukawa couplings for Higgs bosons and leptoquarks

Origin of Yukawa couplings for Higgs bosons and leptoquarks
Origin of Yukawa couplings for Higgs bosons and leptoquarks

We propose a model in which the Yukawa couplings of Higgs doublets are related to the couplings of the chiral fermions to a scalar leptoquark triplet. This is due to their common origin via mixing with a vectorlike family distinguished by a discrete Z5 symmetry, under which only the three chiral families are neutral. The model predicts lepton nonuniversality in B to K decays, depending on the leptoquark mass, Vts and mμ/mτ. The model can only consistently explain the anomalies in RK(∗) for a leptoquark mass close to the collider lower bound of about 1 TeV. Constraints from Bs-Bs mixing and eventually τ→μγ become relevant for low leptoquark masses and large couplings, while μ→eγ remains automatically under control due to the absence of leptoquark couplings to the electron in this model.

2470-0010
1-11
De Medeiros Varzielas, Ivo
9e2b1443-1449-4687-8d03-2f67275730c0
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
De Medeiros Varzielas, Ivo
9e2b1443-1449-4687-8d03-2f67275730c0
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538

De Medeiros Varzielas, Ivo and King, Stephen F. (2019) Origin of Yukawa couplings for Higgs bosons and leptoquarks. Physical Review D, 99 (9), 1-11, [095029]. (doi:10.1103/PhysRevD.99.095029).

Record type: Article

Abstract

We propose a model in which the Yukawa couplings of Higgs doublets are related to the couplings of the chiral fermions to a scalar leptoquark triplet. This is due to their common origin via mixing with a vectorlike family distinguished by a discrete Z5 symmetry, under which only the three chiral families are neutral. The model predicts lepton nonuniversality in B to K decays, depending on the leptoquark mass, Vts and mμ/mτ. The model can only consistently explain the anomalies in RK(∗) for a leptoquark mass close to the collider lower bound of about 1 TeV. Constraints from Bs-Bs mixing and eventually τ→μγ become relevant for low leptoquark masses and large couplings, while μ→eγ remains automatically under control due to the absence of leptoquark couplings to the electron in this model.

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Published date: 23 May 2019

Identifiers

Local EPrints ID: 432320
URI: http://eprints.soton.ac.uk/id/eprint/432320
ISSN: 2470-0010
PURE UUID: 2cbdfe08-006b-4e76-aed4-39462e34e3ff

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Date deposited: 10 Jul 2019 16:30
Last modified: 14 Sep 2021 19:21

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