Spontaneous 
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 violation and the strong 
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 problem in left-right symmetric theories

Ohmer, Sebastian

doi:10.1103/physrevd.99.115031

“…Here we will investigate in detail the predictions of the few scenarios that can structurally ensure (4), which we call models of d−mediation and u−mediation. Other recent work on scenarios of spontaneous CP breaking include [16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The CKM Phase and $\barθ$ in Nelson-Barr Models

Valenti,

Vecchi

2021

Preprint

2

10

0

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We analyze the Nelson-Barr approach to the Strong CP Problem. We derive the necessary conditions in order to simultaneously reproduce the CKM phase and the quark masses. Then we quantify the irreducible contributions to the QCD topological angle, namely the corrections arising from loops of the colored fermion mediators that characterize these models. Corrections analytic in the couplings first arise at 3-loop order and are safely below current bounds; non-analytic effects are 2-loop order and decouple as the mediators exceed a few TeV. We discuss collider, electroweak, and flavor bounds and argue that most of the parameter space above the TeV scale is still allowed in models with down-type mediators, whereas other scenarios are more severely constrained. With two or more families of mediators the dominant experimental bound is due to the neutron electric dipole moment.

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“…Here we will investigate in detail the predictions of the few scenarios that can structurally ensure (1.4), which we call models of d-mediation and u-mediation. Other recent work on scenarios of spontaneous CP breaking include [16][17][18][19][20][21][22][23][24][25].…”

Section: Jhep07(2021)203mentioning

confidence: 99%

The CKM phase and $$ \overline{\theta} $$ in Nelson-Barr models

Valenti

¹

,

Vecchi

²

2021

J. High Energ. Phys.

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We analyze the Nelson-Barr approach to the Strong CP Problem. We derive the necessary conditions in order to simultaneously reproduce the CKM phase and the quark masses. Then we quantify the irreducible contributions to the QCD topological angle, namely the corrections arising from loops of the colored fermion mediators that characterize these models. Corrections analytic in the couplings first arise at 3-loop order and are safely below current bounds; non-analytic effects are 2-loop order and decouple as the mediators exceed a few TeV. We discuss collider, electroweak, and flavor bounds and argue that most of the parameter space above the TeV scale is still allowed in models with down-type mediators, whereas other scenarios are more severely constrained. With two or more families of mediators the dominant experimental bound is due to the neutron electric dipole moment.

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Flipped Quartification: Product Group Unification with Leptoquarks

Dent,

Kephart,

Päs

et al. 2024

Entropy

0

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The quartification model is an SU(3)4 extension with a bi-fundamental fermion sector of the well-known SU(3)3 bi-fundamentalfication model. An alternative “flipped” version of the quartification model is obtained by rearrangement of the particle assignments. The flipped model has two standard (bi-fundamentalfication) families and one flipped quartification family. In contrast to traditional product group unification models, flipped quartification stands out by featuring leptoquarks and thus allows for new mechanisms to explain the generation of neutrino masses and possible hints of lepton-flavor non-universality.

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Spontaneous CP violation and the strong CP problem in left-right symmetric theories

Cited by 3 publications

References 89 publications

The CKM Phase and $\barθ$ in Nelson-Barr Models

The CKM Phase and $\barθ$ in Nelson-Barr Models

The CKM phase and $$ \overline{\theta} $$ in Nelson-Barr models

Flipped Quartification: Product Group Unification with Leptoquarks

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