Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness

Aloni, Daniel; Asadi, Pouya; Nakai, Yuichiro; Reece, Matthew; Suzuki, Motoo

doi:10.1007/jhep09(2021)031

Cited by 12 publications

(14 citation statements)

References 93 publications

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“…The constraining power of EDMs has stimulated a lot of different analyses in various UV completions of the SM. There are several studies of the electron and/or neutron EDMs in SUSY models [15][16][17][18], in Composite Higgs models [19][20][21], in Leptoquark models [22][23][24][25], in complex two-Higgs and three-Higgs doublet models [26][27][28][29][30] and in scotogenic models [31]. On the model independent side, [32] provides an analysis of the electron EDM including some contributions that arise at two-loop and at dimension-8 level, while [33] studies the neutron EDM in presence of an effective CP violating Higgs-gluon interaction encoded by a dimension-6 SMEFT operator and [34] analyzes the contribution to the neutron EDM induced by chromo-dipoles of second and third generation quarks.…”

Section: Introductionmentioning

confidence: 99%

Electric dipole moments at one-loop in the dimension-6 SMEFT

Jonathan¹,

Theil²,

Venturini³

et al. 2021

Preprint

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In this paper we present the complete expressions of the lepton and neutron electric dipole moments (EDMs) in the Standard Model Effective Field Theory (SMEFT), up to 1-loop and dimension-6 level and including both RG running contributions and finite corrections. The latter play a fundamental role in the cases of operators that do not renormalize the dipoles, but there are also classes of operators for which they provide an important fraction, 10 − 20%, of the total 1-loop contribution, if the new physics scale is around Λ = 5 TeV. We present the full set of bounds on each individual Wilson coefficient contributing to the EDMs using both the current experimental constraints, as well as those from future experiments, which are expected to improve by at least an order of magnitude.

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Section: Introductionmentioning

confidence: 99%

Electric dipole moments at one-loop in the dimension-6 SMEFT

Jonathan¹,

Theil²,

Venturini³

et al. 2021

Preprint

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show abstract

“…In such models a phenomenon of alignment, in which the quark mass matrices and squark mass-squared matrices are approximately diagonal in the same basis, can suppress flavor-changing neutral currents [117]. It is possible that CP is a fundamental symmetry spontaneously broken only by fields with horizontal charge, which can suppress EDMs [119]; this was recently discussed in the lepton sector in [21,120].…”

Section: A3 Should Gravity Mediation Violate Flavor Maximally?mentioning

confidence: 99%

Complementary Signals of Lepton Flavor Violation at a High-Energy Muon Collider

Homiller,

Lu,

Reece

2022

Preprint

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A muon collider would be a powerful probe of flavor violation in new physics. There is a strong complementary case for collider measurements and precision low-energy probes of lepton flavor violation (as well as CP violation). We illustrate this by studying the collider reach in a supersymmetric scenario with flavor-violating slepton mixing. We find that the collider could discover sleptons and measure the slepton and neutralino masses with high precision, enabling event reconstruction that could cleanly separate flavor-violating new physics signals from Standard Model backgrounds. The discovery reach of a high-energy muon collider would cover a comparably large, and overlapping, range of parameter space to future µ → e conversion and electron EDM experiments, and unlike precision experiments could immediately shed light on the nature of new physics responsible for flavor violation. This complementarity strengthens the case that a muon collider could be an ideal energy-frontier laboratory in the search for physics beyond the Standard Model.

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“…[57]. 2 The idea of spontaneous CP violation has been used in SUSY to suppress contributions to EDMs [68][69][70]. 3 Ref.…”

Section: Introductionmentioning

confidence: 99%

Baryon Asymmetric Universe from Spontaneous CP Violation

Fujikura,

Nakai,

Sato

et al. 2022

Preprint

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Spontaneous CP violation, such as the Nelson-Barr (NB) mechanism, is an attractive scenario for addressing the strong CP problem while realizing the observed phase of the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix. However, not only the CKM phase but also the baryon asymmetric Universe requires sources of CP violation. In this study, we show that a supersymmetric NB mechanism can naturally accommodate the Affleck-Dine (AD) baryogenesis within a CP-invariant Lagrangian. The model provides flat directions associated with new heavy quarks. Focusing on one of the directions, we find that the correct baryon asymmetry is obtained with a sufficiently low reheating temperature which does not cause the gravitino problem. Some parameter space is consistent with the gravitino dark matter. We assess radiative corrections to the strong CP phase induced by gaugemediated supersymmetry breaking and CP-violating heavy fields and show that the strong CP problem is solved in a viable parameter space where the visible sector supersymmetric particles must be lighter than O(100) TeV. Even in the case that they are heavier than the TeV scale, our model predicts the neutron electric dipole moment within the reach of the near future experiments. Our model addresses the electroweak naturalness problem, strong CP problem, baryon asymmetric Universe, and dark matter. Then, the model may give a new compelling paradigm of physics beyond the Standard Model.

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Spontaneous CP violation and horizontal symmetry in the MSSM: toward lepton flavor naturalness

Cited by 12 publications

References 93 publications

Electric dipole moments at one-loop in the dimension-6 SMEFT

Electric dipole moments at one-loop in the dimension-6 SMEFT

Complementary Signals of Lepton Flavor Violation at a High-Energy Muon Collider

Baryon Asymmetric Universe from Spontaneous CP Violation

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