scholarly journals Electric dipole moments in the extended scotogenic models

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Motoko Fujiwara ◽  
Junji Hisano ◽  
Chihiro Kanai ◽  
Takashi Toma
Keyword(s):  
Parameter Space ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Mass Hierarchy ◽  
Neutrino Mass Hierarchy ◽  
Electric Dipole Moments ◽  
Yukawa Couplings ◽  
Unitarity Bound ◽  
Charged Leptons ◽  
Electron Edm

Abstract Electric dipole moments (EDMs) of charged leptons arise from a new source of CP violation in the lepton sector. In this paper, we calculate the EDMs of the charged leptons in the minimal scotogenic model with two singlet fermions, and the models extended with one or two triplet fermions instead of the singlet fermions, taking into account the constraints of the neutrino oscillation data, the charged lepton flavor violation and perturbative unitarity bound for the Yukawa couplings. We show that the hybrid model with one singlet and one triplet fermions predicts an electron EDM larger than the other models in both normal and inverted neutrino mass hierarchy. We find some parameter space has already been ruled out by the current upper bound of the electron EDM and further parameter space can be explored by future experiments.

scholarly journals ν electroweak baryogenesis

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
E. Fernández-Martínez ◽  
J. López-Pavón ◽  
T. Ota ◽  
S. Rosauro-Alcaraz
Keyword(s):  
Cp Violation ◽  
Parameter Space ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Baryon Asymmetry ◽  
Neutrino Masses ◽  
Electric Dipole Moments ◽  
Yukawa Couplings ◽  
Future Collider ◽  
The Universe

Abstract We investigate if the CP violation necessary for successful electroweak baryo- genesis may be sourced by the neutrino Yukawa couplings. In particular, we consider an electroweak scale Seesaw realization with sizable Yukawas where the new neutrino singlets form (pseudo)-Dirac pairs, as in the linear or inverse Seesaw variants. We find that the baryon asymmetry obtained strongly depends on how the neutrino masses vary within the bubble walls. Moreover, we also find that flavour effects critically impact the final asymmetry obtained and that, taking them into account, the observed value may be obtained in some regions of the parameter space. This source of CP violation naturally avoids the strong constraints from electric dipole moments and links the origin of the baryon asymmetry of the Universe with the mechanism underlying neutrino masses. Interestingly, the mixing of the active and heavy neutrinos needs to be sizable and could be probed at the LHC or future collider experiments.

scholarly journals Electric dipole moment constraints on CP-violating heavy-quark Yukawas at next-to-leading order

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Joachim Brod ◽  
Emmanuel Stamou
Keyword(s):  
Electric Dipole ◽  
Anomalous Dimension ◽  
Phenomenological Study ◽  
Dipole Moments ◽  
Charm Quark ◽  
Leading Order ◽  
Logarithmic Order ◽  
Electric Dipole Moments ◽  
Yukawa Couplings ◽  
Experimental Bound

Abstract Electric dipole moments are sensitive probes of new phases in the Higgs Yukawa couplings. We calculate the complete two-loop QCD anomalous dimension matrix for the mixing of CP-odd scalar and tensor operators and apply our results for a phenomenological study of CP violation in the bottom and charm Yukawa couplings. We find large shifts of the induced Wilson coefficients at next-to-leading-logarithmic order. Using the experimental bound on the electric dipole moments of the neutron and mercury, we update the constraints on CP-violating phases in the bottom and charm quark Yukawas.

scholarly journals PARITY VIOLATION AND ELECTRIC DIPOLE MOMENTS IN ATOMS AND MOLECULES

2012 ◽  
Vol 21 (11) ◽  
pp. 1230010 ◽  
Author(s):  
V. A. DZUBA ◽  
V. V. FLAMBAUM
Keyword(s):  
Parity Violation ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Current Status ◽  
Electric Dipole Moments ◽  
Atoms And Molecules ◽  
Invariance Violation ◽  
Time Invariance ◽  
Electron Edm ◽  
A Chain

We review the current status of the study of parity and time invariance violation in atoms, nuclei and molecules. We focus on parity nonconservation (PNC) in cesium (CS) and three of the most promising areas of research: (i) PNC in a chain of isotopes, (ii) search for nuclear anapole moments, and (iii) search for permanent electric dipole moments (EDMs) of atoms and molecules, which in turn are caused by either an electron EDM or nuclear T, P-odd moments such as a nuclear EDM or nuclear Schiff moment.

scholarly journals Search for electric dipole moments

2020 ◽  
Vol 234 ◽  
pp. 01007
Author(s):  
Klaus Kirch ◽  
Philipp Schmidt-Wellenburg
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
International Community ◽  
Current Status ◽  
Electric Dipole Moments ◽  
Fundamental Particles ◽  
Charged Leptons

Searches for permanent electric dipole moments of fundamental particles and systems with spin are the experiments most sensitive to new CP violating physics and a top priority of a growing international community. We briefly review the current status of the field emphasizing on the charged leptons and lightest baryons.

scholarly journals Supersymmetric alignment models for (g − 2)μ

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Yuichiro Nakai ◽  
Matthew Reece ◽  
Motoo Suzuki
Keyword(s):  
Cp Violation ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Mass Scale ◽  
Electric Dipole Moments ◽  
Viable Solution ◽  
Supersymmetric Models ◽  
Standard Models ◽  
Supersymmetric Particles ◽  
Electron Edm

Abstract Hierarchical masses of quarks and leptons are addressed by imposing horizontal symmetries. In supersymmetric Standard Models, the same symmetries play a role in suppressing flavor violating processes induced by supersymmetric particles. Combining the idea of spontaneous CP violation to control contributions to electric dipole moments (EDMs), the mass scale of supersymmetric particles can be lowered. We present supersymmetric models with U(1) horizontal symmetries and discuss CP and flavor constraints. Models with two U(1) symmetries are found to give a viable solution to the muon g − 2 anomaly. Interestingly, the parameter space to explain the anomaly will be probed by future electron EDM experiments.

scholarly journals Electric dipole moments of charged leptons at one loop in the presence of massive neutrinos

2017 ◽  
Vol 95 (5) ◽  
Author(s):  
H. Novales-Sánchez ◽  
M. Salinas ◽  
J. J. Toscano ◽  
O. Vázquez-Hernández
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
Electric Dipole Moments ◽  
Massive Neutrinos ◽  
Charged Leptons
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