Fermion EDMs with minimal flavor violation

He, Xiao‐Gang; Lee, Chao-Jung; Li, Siao-Fong; Tandean, Jusak

doi:10.1007/jhep08(2014)019

Cited by 19 publications

(15 citation statements)

References 89 publications

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“…(2.9) complex due to imaginary parts among the traces of the matrix products A i B j A k · · · . Such imaginary contributions turn out to be small [29][30][31][32], and so hereafter we ignore Im ξ r .…”

Section: Jhep04(2015)174mentioning

confidence: 99%

“…(2.8), and so A can have much greater elements if the right-handed neutrinos' mass M in M ν is sufficiently large. Since as an infinite series ∆ has to converge, M cannot be arbitrarily large [29][30][31][32]. Accordingly, we require the largest eigenvalue of A to be unity, which implies that the elements of B = Y e Y † e are small compared to those of A and that, consequently, we can drop most of the terms in eq.…”

Section: Jhep04(2015)174mentioning

confidence: 99%

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Lepton-flavored scalar dark matter with minimal flavor violation

Lee

Tandean

2015

J. High Energ. Phys.

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We explore scalar dark matter that is part of a lepton flavor triplet satisfying symmetry requirements under the hypothesis of minimal flavor violation. Beyond the standard model, the theory contains in addition three right-handed neutrinos that participate in the seesaw mechanism for light neutrino mass generation. The dark-matter candidate couples to standard-model particles via Higgs-portal renormalizable interactions as well as to leptons through dimension-six operators, all of which have minimal flavor violation built-in. We consider restrictions on the new scalars from the Higgs boson measurements, observed relic density, dark-matter direct detection experiments, LEP II measurements on e + e − scattering into a photon plus missing energy, and searches for flavor-violating lepton decays. The viable parameter space can be tested further with future data. Also, we investigate the possibility of the new scalars' couplings accounting for the tentative hint of Higgs flavor-violating decay h → µτ recently detected in the CMS experiment. They are allowed by constraints from other Higgs data to produce a rate of this decay roughly compatible with the CMS finding.

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Section: Jhep04(2015)174mentioning

confidence: 99%

Section: Jhep04(2015)174mentioning

confidence: 99%

Lepton-flavored scalar dark matter with minimal flavor violation

Lee

Tandean

2015

J. High Energ. Phys.

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“…To maximize the new-physics effects, we assume that the righthanded neutrinos' mass M is large enough to render the biggest eigenvalue of A equal to unity, which conforms to the perturbativity requirement [59,60,74,75]. Given that the eigenvalues of B are at most y 2 τ ∼ 1 × 10 −4 , we may consequently drop from ∆ all the terms with B, which would otherwise be needed in a study concerning CP violation [59][60][61]. Accordingly, the relevant building block is [61] …”

Section: Jhep09(2015)093mentioning

confidence: 99%

“…As Imξ 1,2,4 are tiny [59,60,74,75], we can further approximate ∆ † = ∆. One could then construct the desired G ℓ -invariant effective Lagrangians that are SM gauge singlet.…”

Section: Jhep09(2015)093mentioning

confidence: 99%

Higgs decay h → μτ with minimal flavor violation

Tandean

Zheng

2015

J. High Energ. Phys.

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Abstract:We consider the tentative indication of flavor-violating Higgs boson decay h → µτ recently reported in the CMS experiment within the framework of minimal flavor violation. Specifically, we adopt the standard model extended with the seesaw mechanism involving right-handed neutrinos plus effective dimension-six operators satisfying the minimal flavor violation principle in the lepton sector. We find that it is possible to accommodate the CMS h → µτ signal interpretation provided that the right-handed neutrinos couple to the Higgs boson in some nontrivial way. We take into account empirical constraints from other lepton-flavor-violating processes and discuss how future searches for the µ → eγ decay and µ → e conversion in nuclei may further probe the lepton-flavor-violating Higgs couplings.

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“…It should also be noted that several authors have recently considered the NEDM within frameworks beyond the SM;-see for instance refs. [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Colored scalars and the neutron electric dipole moment

Fajfer¹,

Eeg²

2014

Phys. Rev. D

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We investigate new contributions to the neutron electric dipole moment induced by colored scalars. As an example, we evaluate contributions coming from the color octet, weak doublet scalar, accommodated within a modified Minimal Flavor Violating framework. These flavor non-diagonal couplings of the color octet scalar might account for the measured assymmetrytree level. The same couplings constrained by this assymmetry also induce two-loop contributions to the neutron electric dipole moment. We find that the direct CP violating asymmetry in neutral D-meson decays is more constraining on the allowed parameter space than the current experimental bound on neutron electric dipole moment. We comment also on contributions of higher dimensional operators to the neutron electric dipole moment within this framework.

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Fermion EDMs with minimal flavor violation

Cited by 19 publications

References 89 publications

Lepton-flavored scalar dark matter with minimal flavor violation

Lepton-flavored scalar dark matter with minimal flavor violation

Higgs decay h → μτ with minimal flavor violation

Colored scalars and the neutron electric dipole moment

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