Top down electroweak dipole operators

Fuyuto, Kaori; Ramsey-Musolf, Michael

doi:10.1016/j.physletb.2018.04.022

Title: Top down electroweak dipole operators

Abstract

We derive present constraints on, and prospective sensitivity to, the electric dipole moment (EDM) of the top quark (d_t) implied by searches for the EDMs of the electron and nucleons. Above the electroweak scale v, the d_t arises from two gauge invariant operators generated at a scale Λ >> that also mix with the light fermion EDMs under renormalization group evolution at two-loop order. Bounds on the EDMs of first generation fermion systems thus imply bounds on |d_t| . Working in the leading log-squared approximation, we find that the present upper bound on |d_t| is 10¹⁹ cm for TeV, except in regions of finely tuned cancellations that allow for to be up to fifty times larger. Future d_e and d_n probes may yield an order of magnitude increase in d_t sensitivity, while inclusion of a prospective proton EDM search may lead to an additional increase in reach.

Authors:: Fuyuto, Kaori; Ramsey-Musolf, Michael

Publication Date:: 2018-06-01

Research Org.:: Univ. of Massachusetts, Amherst, MA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1437867

Alternate Identifier(s):: OSTI ID: 1499287

Grant/Contract Number:: SC0011095

Resource Type:: Published Article

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Name: Physics Letters B Journal Volume: 781 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Fuyuto, Kaori, and Ramsey-Musolf, Michael. Top down electroweak dipole operators.  Netherlands: N. p., 2018. 
Web.  doi:10.1016/j.physletb.2018.04.022.

Copy to clipboard


                    Fuyuto, Kaori, & Ramsey-Musolf, Michael. Top down electroweak dipole operators.  Netherlands.  https://doi.org/10.1016/j.physletb.2018.04.022

Copy to clipboard


                    Fuyuto, Kaori, and Ramsey-Musolf, Michael. Fri .  
"Top down electroweak dipole operators".  Netherlands.  https://doi.org/10.1016/j.physletb.2018.04.022.

Copy to clipboard


                    
@article{osti_1437867,

  title        = {Top down electroweak dipole operators},

  author       = {Fuyuto, Kaori and Ramsey-Musolf, Michael},

  abstractNote = {We derive present constraints on, and prospective sensitivity to, the electric dipole moment (EDM) of the top quark (dt) implied by searches for the EDMs of the electron and nucleons. Above the electroweak scale v, the dt arises from two gauge invariant operators generated at a scale Λ >> that also mix with the light fermion EDMs under renormalization group evolution at two-loop order. Bounds on the EDMs of first generation fermion systems thus imply bounds on |dt| . Working in the leading log-squared approximation, we find that the present upper bound on |dt| is 1019 cm for TeV, except in regions of finely tuned cancellations that allow for to be up to fifty times larger. Future de and dn probes may yield an order of magnitude increase in dt sensitivity, while inclusion of a prospective proton EDM search may lead to an additional increase in reach.},

  doi          = {10.1016/j.physletb.2018.04.022},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 781,

  place        = {Netherlands},

  year         = {2018},

  month        = {6}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Publisher's Version of Record
https://doi.org/10.1016/j.physletb.2018.04.022

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 13 works

Citation information provided by
Web of Science

Figures / Tables:

Fig. 1. : The Barr-Zee diagrams induced by the dipole operator of the top quark. The circled cross mark denotes the top quark dipole operator, and the other wavy lines correspond to the gauge fields B or W ^A . While the upper two diagrams lead to the dipole operatormore »

All figures and tables (8 total)

Save / Share:

Export Metadata

Save to My Library

Figures / Tables found in this record:

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

Similar Records in DOE PAGES and OSTI.GOV collections:

Electric dipole moments of atoms, molecules, nuclei, and particles

Journal Article Chupp, T. E. ; Fierlinger, P. ; Ramsey-Musolf, M. J. ; ... - Reviews of Modern Physics

A permanent electric dipole moment (EDM) of a particle or system is a separation of charge along its angular momentum axis and is a direct signal of T violation and, assuming CPT symmetry, CP violation. For over 60 years EDMs have been studied, first as a signal of a parity-symmetry violation and then as a signal of CP violation that would clarify its role in nature and in theory. Contemporary motivations include the role that CP violation plays in explaining the cosmological matter-antimatter asymmetry and the search for new physics. Experiments on a variety of systems have become ever-more sensitive,more »« less
Cited by 154
https://doi.org/10.1103/revmodphys.91.015001

Full Text Available
Minimal four-family supergravity model

Journal Article Gunion, J F ; McKay, D W ; Pois, H - Physical Review, D

We investigate minimal four-family MSSM supergravity theories containing an additional general ({ital t}{prime},{ital b}{prime},{tau}{prime},{nu}{prime}) of heavy fermions along with their superpartners. We constrain the models by demanding gauge coupling constant unification at high energy scales, perturbative values for all Yukawa couplings for energy scales up to the grand-unification scale, radiative electroweak (EW) symmetry breaking via renormalization group evolution down from the grand-unification scale, a neutral LSP, and consistency with constraints from direct searches for new particles and precision electroweak data. The perturbative constraints imply a rather light fourth-family quark and lepton spectrum, and tan {beta}{approx_lt}3. The lightest {ital CP}-even Higgsmore »« less
https://doi.org/10.1103/PhysRevD.53.1616
Electroweak breaking and the {mu} problem in supergravity models with an additional U(1)

Journal Article Cvetic, M ; Demir, D A ; Espinosa, J R ; ... - Physical Review, D

We consider electroweak symmetry breaking in supersymmetric models with an extra nonanomalous U(1){sup {prime}} gauge symmetry and an extra standard-model singlet scalar S. For appropriate charges the U(1){sup {prime}} forbids an elementary {mu} term, but an effective {mu} is generated by the VEV of S, leading to a natural solution to the {mu} problem. There are a variety of scenarios leading to acceptably small Z-Z{sup {prime}} mixing and other phenomenological consequences, all of which involve some but not excessive fine-tuning. One class, driven by a large trilinear soft supersymmetry-breaking term, implies small mixing, a light Z{sup {prime}} (e.g., 200 GeV),more »« less
https://doi.org/10.1103/PhysRevD.56.2861
Left-right symmetry and electric dipole moments. A global analysis

Journal Article Ramsey-Musolf, Michael J. ; Vasquez, Juan Carlos - Physics Letters B

We perform a global fit using results of searches for electric dipole moments (EDM) of diamagnetic systems within the context of the minimal left-right symmetric model. In this way, we disentangle the new “left-right” electroweak and θ¯ contributions that cannot be separated using a single EDM system. Although the fit is done for a specific model, the approach can be applied to any particle physics model. Finally, we revisit the constraint on the D coefficient in β-decay and find that current EDM bounds do not preclude observation of this T-violating effect in a possible next generation β-decay experiment.
https://doi.org/10.1016/j.physletb.2021.136136
Electroweak baryogenesis, electric dipole moments, and Higgs diphoton decays

Journal Article Chao, Wei ; Ramsey-Musolf, Michael J. - Journal of High Energy Physics (Online)

Here, we study the viability of electroweak baryogenesis in a two Higgs doublet model scenario augmented by vector-like, electroweakly interacting fermions. Considering a limited, but illustrative region of the model parameter space, we obtain the observed cosmic baryon asymmetry while satisfying present constraints from the non-observation of the permanent electric dipole moment (EDM) of the electron and the combined ATLAS and CMS result for the Higgs boson diphoton decay rate. The observation of a non-zero electron EDM in a next generation experiment and/or the observation of an excess (over the Standard Model) of Higgs to diphoton events with the 14more »« less
Cited by 15
https://doi.org/10.1007/JHEP10(2014)180

Full Text Available

Similar Records