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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 (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.

Authors:
;
Publication Date:
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. https://doi.org/10.1016/j.physletb.2018.04.022.
Fuyuto, Kaori, & Ramsey-Musolf, Michael. Top down electroweak dipole operators. Netherlands. https://doi.org/10.1016/j.physletb.2018.04.022
Fuyuto, Kaori, and Ramsey-Musolf, Michael. Fri . "Top down electroweak dipole operators". Netherlands. https://doi.org/10.1016/j.physletb.2018.04.022.
@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}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.physletb.2018.04.022

Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

Figures / Tables:

Fig. 1. 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 » of the up quark, the lower diagrams yield those of the electron and down quark. The “+ · · · ” indicate additional topologies that contribute to the light fermion EDMs.« less

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Works referencing / citing this record:

Electric dipole moment of Hg 199 atom from P , C P -odd electron-nucleon interaction
journal, April 2019


Electric dipole moments of atoms, molecules, nuclei, and particles
journal, January 2019


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