Top down electroweak dipole operators

Fuyuto, Kaori; Ramsey-Musolf, Michael

doi:10.1016/j.physletb.2018.04.022

Title: Top down electroweak dipole operators

Journal Article · 13 April 2018 · Physics Letters B

DOI: https://doi.org/10.1016/j.physletb.2018.04.022 · OSTI ID:1437867

Fuyuto, Kaori ^[1]; Ramsey-Musolf, Michael ^[2]

Univ. of Massachusetts, Amherst, MA (United States). Amherst Center for Fundamental Interactions, Dept. of Physics
Univ. of Massachusetts, Amherst, MA (United States). Amherst Center for Fundamental Interactions, Dept. of Physics; California Inst. of Technology (CalTech), Pasadena, CA (United States). Kellogg Radiation Lab.

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.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0011095

OSTI ID:: 1437867

Alternate ID(s):: OSTI ID: 1499287

Journal Information:: Physics Letters B, Vol. 781, Issue C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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