Top down electroweak dipole operators
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≫v that also m...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2018-06-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S037026931830306X |
| _version_ | 1818346759861043200 |
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| author | Kaori Fuyuto Michael Ramsey-Musolf |
| author_facet | Kaori Fuyuto Michael Ramsey-Musolf |
| author_sort | Kaori Fuyuto |
| collection | DOAJ |
| description | 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≫v 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 10−19e cm for Λ=1 TeV, except in regions of finely tuned cancellations that allow for |dt| 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. |
| first_indexed | 2024-12-13T17:23:23Z |
| format | Article |
| id | doaj.art-3e200cbc153648cbaa75884b1b7d91c3 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-12-13T17:23:23Z |
| publishDate | 2018-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-3e200cbc153648cbaa75884b1b7d91c32022-12-21T23:37:14ZengElsevierPhysics Letters B0370-26932018-06-01781492498Top down electroweak dipole operatorsKaori Fuyuto0Michael Ramsey-Musolf1Amherst Center for Fundamental Interactions, Department of Physics, University of Massachusetts Amherst, MA 01003, USA; Corresponding author.Amherst Center for Fundamental Interactions, Department of Physics, University of Massachusetts Amherst, MA 01003, USA; Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125 USAWe 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≫v 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 10−19e cm for Λ=1 TeV, except in regions of finely tuned cancellations that allow for |dt| 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.http://www.sciencedirect.com/science/article/pii/S037026931830306X |
| spellingShingle | Kaori Fuyuto Michael Ramsey-Musolf Top down electroweak dipole operators Physics Letters B |
| title | Top down electroweak dipole operators |
| title_full | Top down electroweak dipole operators |
| title_fullStr | Top down electroweak dipole operators |
| title_full_unstemmed | Top down electroweak dipole operators |
| title_short | Top down electroweak dipole operators |
| title_sort | top down electroweak dipole operators |
| url | http://www.sciencedirect.com/science/article/pii/S037026931830306X |
| work_keys_str_mv | AT kaorifuyuto topdownelectroweakdipoleoperators AT michaelramseymusolf topdownelectroweakdipoleoperators |