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 $\Lambda \gg v$ 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 $|d_t|$. Working in the leading log-squared approximation, we find that the present upper bound on $|d_t|$ is roughly $10^{-19}$ $e$ cm for $\Lambda =1$ TeV, except in regions of finely tuned cancellations that allow for $|d_t|$ 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.

7 pages, 6 figures

References in corpus (3)

• Pinning down top dipole moments with ultra-boosted tops
• Bounding the top and bottom electric dipole moments from neutron experimental data
• Top Quark Anomalous Electromagnetic Couplings in Photon-Photon Scattering at the LHC

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• Indirect Signs of the Peccei-Quinn Mechanism
• Constraining New Physics with Single Top production at LHC
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• Sensitivity measuring expected on the electromagnetic anomalous couplings in the $t\bar{t}\gamma$ vertex at the FCC-he
• Top quark effective couplings from top-pair tagged photoproduction in $p{e}^{-}$ collisions
• Model-independent sensitivity estimates for the electromagnetic dipole moments of the top quark at the Large Hadron Collider and beyond
• Constraining EDM and MDM lepton dimension five interactions in the electroweak sector