Bounding the top and bottom electric dipole moments from neutron experimental data

TL;DR

This paper derives upper bounds on the electric dipole moments of top and bottom quarks using neutron EDM experimental data, providing constraints on new physics effects involving heavy quarks.

Contribution

It introduces a method to constrain heavy quark EDMs through neutron EDM measurements, offering new bounds on top and bottom quark dipole moments.

Findings

Upper bound on top quark EDM: |d_t|<3.06×10^{-15} e-cm

Upper bound on bottom quark EDM: |d_b|<1.22×10^{-13} e-cm

Constraints inform new physics models involving heavy quarks.

Abstract

Heavy quarks, namely, the top and bottom quarks, may show great sensitiveness to new physics effects. In particular, they might have unusually large electric dipole moments. This possibility is analyzed via the corresponding one-loop correction to the neutron electric dipole moment, $d_n$. The current experimental limit on $d_n$ is used then to derive the uppers bounds $|d_t|<3.06\times 10^{-15}$ e-cm, $|d_b|<1.22\times 10^{-13}$ e-cm.