Electric dipole moments of neutron and heavy quarks c, t in CP violating $U(1)_X$SSM

TL;DR

This paper investigates the electric dipole moments of neutron and heavy quarks in a CP-violating supersymmetric $U(1)_X$ extension of the standard model, considering one-loop and Weinberg operator contributions, and finds that neutron EDMs can be within experimental bounds.

Contribution

The study introduces a detailed analysis of EDMs in the $U(1)_X$SSM, including new CPV phases and their effects on EDM predictions, expanding beyond the minimal supersymmetric standard model.

Findings

Neutron EDM can be below experimental upper bound without small CPV phases.

Heavy quark EDMs c and t can reach $10^{-24}$ and $10^{-22}$ e$ullet$cm respectively.

$U(1)_X$SSM allows sizable EDMs consistent with current constraints.

Abstract

We study and analyze the electric dipole moments (EDMs) of neutron and heavy quarks c, t in a CP-violating (CPV) supersymmetric U(1) extension of the standard model called $U(1)_X$SSM, whose local gauge group is $U(1)_X\times SU(3)_C\times SU(2)_L \times U(1)_Y$. The contributions from the one loop diagrams and the Weinberg operators are taken into account with the new introduced CPV phases beyond the minimum supersymmetric standard model(MSSM) being non-zero. Our numerical results show that in $U(1)_X$SSM the neutron EDM can be smaller than its experimental upper bound $1.8\times10^{-26}$ e$\cdot$cm without a small CPV phase. The magnitudes of EDMs of heavy quarks c and t can reach $10^{-24}$ e$\cdot$cm. and $10^{-22}$ e$\cdot$cm respectively. This is favorable to the study of CPV.