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

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 $1.8\times 10^{-26}$ 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.

Comments: The first two authors are equally contributed