Chromoelectric Dipole Moments of Quarks in MSSM Extensions

TL;DR

This paper investigates how extending the MSSM with vectorlike quarks affects the chromoelectric dipole moments of quarks and the neutron, highlighting potential observable effects in future experiments.

Contribution

It introduces the impact of vectorlike quarks on quark EDMs within the MSSM, including detailed analysis of various exchange contributions and interference effects.

Findings

Vectorlike quarks significantly modify quark EDMs.

Interference effects provide a new probe of vectorlike quark sector.

Future neutron EDM measurements could reveal signs of new physics.

Abstract

An analysis is given of the chromoelectric dipole moment of quarks and of the neutron in an MSSM extension where the matter sector contains an extra vectorlike generation of quarks and mirror quarks. The analysis includes contributions to the CEDM from the exchange of the $W$ and the $Z$ bosons, from the exchange of charginos and neutralinos and the gluino. Their contribution to the EDM of quarks is investigated. The interference between the MSSM sector and the new sector with vectorlike quarks is investigated. It is shown that inclusion of the vectorlike quarks can modify the quark EDMs in a significant way. Further, this interference also provides a probe of the vectorlike quark sector. These results are of interest as in the future measurements on the neutron EDM could see an improvement up to two orders of magnitude over the current experimental limits and provide a window to new physics beyond the standard model.