Updating the neutron electric dipole moment in a fourth generation standard model
Journal
Physical Review D - Particles, Fields, Gravitation and Cosmology
Journal Volume
84
Journal Issue
9
Date Issued
2011
Author(s)
Abstract
A fourth generation of quarks, if it exists, may provide sufficient CP violation for the baryon asymmetry of the Universe. We estimate the neutron electric dipole moment in the presence of a fourth generation and find it would be dominated by the strange quark chromoelectric dipole moment, assuming it does not get wiped out by a Peccei-Quinn symmetry. Both the three electroweak loop and the two-loop electroweak/one-loop gluonic contributions are considered. With mb′, mt′ at 500 GeV or so that can be covered at the LHC, and with a Jarlskog CP violation factor that is consistent with hints of New Physics in b→s transitions, the neutron electric dipole moment is found around 10-31ecm, still far below the 10-28ecm reach of the new experiments being planned or under construction. © 2011 American Physical Society.
Type
journal article