Implications of baryon asymmetry for the electric dipole moment of the neutron

Details Implications of baryon asymmetry for the electric dipole moment of the neutron Implications of baryon asymmetry for the electric dipole moment of the neutron

1997-06-09

arxiv.org/abs/hep-ph/9706287v1

Prog.Theor.Phys. 98 (1997) 1325-1332

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 2 Postscript figures

Scientific paper

10.1143/PTP.98.1325

We study baryogenesis at the electroweak phase transition of the universe within the framework of the supersymmetric standard model (SSM) based on N=1 supergravity. This model contains a new source of CP violation in the mass-squared matrices for squarks, which could enable $t$ squarks to mediate the charge transport mechanism for generating baryon asymmetry. The same CP-violating source also induces the electric dipole moment (EDM) of the neutron at the one-loop level. If the new CP-violating phase is not suppressed, it is shown, the $t$-squark transport can lead to baryon asymmetry consistent with its observed value within reasonable ranges of SSM parameters. For these parameter ranges the magnitude of the neutron EDM is predicted to be not much smaller than its present experimental upper bound.

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