Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-09-29
Phys.Rev. D55 (1997) 1611-1622
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, REVTEX.
Scientific paper
10.1103/PhysRevD.55.1611
By using relations derived from renormalization group equations (RGEs), we find that strong indirect constraints can be placed on the top squark mixing phase in At from the electric dipole moment of the neutron (dn). Since mtop is large, any GUT-scale phase in At feeds into other weak scale phases through RGEs, which in turn contribute to dn. Thus CP-violating effects due to a weak-scale At are strongly constrained. We find that |Im At(mz)| must be smaller than or of order |Im B(mz)|, making the electric dipole moment of the top quark unobservably small in most models. Quantitative estimates of the contributions to dn from Au, Ad and B show that substantial fine-tuning is still required to satisfy the experimental bound on dn. While the low energy phases of the A's are not as strongly constrained as the phase of B(mz), we note that the phase of a universal A(GUT) induces large contributions in the phase of B(mz) through RGEs, and is thus still strongly constrained in most models with squark masses below a TeV.
Garisto Robert
Wells James Daniel
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