Supersymmetry and the Nelson-Barr Mechanism

Details Supersymmetry and the Nelson-Barr Mechanism Supersymmetry and the Nelson-Barr Mechanism

1993-03-24

arxiv.org/abs/hep-ph/9303296v2

Phys.Rev.D48:2214-2223,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 3 figures, phyzzx format; minor adjustments made

Scientific paper

10.1103/PhysRevD.48.2214

One possible solution to the strong CP problem is that CP is an exact symmetry, spontaneously broken at some scale. Some years ago, Nelson and Barr suggested a mechanism for obtaining $\theta=0$ at tree level in this framework, and showed that radiative corrections were small in some non-supersymmetric models. Further investigations suggested that the same could be true in supersymmetric theories. In this note, we show that these analyses assumed an extraordinarily high degree of degeneracy among squark masses and among other supersymmetry breaking parameters. We argue, using naturalness as well as expectations from string theory, that this is not very plausible.

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