How natural is a small \barθin left-right SUSY models ?

Details How natural is a small \barθin left-right SUSY models ? How natural is a small \barθin left-right SUSY models ?

2001-05-25

arxiv.org/abs/hep-ph/0105270v2

Phys.Rev. D65 (2002) 056002

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, latex, 1 figure, references added

Scientific paper

10.1103/PhysRevD.65.056002

In the world without an axion the smallness of $\bar\theta$ may be achieved due to a spontaneously broken discrete left-right symmetry. We analyze the radiatively induced \bar\theta in the context of generic left-right symmetric SUSY models without assuming flavor degeneracy in the squark sector. Left-right symmetry allows to keep \bar\theta within its present bound only if the inter-generational mass splitting in the squark sector at the scale of the left-right symmetry breaking is smaller than 0.5%. We also consider the naturalness of m_u=0 solution to the strong CP problem in the context of horizontal flavor symmetries. A strong bound on the combination of the horizontal charges in the Up quark sector is found in this case.

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