How natural is a small θ̄ in left-right supersymmetry models?

Cherif Hamzaoui, Maxim Pospelov

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


In a world without an axion, the smallness of θ̄ may be achieved due to a spontaneously broken discrete left-right symmetry. We analyze the radiatively induced θ̄ in the context of generic left-right symmetric supersymmetry models without assuming flavor degeneracy in the squark sector. Left-right symmetry allows us to keep θ̄within its present bound only if the intergenerational 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 the mu = 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.

Original languageEnglish (US)
Article number056002
JournalPhysical Review D
Issue number5
StatePublished - 2002


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