Solution to the Strong CP Problem: Supersymmetry with Parity

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Abstract
There is a natural solution to the strong CP problem in the Minimal Supersymmetric Standard Model if it arises from a parity symmetric theory which is spontaneously broken to MSSM at Planck, GUT or intermediate scales. The strong CP phase is zero at the tree level and is not induced to two loops. The SUSY phase problems are also solved. The universal soft SUSY breaking parameters A, B, \mu, m_{1/2} are all automatically real and the only additional CP violation effects of the low-energy MSSM are characterized by a Hermitian squark mass matrix whose phases depend on the CKM phase. Cases with non-universal boundary conditions are also considered.

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