The Strong Charge+Parity (CP) problem is considered one of the major unsolved problems in the field of elementary particle physics. To understand the theories, you need to first be able to understand elementary particle physics and this is not an easy field to describe or understand. One fairly well-known theory to try to solve this problem is called the Peccei–Quinn theory, originated by Roberto Peccei and Helen Quinn.
There are other theories, one proposed by S.D.H. Hsu, Institute of Theoretical Science, University of Oregon, Eugene and F. Sannino, The Niels Bohr Institute, in Copenhagen, Denmark. I cannot even begin to explain the theories, I just know they exist.
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