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Explaining Why the u and d Quark Masses are Similar

S. M. Barr, I. Dorsner

hep-pharXiv:hep-ph/0305090

Abstract

An approach is suggested for modeling quark and lepton masses and mixing in the context of grand unified theories that explains the curious fact that mu ~ md even though mt >> mb. The structure of the quark mass matrices is such as to allow a non-Peccei-Quinn solution of the Strong CP Problem.

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