Quark mass hierarchy and flavor mixing puzzles
Abstract
The fact that quarks of the same electric charge possess a mass hierarchy is a big puzzle in particle physics, and it must be highly correlated with the hierarchy of quark flavor mixing. This chapter is intended to provide a brief description of some important issues regarding quark masses, flavor mixing and CP-violation. A comparison between the salient features of quark and lepton flavor mixing structures is also made.
This article will also appear in "50 Years of Quarks," edited by H. Fritzsch and M. Gell-Mann (World Scientific, 2015).
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