Some new regularities found in the pseudoscalar meson octet are reported. They invite to reconsider models where elementary fermions and composite QCD open strings can be grouped in common supermultiplets.

Dedication This dissertation is dedicated to my parents, my husband Liwen and my son Ethan. They have always been there for me. Their endless love and support kept me going for the whole idea of " Ph. D. " v Acknowledgements

1. These notes are the first half of the contents of the course given by the second author at the Bachelier Seminar (February 8-15-22 2008) at IHP. They also correspond to topics studied by the first author for her Ph.D.thesis. 2. Comments are welcome and may be addressed to :

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