The charge conjugation quantum number in multiquark systems

Abstract

We discuss the charge conjugation quantum number for tetraquarks or meson-meson molecules, seen as possible interpretations of the newly found $XYZ$ charmonium-like resonances.

7 pages, 1 figure, based on a talk given at the Joint Meeting Heidelberg-Liege-Paris-Wroclaw (HLPW08): Three Days of Strong Interactions and Astrophysics, Spa, March 6-8, 2008, Eqs. (18)-(25) corrected, text slightly polished, conclusions unchanged

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