Is there a meson with one charm antiquark, $\bar{c}$, so that $C=-1$? Can they exist?
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Yes. The lightest examples are the D mesons which have a single $c$ or $\bar c$.
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$\begingroup$ DJones , + They exists in resonances, before decaying . see this answer physics.stackexchange.com/questions/64862/… $\endgroup$– anna vCommented Apr 17, 2020 at 4:13