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forCode (Text):$P=(-1)^L$,

$C=(-1)^{L+S}$

?Code (Text):$q \bar q$

And $P=?$, $C=?$ for tetraquarks

?Code (Text):

$[(q_1 q_2)_{S_1}(\bar q_1 \bar q_2)_{S_2}$

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# How to prove P=(-1)^L, c=(-1)^{L+S} for q \bar q

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