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i want to find the lowest order strong interaction feynman diagram for the following process:

[tex]\Sigma^{++}_c \rightarrow \Lambda^+_c \pi^+[/tex]

the quark composition is:

[tex] \Sigma^{++}_c = (c u u) \ \Lambda^+_c = (c u d). \pi^+ =( \bar{d} u ) [/tex]

an image of a correct process is attached .

my question is: why can't the C quark be the one emitting the gluon?

my initial thought was Isospin conservation, as C doesn't carry isospin and the [tex] d \bar{d}[/tex] pair may have a [tex] I = 1 [/tex]. but the pair may also have a [tex] I=0 [/tex].

thanks for any help

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# Feynman diagram for a strong interaction decay

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