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M. Srednicki says in the book "Quantum Field Theory" on page 211 that:

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I would really appreciate if someone could introduce me a good reference for understanding the irreducible decomposition of representations like $2\otimes 2=1_A \oplus 3_S$. Where can I find and learn them well?

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    $\begingroup$ This is covered in e.g. Georgi's 'Lie Algebras in Particle Physics'. $\endgroup$
    – Martin C.
    Commented Nov 6 at 14:31
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    $\begingroup$ Here, but you learned about it in basic QM addition of spins: you are simply writing it in representation dimensionality formulas, instead of spin... $\endgroup$
    – Cosmas Zachos
    Commented Nov 6 at 14:37
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    $\begingroup$ Linked. $\endgroup$
    – Cosmas Zachos
    Commented Nov 6 at 14:50

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