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Can anybody please explain what is meant by the term "gauge singlet"?

To be more specific, I got the term in a discussion on wess-zumino lagrangian where the superpotential contains the term:[tex]a_i \phi_i [/tex]. The author claims that in order the theory to be gauge invariant and invariant under susy, the fields present in this term must be gauge singlets. I do not understand this at all. (The fields mentioned are left handed chiral superfields.)

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# What is meant by the term gauge singlet ?

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