We investigate the mean value of the first moment of primitive quartic L-functions over Fq (T) in the non-Kummer setting. Specifically, we study the sum equation* ⏦ ₑ₈₌₈ₓ₈ₕ₄\ ₐₔ₀ₑₓ₈₂\\ ⏦ℂ ₑ₈₌₈ₓ₈ₕ₄\\ ₆₄₍ₔₒ (⏦) =₆Lq (12, χ), equation* where Lq (s, χ) denotes the L-function associated with primitive quartic character χ. Using double Dirichlet series, we derive an error term of size q^ (3{5+) g}.
Ziwei Hong (Sat,) studied this question.
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